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1st and 2nd Grade Add by Composing and Decomposing Numbers Resources

Number bonds are a great way for your kids to explore the relationship between addition and subtraction. By filling in the missing numbers, students get experience with fact families.

Number Bonds All Around

This fact family worksheet gets kids to add and subtract. In this fact family worksheet, third graders will fill in the missing numbers in fact family houses.

Fact Family Houses

Give your young mathematicians practice with number bonds and number sentences in this visually interesting worksheet that has students composing and decomposing numbers.

Compose and Decompose Within 20

Give your students simple two-digit numbers to practice the decomposition addition strategy! This can be used as a stand-alone activity or in conjunction with the Composing and Decomposing lesson plan.

Decompose to Add: Two Digits Within 20

The decomposing and composing subtraction strategy can be a handy tool for tough three-digit numbers. Use this worksheet to give your students the practice they need to nail down the concept.

Subtraction with Decomposition

Give your young math learner practice composing numbers 11&ndash;19 with this addition strategies worksheet!

Compose 11-19: Ten and Ones #1

Practice decomposing numbers and writing equations with this kindergarten and first-grade math worksheet!

Decompose 11-19: Tens and Ones #1

The third in a series of six, this addition worksheet gives learners more practice composing numbers 11&ndash;19!

Compose 11-19: Ten and Ones #3

The second in a series of six, this addition worksheet gives learners more practice composing numbers 11&ndash;19!

Compose 11-19: Ten and Ones #2

The fourth in a series of six, this addition worksheet gives learners more practice composing numbers 11&ndash;19!

Compose 11-19: Ten and Ones #4

The fifth in a series of six, this addition worksheet gives learners more practice composing numbers 11&ndash;19!

Compose 11-19: Ten and Ones #5

Your child will help by completing fact family houses with the information given. Then, she will use the word bank to fill out sentences about her observations.

Making Number Connections

Which equation makes 10? Help young mathematicians figure it out in this treasure diving math game.

Treasure Diving: Compose Numbers to Make 10 (Game 2)

Children flex their mental math muscles as they try to quickly find the equations that add up to 10.

Water Rafting: Compose Numbers to Make 10 (Game 3)

Your child will enjoy cutting and pasting while solving problems to fill in the missing information.

Find the Missing Fact Family Number

Ask your child to practice adding up to 10 and breaking down math equations in this math race.

Treasure Diving: Compose Numbers to Make 10 (Game 3)

How do you make 10? Dive into a math adventure and discover simple equations that add up to 10.

Treasure Diving: Compose Numbers to Make 10 (Game 1)

First graders gain confidence with addition and decomposing numbers in this fun water rafting game! 

Water Rafting: Compose Numbers to Make 10 (Game 2)

In this energizing math game, think about how different numbers can add up to 20.

Treasure Diving: Compose Numbers to Make 20 (Game 3)

In this water rafting adventure, children will be asked to choose the equation that adds up to 10.

Water Rafting: Compose Numbers to Make 10 (Game 1)

Compose numbers to make 20 and build first grade addition skills in each round of this online game.

Treasure Diving: Compose Numbers to Make 20 (Game 2)

Children will love racing to the finish line while boosting their addition and mental math skills.

Water Rafting: Compose Numbers to Make 20 (Game 2)

Find the sum of 12 plus 8 and other combinations that make 20 in this online diving adventure.

Treasure Diving: Compose Numbers to Make 20 (Game 1)

Children race down the river and across the finish line by choosing the equations that make 20.

Water Rafting: Compose Numbers to Make 20 (Game 1)

Children use their mental math skills to determine which equations add up to 20 in this math game.

Water Rafting: Compose Numbers to Make 20 (Game 3)

In this engaging, hands-on lesson, students solidify their understanding of place value by adding and regrouping two-digit numbers using M&Ms.

M&M Math

Use this lesson to introduce composing and decomposing as part of your students’ addition and subtraction toolkits.

Composing and Decomposing

Get more practice decomposing numbers and writing equations with this inviting math worksheet!

Decompose 11-19: Tens and Ones #2

Decompose 11-19: Tens and Ones #3

Decompose 11-19: Tens and Ones #4

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