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Worksheets›Grade 1›Addition & subtraction›Subtraction within 20

Subtraction Within 20 Worksheets

Free printable worksheets with answer keys. Pick a level, preview the questions, then open the sheet to swap or delete any single question.

Grade 1CCSS 1.OA.C.6Answer key includedPDF · Print
Open in generatorStart with an easy sheet

Easy: Numbers up to 10

  1. 1.6 − 3 =
  2. 2.9 − 2 =
  3. 3.10 − 5 =
  4. 4.4 − 1 =
  5. 5.10 − 7 =
  6. 6.5 − 5 =
Preview shows 6 of 12 questions. Every sheet is new; open it to change any question.

Worksheet variations

Subtraction facts within 20 build on addition. Crossing ten is easiest in two jumps: 13 − 5 = 13 − 3 − 2 = 8.

Easy3 − 1 =Numbers up to 10Medium16 − 5 =Teen numbers, no crossing tenHard14 − 8 =Teen numbers, crossing ten

How to solve it: a worked example

Subtract.

  1. Start6 − 3 =
  2. Think addition3 + 3 = 6
  3. Answer3

Common mistakes to watch for

  • Subtracting the smaller digit from the larger one, so 13 − 5 becomes 12.
  • Counting back and including the starting number.
  • Adding instead of subtracting when the signs look alike.

Tip: tick “Step-by-step answer key” in the generator to print each step for marking.

Related worksheets

Addition within 20Missing numbers in equationsTwo-digit addition (Grade 2)Two-digit subtraction (Grade 2)Adding & subtracting within 1000 (Grade 2)

FAQ

Is every worksheet different?

Yes. Numbers are generated each time, and the answer key is calculated for that sheet. Swap any single question and its answer updates too.

Can I mix subtraction within 20 with other skills?

Yes. In the generator, add more skills; each gets its own section on the sheet with its own instructions.

Is it free to print?

Yes. Generating and printing from the browser is free with no sign-up. PDF downloads need a free account.