Informational Text Analysis

Determining the Central Idea means finding the most important idea in a nonfiction text.

A nonfiction text gives real facts and true information. It may teach about animals, weather, places, people, or how something works.

The topic is what the text is mostly about. The central idea is the big point the author wants you to learn about that topic.

Think of it this way:

• Topic = the subject
• Central idea = the big message about the subject

For example, if a text is about bees, the topic is bees. But the central idea might be bees help plants grow by moving pollen from flower to flower.

That means the central idea is more than just one word. It is a full idea.

How can you find the central idea?

1. Ask: What is this text mostly about?
2. Look for facts that repeat. Authors often give several details about the same big idea.
3. Think: What do all the details teach me?
4. Say the big idea in a full sentence.

Helpful clue: Small details support the central idea. They are like puzzle pieces. When you put them together, they show the big picture.

Look at this:

• Detail 1: Frogs start life as eggs.
• Detail 2: Tadpoles hatch from the eggs.
• Detail 3: Tadpoles grow legs and become frogs.

These details are all about the same thing. The central idea is: Frogs grow and change as they live.

Central idea is not the same as one detail.

A detail is one small fact. The central idea includes the whole text or most of it.

Read this example:

Pandas eat bamboo. They spend many hours each day chewing it. Bamboo gives pandas the food they need.

One detail is: Pandas eat bamboo.

The central idea is: Bamboo is an important food for pandas.

See the difference? The central idea brings the details together into one big thought.

Words that can help you notice the central idea

Sometimes authors repeat words or ideas. They may also put the main idea at the beginning or end of a paragraph.

Watch for:

• the same subject named again and again
• facts that match one big thought
• a title that gives a clue
• pictures and captions that match the text

Ask yourself these questions while reading:

• Who or what is this about?
• What is the author teaching me about it?
• Which idea fits most of the details?

Worked Example 1

Leaves can be green in spring and summer. In fall, some leaves change to red, yellow, or orange. This happens when the weather gets cooler.

Step 1: What is the topic? Leaves.

Step 2: What details do we notice?

• Leaves are green in spring and summer.
• In fall, some leaves change colors.
• Cooler weather is part of the change.

Step 3: What is the central idea?

Leaves change color when seasons change.

This is the big idea because all the details fit it.

Worked Example 2

Firefighters help keep people safe. They put out fires. They also help in car accidents and other emergencies. Firefighters work as a team to help their community.

Topic: Firefighters.

Important details:

• They keep people safe.
• They put out fires.
• They help in emergencies.
• They work as a team.

Central idea: Firefighters help people stay safe in many ways.

This is better than saying only Firefighters put out fires, because the text tells more than just that one detail.

Worked Example 3

Penguins have feathers, but they cannot fly. Instead, they use their wings to help them swim. Penguins are strong swimmers and spend much of their time in the water.

Topic: Penguins.

Details:

• Penguins have feathers.
• They cannot fly.
• They use their wings to swim.
• They spend a lot of time in water.

Central idea: Penguins are birds that are built for swimming instead of flying.

This central idea includes the most important facts from the whole passage.

Worked Example 4

Recycling helps the Earth. People can recycle paper, plastic, glass, and metal. Recycling turns old items into new things. This can help reduce waste.

Topic: Recycling.

Details:

• Recycling helps the Earth.
• Many materials can be recycled.
• Old items can become new things.
• Recycling reduces waste.

Central idea: Recycling is a helpful way to reduce waste and take care of the Earth.

How to tell if your answer is a good central idea

Check your answer with these ideas:

• Is it about the whole text, not just one part?
• Is it in a full sentence?
• Do most of the details fit it?

If the answer is yes, you probably found the central idea.

Let’s practice thinking

Read this short text:

Dogs need care every day. They need food and clean water. They also need exercise and love from their families.

You might think the topic is dogs. That is correct.

But the central idea is bigger: Dogs need daily care to stay healthy and happy.

Why? Because all the details are about what dogs need each day.

A smart reading tip

After reading, try saying: “This text is mostly about ___, and the author wants me to know ___.”

For example:

• This text is mostly about butterflies, and the author wants me to know they change as they grow.
• This text is mostly about rain, and the author wants me to know it helps plants and animals.

This sentence frame can help you move from the topic to the central idea.

Summary

The topic tells what a nonfiction text is about. The central idea tells the most important thing the author wants you to learn about that topic.

To find the central idea, look for details that go together, think about the big point they show, and say that big point in a full sentence.

When you do this, you understand the text better and become a stronger reader.

Navigating Text Features

When we read an informational book, we do not always start at page 1 and read every word. Sometimes we need to find information quickly. That is where text features help us.

Text features are parts of a nonfiction text that help us understand the book and locate facts. They are like helpful tools.

In this lesson, you will learn how to use these text features:

• table of contents
• headings
• bold words
• glossary
• index

1. Table of Contents

A table of contents is usually near the front of a book. It shows the big parts, or chapters, of the book. It also tells the page number where each part begins.

If you want to learn about one topic, the table of contents helps you know where to turn.

Example table of contents:

• What Is Weather? ........ 3
• Rainy Days ........ 6
• Snow and Ice ........ 10
• Storms ........ 14

If you want to read about storms, you would turn to page 14.

2. Headings

Headings are titles for sections of the text. They tell what that part is mostly about.

