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1st Grade Subtraction Worksheets (Within 20)

Free printable first-grade subtraction worksheets with answer keys, adjustable number range, optional ten-frame visuals, and a missing-number mode. Fresh randomized PDF every time — no signup, no limits.

Aligned to CCSS 1.OA.6 · Add & subtract within 20

Practices CCSS 1.OA.4 & 1.OA.8

Subtraction Within 20

Aligned to CCSS 1.OA.6

Name: ___________________________ Date: _____________

1.18 − 18 =
2.8 − 7 =
3.1 − 1 =
4.7 − 2 =
5.11 − 2 =
6.11 − 7 =
7.12 − 8 =
8.1 − 0 =
9.10 − 7 =
10.17 − 16 =
11.16 − 1 =
12.3 − 3 =
13.13 − 11 =
14.14 − 13 =
15.13 − 7 =
16.12 − 11 =

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FAQ

What does “subtraction within 20” mean?

Subtraction within 20 means the starting number (the minuend) is 20 or below — for example 15 − 7 = 8. This is part of the core first-grade standard CCSS 1.OA.6, where students build fluency with facts to 10 and use strategies like counting back and thinking of subtraction as an unknown-addend problem.

How do ten-frames help with subtraction?

A ten-frame lets a first grader see the starting amount, then cross out the number being subtracted and count what is left. The ten-frame layout on this generator shows the minuend as filled counters so children can model the take-away physically before writing the answer.

What is a missing-number subtraction problem?

A missing-number problem leaves a blank in the equation, such as 14 − ▢ = 6. Solving it pushes students to see subtraction as an unknown-addend problem (CCSS 1.OA.4 and 1.OA.8) — a key first-grade reasoning skill. Turn it on with the “Missing number” option.

Are these subtraction worksheets free?

Yes — completely free, no signup, no download limit. Pick your range and layout, click Download PDF, and print a fresh randomized worksheet every time.