10 printable sets · answer key on every set

Addition Within 10 Worksheets

CCSS K.OA.A.5
20 problems per set
Answer key included

What this skill is

Adding two numbers with a total no greater than 10.

When it comes up: Late kindergarten. Fluency within 10 is the kindergarten end-of-year goal.

The mistake to watch for

Relying on fingers for every problem well past the point where the facts could be recalled — accurate, but slow enough to stall later work.

How to help

Practice the doubles first (2+2, 3+3, 4+4, 5+5). Doubles get memorized quickly and give children an anchor for near-doubles like 4+5.

Next: Subtraction within 10, then number bonds.

A worked example

Try 6 + 3. Start at 6 and count up three more: 7, 8, 9. So 6 + 3 = 9. Starting from the bigger number makes counting on easy.

Words to know

add: To put numbers together to find how many in all.
plus: The sign ( + ) that means add.
equal: The same amount. The sign = means "is equal to".
total: All of the things added together.
sum: The answer you get when you add.
ten: The number 10, one more than nine.

Practice

Add.

Showing Set 1 · 20 problems

8 + 2 =
5 + 1 =
7 + 2 =
6 + 3 =
5 + 2 =
4 + 2 =
4 + 6 =
4 + 3 =
2 + 6 =
8 + 1 =
7 + 3 =
2 + 5 =
4 + 1 =
1 + 4 =
1 + 7 =
4 + 5 =
2 + 1 =
7 + 1 =
6 + 2 =
2 + 4 =

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.5 before the sheet is built — no duplicates, and every problem falls inside the standard's number range.