When you look at headings, you can decide if a section has the information you need.

For example, in a book about plants, you might see these headings:

• Parts of a Plant
• How Plants Grow
• Plants Need Water and Sunlight

If you want to know what plants need, the heading Plants Need Water and Sunlight will help you.

3. Bold Words

Bold words are darker and thicker than other words. Authors make some words bold to show they are important.

Bold words are often new words that the reader should learn.

Example:

The frog is an amphibian. It can live on land and in water.

Here, amphibian is important, so it is in bold.

4. Glossary

A glossary is usually near the back of a book. It gives meanings of important words from the text.

If you see a bold word and do not know what it means, you can look in the glossary.

Example glossary:

• amphibian - an animal that can live on land and in water
• habitat - the place where a plant or animal lives

If you do not know the word habitat, the glossary can help.

5. Index

An index is usually at the back of a book. It is a list of topics and the page numbers where you can find them.

The index is usually in alphabetical order. That means words are listed by letter order: A, B, C, and so on.

Example index:

• eggs, 4, 7
• feathers, 5
• nests, 2, 8
• wings, 3, 5

If you want to find information about nests, you can look in the index and turn to page 2 or page 8.

How These Features Help You

Text features help you become a smart reader. You do not have to guess where information is. You can use the feature that matches your job.

• Use the table of contents to find a chapter or big part.
• Use headings to find the right section on a page.
• Use bold words to notice important words.
• Use the glossary to learn what a word means.
• Use the index to find pages about a topic.

Worked Example 1: Using a Table of Contents

You are reading a book about space. The table of contents says:

• The Sun ........ 2
• The Moon ........ 6
• Planets ........ 10
• Stars ........ 15

Question: Where should you turn to read about planets?

Think: Find the word Planets in the table of contents.

Answer: Turn to page 10.

Worked Example 2: Using a Heading

You see these headings in a book about animals:

• Where Animals Live
• What Animals Eat
• How Animals Stay Safe

Question: Which heading should you read if you want to learn about animal homes?

Think: Animal homes are where animals live.

Answer: Read Where Animals Live.

Worked Example 3: Using a Glossary

You read this sentence:

A camel stores fat in its hump.

You do not know the word hump.

Question: What text feature should you use?

Think: The word is bold, and you need its meaning.

Answer: Use the glossary.

Worked Example 4: Using an Index

You want to find information about bees in an insect book. The index says:

• ants, 3, 4
• bees, 6, 9
• butterflies, 10
• spiders, 12

Question: What pages should you check?

Think: Find the topic bees in the index.

Answer: Check pages 6 and 9.

Tips for Navigating Text Features

1. First, think about what information you need.
2. If you need a chapter, check the table of contents.
3. If you need a part on one page, look at the headings.
4. If you see a dark, important word, notice the bold text.
5. If you need a word meaning, use the glossary.
6. If you need a topic and page numbers, use the index.

Let’s Remember

Nonfiction books are full of helpful clues. Text features help readers find facts, learn new words, and understand the book better.

When you know how to use the table of contents, headings, bold words, glossary, and index, you can find information quickly and easily.

Key Details Extraction means finding the important facts in a nonfiction text.

When we read informational text, we learn about real things. A text may teach us about animals, weather, plants, people, or places. The main topic tells what the whole text is mostly about. Key details are the important facts that help explain that topic.

Good readers ask, “What facts help me understand the topic?” Those facts are the key details.

Example: If a text is about apples, the key details might tell us what color apples can be, where apples grow, and how people eat them.

Key details are not just any words. They are the facts that matter most.

• The topic is what the text is about.
• The key details are the important facts about the topic.

Let’s learn how to find key details.

1. Read or listen to the title. The title can help you know the topic.
2. Think: “What is this mostly about?” That helps you find the main topic.
3. Look for important facts. Ask, “What facts teach me more about the topic?”
4. Tell the facts back. You can point to them in the text or say them aloud.

Some nonfiction pages also have special parts, like:

• Headings
• Pictures
• Labels
• Captions
• Bold words

These parts can help you find key details too.

Here are some question words that help:

• Who?
• What?
• Where?
• When?
• Why?
• How?

If a sentence answers one of these questions about the topic, it may be a key detail.

Remember: A key detail should help support the main topic.

If the topic is dogs, a key detail might be, “Dogs need food and water.” That fact teaches us something important about dogs.

A sentence like, “I like dogs,” is not a strong key detail in an informational text. It is an opinion, not a fact.

Let’s look at some worked examples.

Worked Example 1

Text: “Birds have feathers. Birds have wings. Many birds can fly.”

Step 1: Find the topic. This text is mostly about birds.

Step 2: Find the key details.

• Birds have feathers.
• Birds have wings.
• Many birds can fly.

These are all key details because they tell important facts about birds.

Worked Example 2

Text: “Frogs live near ponds. Frogs can jump. Frogs eat bugs.”

Step 1: Find the topic. The topic is frogs.

Step 2: Find the key details.

• Frogs live near ponds.
• Frogs can jump.
• Frogs eat bugs.

Each sentence gives a fact that helps explain the topic.

Worked Example 3

Text: “Plants need water and sunlight to grow. Roots hold the plant in the ground. Leaves can make food for the plant.”

Step 1: Find the topic. The topic is plants.

