10 printable sets · answer key on every set

Number Bonds to 10 Worksheets

CCSS K.OA.A.3
20 problems per set
Answer key included

What this skill is

Knowing every pair that makes 10: 1 and 9, 2 and 8, 3 and 7, and so on.

When it comes up: End of kindergarten. This is the single most useful fact set in early elementary math.

The mistake to watch for

Treating each pair as a separate fact to memorize, instead of noticing that as one part goes up, the other goes down.

How to help

Lay out ten counters and slide them into two groups. Move one across at a time and say both numbers. The pattern shows itself.

Next: Addition within 20, where making ten becomes a strategy.

A worked example

Which number goes with 4 to make 10? Hold up 4 fingers. The fingers still down show how many more you need: 6. So 4 + 6 = 10.

Words to know

part: One piece of a whole. In 3 + 4 = 7, the parts are 3 and 4.
whole: All of something. In 3 + 4 = 7, the whole is 7.
total: All of the things added together.
ten: The number 10, one more than nine.
pair: Two things that go together.
sum: The answer you get when you add.

Practice

Write the missing part.

Showing Set 1 · 20 problems

___ + 7 = 10
___ + 5 = 10
___ + 10 = 10
___ + 3 = 10
___ + 4 = 10
___ + 1 = 10
___ + 0 = 10
___ + 2 = 10
___ + 8 = 10
___ + 9 = 10
___ + 6 = 10
1 + ___ = 10
8 + ___ = 10
0 + ___ = 10
6 + ___ = 10
5 + ___ = 10
3 + ___ = 10
10 + ___ = 10
2 + ___ = 10
9 + ___ = 10

Download this set20 problems · answer key included PDF

Answer key

All 10 sets

Each set is a different list of 20 problems with its own answer key. Use the buttons above to look at one on this page, or download any of them as a PDF.

How these sheets were made

Problems are generated for each set and checked against K.OA.A.3 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.