Skills Covered

How to Use These Worksheets

Students find the missing number in each number bond diagram. The whole (top circle) breaks into two parts (bottom circles). Understanding these relationships builds a strong foundation for addition and subtraction.

In the Classroom

Use for independent practice or assessment when teaching number decomposition. These worksheets help students apply their understanding of part-part-whole relationships with larger numbers.

At Home

Use a number line or base-ten blocks for support. Have your child practice thinking about "how many more to make the whole?" Then use the worksheet to reinforce the concept with written number bonds.

Tips for Success

• Think about "how many more to make the whole?"
• Use doubles facts as anchors
• Check by adding both parts
• Use the answer key for self-checking

Common Core Standards Alignment

These worksheets support the following Common Core State Standards for Mathematics:

• 1.OA.B.4 — Understand subtraction as an unknown-addend problem
• 1.OA.C.6 — Add and subtract within 20
• 2.OA.B.2 — Fluently add and subtract within 20 using mental strategies