Step 2: Ask what facts help explain plants.

• Plants need water and sunlight to grow.
• Roots hold the plant in the ground.
• Leaves can make food for the plant.

These details are important because they teach how plants live and grow.

Worked Example 4

Text with a heading:

Baby Sea Turtles

“Baby sea turtles hatch from eggs. They move toward the ocean. Many baby sea turtles travel at night.”

Step 1: Use the heading. The heading tells us the topic is baby sea turtles.

Step 2: Find the key details.

• Baby sea turtles hatch from eggs.
• They move toward the ocean.
• Many baby sea turtles travel at night.

These details support the topic because they tell real facts about baby sea turtles.

Now let’s practice how to tell if a detail is important.

If the text is about rain, which sentence is a key detail?

• Rain falls from clouds.
• I saw rain from my window.

The key detail is “Rain falls from clouds.” It is a fact about rain.

The sentence “I saw rain from my window” is about one person’s experience. It does not explain the topic as well.

Here is another one.

If the text is about bees, which detail helps most?

• Bees collect pollen from flowers.
• Bees are cute.

The key detail is “Bees collect pollen from flowers.” That is an important fact.

Tips for finding key details:

• Look for facts, not opinions.
• Look for details that match the topic.
• Look for details that teach something important.
• Use headings, pictures, and captions for help.

When you answer a question about key details, it helps to go back to the text. Point to the words that gave you the answer.

You can say:

• “One key detail is...”
• “Another key detail is...”
• “The text says...”

This helps you show where your answer came from.

Let’s do one more short practice.

Text: “The sun is a star. It gives Earth light. It gives Earth heat.”

Topic: the sun

Key details:

• The sun is a star.
• It gives Earth light.
• It gives Earth heat.

All three details help explain the topic.

Summary

Key details are the important facts in a nonfiction text. They help explain the main topic. To find them, think about what the text is mostly about, then look for facts that teach more about that topic. Good readers use the text, headings, pictures, and captions to help them find strong key details.

Interpreting Graphic Features means reading the pictures and visual parts of a nonfiction text to learn more information.

In nonfiction, authors do not only use words. They also use graphic features to help readers understand facts. Graphic features include maps, charts, diagrams, timelines, and captioned photographs.

When you read a nonfiction page, do not skip the visuals. A graphic feature can tell you where, when, what, or how.

Common graphic features

• Map: shows where a place is
• Chart: shows information in an organized way
• Diagram: shows parts of something or how something works
• Timeline: shows events in time order
• Captioned photograph: a photo with words that explain the photo

How to read a graphic feature

1. Look carefully at the whole visual.
2. Read the title, labels, and caption.
3. Ask, “What is this showing me?”
4. Think about how it helps the words on the page.

1. Reading maps

A map helps you see location. It can show where an animal lives, where a river is, or where people travel.

Maps often have labels and symbols. A label names a place. A symbol is a small picture or mark that stands for something.

When you read a map, ask:

• What place is the map showing?
• What do the labels tell me?
• What can I learn about where things are?

Worked Example 1: Map

You are reading a page about penguins. There is a map with the label Antarctica. A caption says, “Penguins live in cold places in the Southern Hemisphere.”

Question: Where do penguins live?

Think: The map shows Antarctica. The caption says penguins live in cold places in the Southern Hemisphere.

Answer: Penguins live in cold places, including Antarctica.

The map helps the reader understand where penguins live.

2. Reading charts

A chart puts facts in rows, columns, or groups so they are easy to compare.

A chart can help you answer questions like:

• Which has more?
• Which has less?
• How are these things the same?
• How are these things different?

Worked Example 2: Chart

A class made a chart about favorite pets.

• Dogs: 8
• Cats: 5
• Fish: 2

Question: Which pet is the most popular?

Think: Compare the numbers. Dogs have 8, cats have 5, and fish have 2. Since $$8 > 5$$ and $$8 > 2$$, dogs have the greatest number.

Answer: Dogs are the most popular pet.

The chart helps the reader compare information quickly.

3. Reading diagrams

A diagram shows the parts of something or how something works.

For example, a plant diagram might label the roots, stem, leaves, and flower. The labels help the reader know each part.

When you read a diagram, ask:

• What object or thing is being shown?
• What parts are labeled?
• What does each part do?

Worked Example 3: Diagram

You see a diagram of a butterfly. The labels say wings, antennae, and body.

Question: Which part helps you know how the butterfly flies?

Think: A butterfly uses its wings to fly. The diagram labels that part.

Answer: The wings help you know how the butterfly flies.

The diagram helps the reader learn about the parts of a butterfly.

4. Reading timelines

A timeline shows events in the order they happened. It helps you understand when things happened.

A timeline may go from left to right or top to bottom. The first event comes first. The last event comes last.

When you read a timeline, ask:

• What happened first?
• What happened next?
• What happened last?

Worked Example 4: Timeline

A timeline shows how a chick grows:

• Day 1: Egg
• Day 10: Chick growing inside egg
• Day 21: Chick hatches

Question: What happens after the chick grows inside the egg?

Think: Look at the order on the timeline. After Day 10 comes Day 21.

Answer: The chick hatches.

The timeline helps the reader understand the order of events.

5. Reading captioned photographs

A photograph shows a real person, place, animal, or thing. A caption is a short sentence that tells more about the photo.

