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 math centers or guided practice when teaching number decomposition. These worksheets help students see that numbers can be broken apart and put back together in different ways.

At Home

Use counters to model the bonds. Split a group of objects into two parts and ask your child to figure out the missing number. Then use the worksheet to reinforce the concept with written number bonds.

Tips for Success

• Start by identifying the whole
• Use addition to find a missing part
• 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:

• K.OA.A.3 — Decompose numbers less than or equal to 10
• K.OA.A.5 — Fluently add and subtract within 5
• 1.OA.B.4 — Understand subtraction as an unknown-addend problem
• 1.OA.C.6 — Add and subtract within 20