Add It Up!

Ace

Tier 1

Lesson Plan

Add It Up! Lesson Plan

Students will be able to solve addition problems within 20 using various strategies like counting on, making ten, and using number bonds, and demonstrate their understanding through guided and independent practice.

Mastering addition within 20 is fundamental for developing strong number sense, which is a key building block for all future mathematical concepts and real-world problem-solving.

Audience

1st Grade

Time

30 minutes

Approach

Engaging activities and direct instruction.

Materials

"Add It Up!" Slide Deck, Addition Within 20 Worksheet, Addition Within 20 Answer Key, Warm Up: Count to 20!, and Cool Down: One More, One Less

Prep

Teacher Preparation

15 minutes

Review the Add It Up! Lesson Plan and all linked materials: "Add It Up!" Slide Deck, Addition Within 20 Worksheet, Addition Within 20 Answer Key, Warm Up: Count to 20!, and Cool Down: One More, One Less.
- Print copies of the Addition Within 20 Worksheet for each student.
- Prepare any physical manipulatives (e.g., counters, unifix cubes) if desired for demonstration or student use.
- Ensure projector and computer are set up for the "Add It Up!" Slide Deck.

Step 1

Warm-Up: Count to 20!

5 minutes

Begin with the Warm Up: Count to 20!. Have students count orally from 1 to 20, then practice counting on from different numbers (e.g., start at 8, count on 5).

Step 2

Introduction: What is Addition?

5 minutes

Use the "Add It Up!" Slide Deck to introduce addition as

Step 3

Guided Practice: Let's Add!

10 minutes

Continue using the "Add It Up!" Slide Deck to work through various addition problems within 20 as a class.
- Model strategies like counting on, using fingers, or drawing pictures.
- Encourage students to share their own strategies for solving problems.
- Use manipulatives to demonstrate problems on the board, and encourage students to use them at their desks if available.

Step 4

Independent Practice: Worksheet Time

7 minutes

Distribute the Addition Within 20 Worksheet.
- Explain that students will work independently to solve the addition problems.
- Circulate around the room to provide individual support and answer questions.

Step 5

Cool Down: One More, One Less

3 minutes

Conclude the lesson with the Cool Down: One More, One Less activity to check for understanding.
- Collect student worksheets for assessment.

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Slide Deck

Welcome! Let's Add!

Today, we're going to become Addition Superstars!

Get ready to make numbers bigger!

Welcome students and introduce the topic of addition. Ask students what they already know about adding.

What is Addition?

Addition means putting two or more numbers together.

It helps us find the total or sum.

Think: "How many altogether?"

Explain what addition means in simple terms. Use examples with fingers or objects.

Our Addition Signs

We use special signs in addition:

+ is the plus sign. It means "add."

= is the equals sign. It means "is the same as" or "makes."

Introduce the plus sign and equals sign. Show simple examples.

Let's Count and Add!

Look at the pictures. How many are there?

🍎🍎 + 🍎 = ?

Show me on your fingers!

2 + 1 = 3

Guided practice slide. Ask students to count the objects and then the total.

More Adding Fun!

How many altogether?

🐥🐥🐥 + 🐥🐥 = ?

What strategy can you use?

3 + 2 = 5

Another guided practice example, encouraging different strategies.

Adding to 10... and Beyond!

We can add small numbers, like 4 + 3.

But we can also add bigger numbers, like 10 + 5!

It's still about putting numbers together.

Let's try counting on!

Introduce adding within 10, then lead into larger numbers up to 20. Emphasize counting on.

Counting On Example

Let's solve 8 + 4

Put 8 in your head.
Count on 4 more: 9, 10, 11, 12.

So, 8 + 4 = 12!

Example for counting on. Model putting the larger number in your head and counting up.

Your Turn! Counting On

Try this one:

6 + 5 = ?

(Give students time to think and try it)

What did you get?

6 + 5 = 11

Another counting on example. Have students try this one.

Your Addition Tools

Remember, you have lots of ways to add!

Fingers
Drawing pictures
Counting on from the bigger number
Using manipulatives (like counters or blocks)

Review different strategies: fingers, drawing, counting on.

Time to Practice!

Now it's your turn to be an Addition Superstar!

You'll get a worksheet to practice adding on your own.

Remember your strategies!

Transition to independent practice with the worksheet.

Wrap Up & Reflect

Great job, everyone!

Let's do one more quick activity to see what you learned.

Prepare students for the cool-down activity.

Worksheet

Addition Within 20 Worksheet

Name: ____________________

Date: _____________________

Directions: Solve each addition problem. You can use your fingers, draw pictures, or count on!

5 + 3 =
7 + 2 =
4 + 6 =
8 + 5 =
9 + 4 =
6 + 6 =
10 + 3 =
12 + 4 =
11 + 7 =
15 + 5 =

Challenge Problem!

You have 7 red apples and 6 green apples. How many apples do you have in total?

Answer Key

Addition Within 20 Answer Key

Directions: Solve each addition problem.

5 + 3 = 8
Thought Process: Start at 5, count on 3 more: 6, 7, 8.
7 + 2 = 9
Thought Process: Start at 7, count on 2 more: 8, 9.
4 + 6 = 10
Thought Process: Start at 6, count on 4 more: 7, 8, 9, 10.
8 + 5 = 13
Thought Process: Start at 8, count on 5 more: 9, 10, 11, 12, 13.
9 + 4 = 13
Thought Process: Start at 9, count on 4 more: 10, 11, 12, 13.
6 + 6 = 12
Thought Process: Start at 6, count on 6 more: 7, 8, 9, 10, 11, 12. (Or recognize as a doubles fact).
10 + 3 = 13
Thought Process: Start at 10, count on 3 more: 11, 12, 13.
12 + 4 = 16
Thought Process: Start at 12, count on 4 more: 13, 14, 15, 16.
11 + 7 = 18
Thought Process: Start at 11, count on 7 more: 12, 13, 14, 15, 16, 17, 18.
15 + 5 = 20
Thought Process: Start at 15, count on 5 more: 16, 17, 18, 19, 20.

Challenge Problem!

You have 7 red apples and 6 green apples. How many apples do you have in total?

7 + 6 = 13 apples
Thought Process: Start at 7, count on 6 more: 8, 9, 10, 11, 12, 13.

Warm Up

Warm Up: Count to 20!

Get Ready to Count!

Let's get our brains warmed up for adding! We're going to practice counting.

Part 1: Count Aloud

As a class, let's count aloud from 1 to 20. Make sure everyone's voice is heard!
Now, let's count backwards from 10 to 1.

Part 2: Count On!

I'll say a number, and you'll count on a few more. Listen carefully!
- Start at 5, count on 3 more. What number do you land on?
- Start at 10, count on 5 more. What number do you land on?
- Start at 7, count on 4 more. What number do you land on?
- Start at 13, count on 2 more. What number do you land on?

Great counting, everyone! You're ready to add!

Cool Down

Cool Down: One More, One Less

Time to Think!

To finish up, let's think about numbers and adding!

If you have 8 apples and get one more, how many do you have?
If you have 15 stickers and get one more, how many do you have?
What is one new thing you learned about adding today?

Great job today, Addition Superstars!