Sometimes the photo shows one thing, but the caption adds an important fact. You need both the picture and the caption to understand more.

When you read a captioned photograph, ask:

• What do I notice in the photo?
• What does the caption tell me?
• How do the photo and caption work together?

Example: A photo shows a bear near a river. The caption says, “This bear catches fish for food during the summer.”

From the photo, you see the bear by the river. From the caption, you learn why the bear is there: it is catching fish for food.

Why graphic features matter

Graphic features help readers understand nonfiction better. They can give facts that are not in the main sentences. They can also make tricky ideas easier to understand.

Sometimes the answer to a question is not in the paragraph. It may be in the map, chart, diagram, timeline, or caption.

Tips for answering questions about graphic features

• Look at the visual before answering.
• Read every label and caption.
• Use both the picture and the words.
• Think about whether the visual shows where, when, what, or how.
• Go back and check your answer.

Let’s practice thinking

If a map shows where whales swim, it helps you know where.

If a timeline shows the life of a frog, it helps you know when each stage happens.

If a diagram shows parts of a bike, it helps you know what parts it has.

If a captioned photo shows a firefighter at work, it helps you know what is happening.

Summary

Graphic features are important parts of nonfiction texts. They help readers learn facts by showing information in pictures and other visual ways.

Remember: a map shows where, a chart helps compare, a diagram shows parts, a timeline shows order in time, and a captioned photograph adds details to a picture.

Good readers use both the words and the graphic features to understand the whole text.

Chronological and Sequential Structure

Sometimes authors put ideas in a special order so readers can understand them better. Two important kinds of order are chronological order and sequential order.

Chronological order means events are told in the order they happen in time. This is often used in true stories about history, people, or real events.

Sequential order means ideas are told in the order of steps. This is often used when an author explains how to make something or how to do something.

Both structures help readers know what comes first, next, and last.

Why is this important?

When you know the order of events or steps, you can understand the text better. You can answer questions like:

• What happened first?
• What happened next?
• What happened last?
• Which step should come before another step?

1. Chronological Order: Time Order

In chronological order, the author tells about events from earlier to later. Think about a day at school. You arrive, then you learn, then you go home. That is time order.

Authors often use signal words to show time order.

• first
• next
• then
• after
• later
• before
• finally
• last
• in the morning
• that day

Example of chronological order:

"First, Maya woke up early. Next, she ate breakfast. Then, she walked to school. Finally, she got to her classroom."

This is chronological because it tells what Maya did in the order it happened during time.

2. Sequential Order: Step-by-Step Order

In sequential order, the author gives directions or explains steps. The order matters because each step helps with the next one.

Authors also use signal words for steps.

• first
• next
• then
• after that
• last
• step 1
• step 2
• how to

Example of sequential order:

"First, get a piece of paper. Next, fold it in half. Then, draw a heart. Last, color it red."

This is sequential because it gives directions in the order you should do them.

How are they alike?

• Both use order.
• Both help readers follow ideas.
• Both often use words like first, next, then, and last.

How are they different?

• Chronological order tells when things happened over time.
• Sequential order tells the steps to do something.

How to spot these text structures

1. Look for signal words like first, next, then, and finally.
2. Ask yourself, "Is this telling about events in time or steps to follow?"
3. If it tells real events in time, it is probably chronological.
4. If it gives directions or a process, it is probably sequential.

Worked Example 1: Easy

Read this passage:

"First, Ben put on his shoes. Next, he got his backpack. Then, he walked to the bus stop. Finally, the bus came."

Question: Is this chronological or sequential?

Answer: This is chronological.

Why? It tells what Ben did over time during his morning. These are events happening in time, not directions for the reader.

Worked Example 2: Easy-Middle

Read this passage:

"First, wash the apple. Next, cut it into slices. Then, put the slices on a plate. Last, eat your snack."

Question: Is this chronological or sequential?

Answer: This is sequential.

Why? It gives steps for how to prepare a snack. The reader should do the steps in this order.

Worked Example 3: Middle

Read this passage:

"In the spring, the class planted seeds. After a few days, tiny sprouts appeared. Later, the plants grew taller. Finally, the class picked vegetables from the garden."

Question 1: What text structure is used?

Answer: Chronological order.

Question 2: What happened after the class planted seeds?

Answer: Tiny sprouts appeared.

Why? The author is telling the events in time order, from planting to picking vegetables.

Worked Example 4: Challenge

Read this passage:

"How to make a paper hat: First, get one sheet of paper. Next, fold the top corners down. Then, fold the bottom flap up. After that, turn it over and fold the other flap. Finally, open the hat."

Question 1: What text structure is used?

Answer: Sequential order.

Question 2: What comes before opening the hat?

Answer: Turning it over and folding the other flap.

Why? This passage teaches steps in a process. Each step must come in the right order.

Tips for answering questions

• Circle or say the signal words.
• Think: time order or step-by-step?
• Retell the passage using words like first, next, then, and last.
• If you can put the events on a timeline, it may be chronological.
• If you can use the text as directions, it may be sequential.

Let’s practice thinking

If a passage says, "First the storm clouds came. Then rain fell. After that, the sun came out," the structure is chronological because it tells what happened over time.

If a passage says, "First pour the soil into the pot. Next place the seed inside. Then cover it with more soil," the structure is sequential because it gives steps to follow.

