🧮 Addition Within 20 (A)

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Solve each problem. Show your working if you need to.

1.12 + 4 =

2.12 + 3 =

3.8 + 1 =

4.3 + 2 =

5.10 + 3 =

6.10 + 4 =

7.12 + 2 =

8.10 + 9 =

9.8 + 1 =

10.4 + 6 =

11.11 + 2 =

12.5 + 14 =

13.9 + 1 =

14.8 + 10 =

15.12 + 2 =

16.5 + 1 =

17.4 + 3 =

18.2 + 3 =

19.10 + 5 =

20.3 + 14 =

Answer key: 1. 16 · 2. 15 · 3. 9 · 4. 5 · 5. 13 · 6. 14 · 7. 14 · 8. 19 · 9. 9 · 10. 10 · 11. 13 · 12. 19 · 13. 10 · 14. 18 · 15. 14 · 16. 6 · 17. 7 · 18. 5 · 19. 15 · 20. 17

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Worksheets › Grade 1 › Numbers & maths

Grade 1 (ages 6–7)Numbers & mathsFree printable PDF

About this grade 1 worksheet

Free 1st grade addition worksheet: 20 addition facts within 20, with answer key. Practise counting on and making ten (set A). Skill: Adding within 20. Level: Grade 1 — also suits Year 2 (UK).

For teachers: skills & standards

CCSS 1.OA.C.6: Add and subtract within 20, with fluency within 10
Works as a morning-work page, a centre/station activity, homework or an early-finisher task.

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What age is it for?

It is designed for Grade 1 (ages 6–7), but use it with any child who is ready.

What skills does it build?

Adding within 20.

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