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Class 1Ages 5–6

Class 1 Addition Worksheet (Within 20)

Twenty single-step sums where the total never goes past 20. The sums mix small numbers with bonds to 10, so children can use fingers or counters at first and gradually move to knowing the facts.

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Maths Guru · Class 1 Addition Worksheet (Within 20)

Name: ____________________ Date: ____________ Score: ____ / 20

Add the numbers. Write the answer on the line.

  1. 1 + 17 = ___
  2. 8 + 2 = ___
  3. 8 + 5 = ___
  4. 15 + 1 = ___
  5. 4 + 15 = ___
  6. 14 + 3 = ___
  7. 12 + 7 = ___
  8. 8 + 10 = ___
  9. 2 + 7 = ___
  10. 3 + 17 = ___
  11. 6 + 8 = ___
  12. 6 + 4 = ___
  13. 12 + 5 = ___
  14. 13 + 5 = ___
  15. 8 + 7 = ___
  16. 8 + 11 = ___
  17. 3 + 16 = ___
  18. 4 + 3 = ___
  19. 3 + 7 = ___
  20. 7 + 4 = ___

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Answer key: Class 1 Addition Worksheet (Within 20)

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

Tip for parents

Ask your child to circle the sums they got instantly. Next time practise only the others.

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