Summary

Chronological order tells events in the order they happen in time.

Sequential order tells steps in the order they should be done.

To figure out which one a text uses, look for clue words like first, next, then, and finally. Then ask yourself if the author is telling about events or giving directions.

Cause and Effect Relationships help us understand what happened and why it happened in nonfiction reading.

When we read about history, science, or how something works, we often see events connected together. One thing happens first, and then another thing happens because of it.

The cause is why something happens. The effect is what happens.

Think of it like this:

• Cause = the reason
• Effect = the result

For example, if it rains, the sidewalk gets wet.

• Cause: It rains.
• Effect: The sidewalk gets wet.

Cause and effect are important in informational texts. Informational texts teach us facts about the world. They may explain animals, weather, inventions, important people, or events from long ago.

When good readers look for cause and effect, they ask:

• What happened?
• Why did it happen?

Sometimes authors use clue words to show cause and effect. These words can help us find the connection.

• because
• so
• since
• therefore
• as a result
• if...then

Here is how to find cause and effect in a nonfiction sentence:

1. Read the sentence or paragraph carefully.
2. Look for what happened.
3. Ask why it happened.
4. Match the reason to the result.

Let’s learn with examples.

Worked Example 1

Sentence: The plant leaned toward the window because it needed sunlight.

First, ask: What happened? The plant leaned toward the window.

Next, ask: Why did it happen? It needed sunlight.

• Cause: The plant needed sunlight.
• Effect: The plant leaned toward the window.

This is a science example. The author is explaining why the plant moved that way.

Worked Example 2

Sentence: It snowed all night, so the roads were covered in snow in the morning.

What happened? The roads were covered in snow in the morning.

Why did it happen? It snowed all night.

• Cause: It snowed all night.
• Effect: The roads were covered in snow.

The clue word so helps show the effect.

Worked Example 3

Sentence: People built a bridge over the river so they could cross more easily.

This example is a little trickier because it tells about a human action.

What happened? People built a bridge over the river.

Why did they do it? They wanted to cross more easily.

• Cause: People wanted to cross the river more easily.
• Effect: They built a bridge.

In informational text, the cause is not always an accident or a weather event. Sometimes it is a need or a problem that leads to an action.

Worked Example 4

Paragraph: A long time ago, a dry season lasted for many months. Crops could not get enough water. As a result, many plants did not grow well.

Let’s think step by step.

What happened in the end? Many plants did not grow well.

Why did that happen? A dry season lasted for many months, and the crops could not get enough water.

• Cause: There was a long dry season, and crops did not get enough water.
• Effect: Many plants did not grow well.

This example shows that sometimes there can be more than one cause for one effect.

Sometimes one cause can also lead to more than one effect.

Example: The power went out during the storm. The lights turned off, and the refrigerator stopped running.

• Cause: The power went out during the storm.
• Effects: The lights turned off, and the refrigerator stopped running.

When you read nonfiction, it also helps to think about the author’s purpose. The author may want to explain why something in history happened, why something in science works, or why people made a choice.

For example:

• In a history text, an author may explain why settlers moved to a new place.
• In a science text, an author may explain why ice melts in the sun.
• In a technical text, an author may explain why pushing a button makes a machine start.

Finding cause and effect helps you understand the author’s ideas more clearly.

Here are some helpful tips:

• Look for clue words like because, so, and as a result.
• Ask, What happened?
• Ask, Why did it happen?
• Remember that the cause can come before or after the effect in a sentence.

Look at these two sentences:

• Because the baby birds were hungry, they chirped loudly.
• The baby birds chirped loudly because they were hungry.

Both sentences mean the same thing.

• Cause: The baby birds were hungry.
• Effect: The baby birds chirped loudly.

So, readers must think carefully. The cause is not always written first.

Let’s practice thinking about short nonfiction ideas:

• The class recycled paper, so less trash went into the garbage can.
• Cause: The class recycled paper.
• Effect: Less trash went into the garbage can.

• Since the robot’s battery was low, it moved slowly.
• Cause: The robot’s battery was low.
• Effect: It moved slowly.

• The ground shook, and a crack formed in the wall.
• Cause: The ground shook.
• Effect: A crack formed in the wall.

If you are not sure, try this sentence frame:

The effect happened because the cause happened.

Example: The wall cracked because the ground shook.

That sentence frame can help you check your thinking.

Summary

Cause and effect tell us how two things are connected.

The cause is why something happens. The effect is what happens.

In informational text, readers look for facts that show these connections in history, science, and how-to topics.

When you ask What happened? and Why did it happen?, you can find the cause-and-effect relationship more easily.

Compare and Contrast Structure

Sometimes an author wants to tell us how two things are alike and how they are different. When a text does this, it is using a compare and contrast structure.

Compare means to tell how things are alike.

Contrast means to tell how things are different.

Authors use this text structure in nonfiction to help readers learn about two or more topics at the same time. It helps us notice important details.

Why is this useful?

• It helps us understand a topic better.
• It helps us sort facts into groups.
• It helps us see what is the same and what is not the same.

Signal words are clue words that help us know a text is comparing and contrasting.

Here are some compare clue words:

• same
• both
• alike
• also
• too

Here are some contrast clue words:

• different
• but
• however
• instead
• only

When you read, look for these clue words. They can help you find the author’s ideas.

How to read a compare and contrast text

1. Read the title and topic.
2. Ask, “What two things is the author talking about?”
3. Look for clue words like both and but.
4. Find details that tell what is alike.
5. Find details that tell what is different.

You can think about it like this:

• Compare = same
• Contrast = different

What kinds of things can authors compare and contrast?

• animals
• places
• seasons
• jobs
• tools
• ways to do something

Worked Example 1

Read this short text:

Cats and dogs are both popular pets. Both animals have tails. Cats like to climb, but many dogs like to run and fetch.

Let’s find the compare and contrast parts.

• Compare clue word: both
• Alike: cats and dogs are popular pets
• Alike: both animals have tails
• Contrast clue word: but
• Different: cats like to climb; many dogs like to run and fetch

So this text compares cats and dogs by telling how they are the same. It contrasts them by telling how they are different.

Worked Example 2

Read this short text:

Summer and winter are seasons. Both seasons happen every year. Summer is hot, but winter is cold. In summer, children may swim. In winter, children may play in snow.

Now let’s sort the facts.

• Things that are alike: summer and winter are both seasons; both happen every year
• Things that are different: summer is hot; winter is cold; summer has swimming; winter has snow play

The author helps us understand each season by putting same and different details together.

Worked Example 3

Read this short text:

A map and a globe both show places on Earth. A map is flat, but a globe is round. A globe looks more like Earth, but a map is easier to carry.

Let’s think step by step.

1. What two things are being discussed? A map and a globe
2. How are they alike? Both show places on Earth
3. How are they different? A map is flat; a globe is round; a globe looks more like Earth; a map is easier to carry

This is a strong compare and contrast paragraph because it clearly gives same and different details.

Worked Example 4

Read this short text:

Frogs and fish both live in or near water. Fish use gills to breathe in water. Adult frogs use lungs to breathe air. Fish have fins, while frogs have legs.

Let’s deconstruct the text, or break it apart to understand it.

• Topic 1: frogs
• Topic 2: fish
• Alike: both live in or near water
• Different: fish use gills; adult frogs use lungs
• Different: fish have fins; frogs have legs

The author wants us to learn about frogs and fish by showing one big similarity and some important differences.

A helpful way to organize your thinking

You can make two simple lists in your head or on paper.

Same

• facts about both topics

Different

• facts about the first topic
• facts about the second topic

For example, if the topics are apples and oranges:

• Same: both are fruits, both can be juicy
• Different: apples can be crunchy, oranges have peels you can remove

Questions to ask yourself while reading

• What things is the author comparing?
• What is the same?
• What is different?
• Which clue words do I see?
• Why did the author put these topics together?

Often, the author compares and contrasts because it helps readers understand the subjects more clearly.

Watch out for this!

Sometimes a text gives only similarities. That is mostly comparing.

Sometimes a text gives only differences. That is mostly contrasting.

Sometimes a text gives both. That is compare and contrast structure.

Try this thinking:

If a text says, “Birds and bats can both fly, but birds have feathers and bats have fur,” then:

• the word both shows a similarity
• the word but shows a difference

Summary

Compare and contrast structure helps readers learn how two things are alike and different. Compare means alike. Contrast means different.

When you read nonfiction, look for clue words like both, same, but, and different. Then ask yourself what details match and what details do not match.

If you can find the topics, the similarities, and the differences, you can understand a compare and contrast text much better.

Author's Purpose means the reason an author writes a text.

When we read an informational text, we can ask: "Why did the author write this?"

In 2nd grade, we often look for four main author's purposes in informational texts:

• Inform — to teach facts
• Explain — to tell how or why something happens
• Describe — to help us picture something with details
• Persuade — to try to make us think or do something

Learning author's purpose helps us understand a text better. It helps us know what the author wants us to learn, feel, or do.

1. Inform

An author writes to inform when the goal is to give facts or teach about a topic.

You might read names, dates, places, or true details. The author is not trying to convince you. The author is mostly helping you learn.

Clues for inform:

• It has facts
• It teaches about a topic
• It answers questions like who, what, where, or when
• It may have headings, labels, or photos

Example: "Bats sleep during the day. At night, they fly out to look for food."

This author's purpose is inform because the sentences teach facts about bats.

2. Explain

An author writes to explain when the goal is to tell how something works or why something happens.

An explaining text often has steps, causes, or reasons.

Clues for explain:

• It tells how to do something
• It tells how something works
• It tells why something happens
• It may use words like first, next, because, and so

Example: "First, a seed is planted in soil. Next, it gets water and sunlight. Then it begins to grow."

This author's purpose is explain because the author tells how a plant grows.

3. Describe

An author writes to describe when the goal is to tell what something is like.

A describing text uses details that help the reader imagine the topic.

Clues for describe:

• It tells about colors, shapes, sizes, sounds, or looks
• It uses many details
• It helps you picture the topic in your mind

Example: "The desert is hot, dry, and sandy. Tall cacti stand under the bright sun."

This author's purpose is describe because the author helps us picture the desert.

4. Persuade

An author writes to persuade when the goal is to change your mind or get you to do something.

The author may give reasons why something is good, important, or the best choice.

Clues for persuade:

• It tells an opinion
• It gives reasons to agree
• It may use words like should, best, or important
• It wants you to think, choose, or act in a certain way

Example: "Our class should plant more trees. Trees give shade and help clean the air."

This author's purpose is persuade because the author wants readers to agree and plant trees.

How to figure out the author's purpose

1. Read the text carefully.
2. Ask yourself: Is the author teaching facts, telling how or why, helping me picture something, or trying to change my mind?
3. Look for clue words.
4. Think about the main goal of the whole text, not just one sentence.

Sometimes a text can do more than one thing. A text may give facts and also describe something. When that happens, choose the main purpose.

Ask: What is the author mostly trying to do?

Worked Example 1

Text: "Penguins are birds, but they cannot fly. They use their wings to help them swim in icy water."

Step 1: Does it give facts, explain how or why, describe, or persuade?

Step 2: The text gives true details about penguins.

Answer: The author's purpose is inform.

Worked Example 2

Text: "Rain forms when water in the air cools and turns into drops. The drops get bigger and fall from clouds."

Step 1: The text tells how rain happens.

Step 2: It explains a process.

Answer: The author's purpose is explain.

Worked Example 3

Text: "The peacock has bright blue feathers and a huge tail with round, colorful spots. Its tail opens like a giant fan."

Step 1: The text gives many details we can picture.

Step 2: It tells what the peacock looks like.

Answer: The author's purpose is describe.

Worked Example 4

Text: "Kids should drink water instead of soda. Water helps your body stay healthy, and it does not have lots of sugar."

Step 1: The text says should.

Step 2: It gives reasons to make the reader agree.

Answer: The author's purpose is persuade.

Let's compare

Read these two short texts about the same topic.

Text A: "Bees collect nectar from flowers. They help plants make seeds and fruits."

Text B: "Bees are fuzzy insects with striped bodies and busy wings."

Text A is mostly inform because it teaches facts.

Text B is mostly describe because it tells what bees are like.

This shows that different authors can write about the same topic for different reasons.

A helpful check

• If the text teaches facts, think inform.
• If the text tells how or why, think explain.
• If the text paints a picture with details, think describe.
• If the text wants you to agree or act, think persuade.

Beware of a tricky part

Some texts have facts in them, even when the author wants to persuade. For example, an author may use facts to convince you.

That is why you should think about the main reason for the writing.

Example: "Recess should be longer because exercise helps kids learn better."

This sentence has a fact-like reason, but the author is still trying to change your mind. The main purpose is persuade.

Summary

Author's purpose is the reason an author writes a text.

In informational reading, the main purposes we look for are inform, explain, describe, and persuade.

To find the author's purpose, think about what the author is mostly trying to do: teach facts, tell how or why, help you picture something, or change your mind.

Fact or Opinion?

When we read nonfiction, we learn information about real people, animals, places, and things. Good readers can tell the difference between a fact and an opinion.

This helps us understand what the author is teaching us and what the author is thinking or feeling.

What is a fact?

A fact is something that is true and can be checked. We can prove a fact.

• A fact can be seen, counted, measured, or looked up.
• Different people can check the same fact and get the same answer.

Examples of facts:

• The sun rises in the east.
• A week has 7 days.
• Dogs are animals.

What is an opinion?

An opinion is what someone thinks, feels, or believes. An opinion cannot be proven true for everyone.

• An opinion may use feeling words.
• Different people can have different opinions.

Examples of opinions:

• Summer is the best season.
• Dogs are the cutest pets.
• Reading is more fun than playing outside.

How can I tell the difference?

Ask yourself these questions:

1. Can I prove it? If yes, it is probably a fact.
2. Is it someones feeling or choice? If yes, it is probably an opinion.
3. Can people disagree? If yes, it may be an opinion.

Clue words for opinions

Opinion sentences often have words that show feelings or choices.

• best
• beautiful
• boring
• fun
• great
• yummy
• I think
• I believe
• should

These words do not always mean a sentence is an opinion, but they are helpful clues.

Be careful!

Sometimes a sentence can have both a fact and an opinion idea.

Example: The red apple is the tastiest fruit.

• The apple is red can be checked, so that part is a fact.
• the tastiest fruit is a feeling, so that part is an opinion.

Worked Example 1

Sentence: Cats have four legs.

Step 1: Ask, "Can I prove it?" Yes.

Step 2: We can look at cats and count their legs. Most cats have 4 legs.

Answer: This is a fact.

Worked Example 2

Sentence: Cats are the best pets.

Step 1: Ask, "Can I prove it?" No.

Step 2: Different people like different pets. Some people may like dogs, fish, or birds more.

Answer: This is an opinion.

Worked Example 3

Sentence: Penguins are birds.

Step 1: Ask, "Can I check this in a book or from a science source?" Yes.

Step 2: Animal books and science texts say penguins are birds.

Answer: This is a fact.

Worked Example 4

Sentence: Penguins are funny animals.

Step 1: Ask, "Is this a feeling word?" Yes. The word funny tells what someone thinks.

Step 2: Another person might think penguins are cute or interesting instead.

Answer: This is an opinion.

Fact and opinion in nonfiction

In nonfiction books and articles, authors often use many facts to teach readers.

Sometimes authors also share opinions. They may want readers to like something, choose something, or agree with them.

That is why it is important to stop and think: Is this something I can prove, or is it what someone thinks?

Lets practice together

Read each sentence. Decide if it is a fact or an opinion.

• The moon goes around Earth. — Fact
• The moon is beautiful. — Opinion
• There are 12 months in a year. — Fact
• Winter is the most fun season. — Opinion
• Bees make honey. — Fact
• Honey tastes better than jam. — Opinion

Quick tips to remember

• Fact = can be proved.
• Opinion = what someone thinks or feels.
• Look for clue words like best, pretty, fun, and should.
• Ask, Can everyone check it?

Summary

A fact is true and can be checked. An opinion tells a thought, feeling, or choice.

When you read nonfiction, look carefully at each sentence. If it can be proven, it is a fact. If it tells what someone thinks or feels, it is an opinion.

Lesson: Synthesizing Multiple Sources

When we read more than one text about the same topic, we can learn even more. One text may tell us one fact, and another text may tell us a different fact. When we put the facts together, we are synthesizing multiple sources.

Synthesizing means taking ideas from two or more places and combining them to make a bigger, better understanding.

Sources are the places where we get information. A source can be a book, an article, a poster, or a video.

So, synthesizing multiple sources means:

• reading or looking at two or more sources about the same topic,
• finding important facts in each one,
• and putting the facts together.

This helps us answer questions like:

• What do both sources teach me?
• What does one source teach that the other does not?
• What do I know now after reading both?

Why is this important?

Sometimes one source does not tell us everything. If we read only one text, we may know only part of the topic. If we read two or more texts, we can learn more details.

Reading more than one source also helps us:

• check facts,
• notice the same ideas,
• learn new details,
• and build a stronger understanding.

What do good readers do?

Good readers stop and think while they read. They ask:

• What is this source mostly about?
• What facts did I learn?
• Does this match something from another source?
• What new idea can I add?

How to synthesize multiple sources

1. Read the first source.
   Find important facts.
2. Read the second source.
   Find important facts there too.
3. Look for facts that are the same.
   These are ideas both sources share.
4. Look for facts that are different.
   These are new details from one source.
5. Put the ideas together.
   Tell or write what you now understand about the topic.

You can think: “Source 1 taught me this. Source 2 taught me that. Now I can put them together.”

Helpful question words

• Same: What do both sources say?
• Different: What does only one source say?
• Together: What do I know after reading both?

Worked Example 1: Apples

Source 1: Apples grow on trees. They can be red, green, or yellow.

Source 2: Apples are a fruit. Many people eat apples as a snack.

Step 1: Facts from Source 1

• Apples grow on trees.
• Apples can be red, green, or yellow.

Step 2: Facts from Source 2

• Apples are a fruit.
• People eat apples as a snack.

Step 3: Put the facts together

Synthesized idea: Apples are fruit that grow on trees. They can be red, green, or yellow, and people often eat them as a snack.

Now we know more from both sources than from only one source.

Worked Example 2: Frogs

Source 1: Frogs live near water. They lay eggs.

Source 2: Frogs can jump far. Many frogs eat insects.

What is the same?

Both sources are about frogs.

What is different?

• Source 1 tells where frogs live and that they lay eggs.
• Source 2 tells how frogs move and what they eat.

Synthesized idea: Frogs live near water and lay eggs. They can jump far, and many frogs eat insects.

This new sentence combines ideas from both sources.

Worked Example 3: The Sun

Source 1: The sun is a star. It gives Earth light.

Source 2: The sun gives Earth heat. Plants need sunlight to grow.

Think it through

• From Source 1, we learn what the sun is and that it gives light.
• From Source 2, we learn that it gives heat and helps plants grow.

Synthesized idea: The sun is a star that gives Earth light and heat. Plants need sunlight to grow.

This answer uses facts from both sources.

Worked Example 4: Bees

Source 1: Bees collect nectar from flowers. Bees live in hives.

Source 2: Bees help plants make seeds. Some bees make honey.

Let’s synthesize

Important facts:

• Bees collect nectar.
• Bees live in hives.
• Bees help plants.
• Some bees make honey.

Synthesized idea: Bees collect nectar from flowers and live in hives. They help plants make seeds, and some bees make honey.

This gives us a fuller picture of bees.

Tips for students

• Read carefully.
• Find the big facts.
• Do not tell only one source.
• Try to use ideas from both sources.
• Say the ideas in your own words.

Watch out for these mistakes

• Mistake 1: Telling facts from only one source.
  Fix it: Go back and add a fact from the other source.
• Mistake 2: Copying every word.
  Fix it: Say the ideas in your own words.
• Mistake 3: Mixing topics that do not match.
  Fix it: Make sure both sources are about the same topic.

A simple sentence frame

You can say:

“One source says ____. Another source says ____. Together, I learned ____.”

Here is an example:

“One source says turtles lay eggs. Another source says turtles have shells. Together, I learned that turtles have shells and lay eggs.”

Quick practice

Source 1: Penguins are birds. They have feathers.

Source 2: Penguins cannot fly. They are strong swimmers.

Possible synthesized idea: Penguins are birds with feathers. They cannot fly, but they are strong swimmers.

Summary

Synthesizing multiple sources means combining facts from two or more texts about the same topic.

We look for what is the same, what is different, and what we know when we put the ideas together.

When we synthesize, we build a bigger and clearer understanding of a topic.