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Worksheets · 24 questions

Adding and Taking Away to 20 Worksheet

Twenty-four sums inside twenty, three sheets, and the answers at the bottom.

Adding and taking away to 20 · Sheet 1 Name:
  1. 16 + 2
  2. 8 - 6
  3. 20 - 4
  4. 8 + 10
  5. 18 + 1
  6. 1 + 8
  7. 4 + 12
  8. 1 + 12
  9. 19 - 12
  10. 3 + 2
  11. 9 - 1
  12. 7 - 6
  13. 9 + 11
  14. 5 + 9
  15. 9 - 3
  16. 2 - 2
  17. 12 - 5
  18. 7 - 1
  19. 7 + 9
  20. 12 - 3
  21. 14 - 10
  22. 4 - 4
  23. 13 - 8
  24. 4 - 1
Adding and taking away to 20 · Sheet 2 Name:
  1. 10 + 9
  2. 6 + 8
  3. 8 + 10
  4. 17 + 3
  5. 17 - 12
  6. 7 + 2
  7. 16 - 1
  8. 15 + 3
  9. 7 - 4
  10. 2 - 1
  11. 11 + 9
  12. 12 + 8
  13. 2 + 12
  14. 16 - 8
  15. 14 - 7
  16. 19 - 5
  17. 7 - 3
  18. 2 + 15
  19. 13 + 3
  20. 5 - 3
  21. 16 + 1
  22. 15 + 4
  23. 3 - 2
  24. 19 - 10
Adding and taking away to 20 · Sheet 3 Name:
  1. 18 + 1
  2. 14 + 4
  3. 16 - 13
  4. 6 - 2
  5. 16 + 4
  6. 17 + 1
  7. 3 + 4
  8. 9 + 7
  9. 13 - 12
  10. 11 + 3
  11. 12 + 8
  12. 17 + 2
  13. 10 - 7
  14. 18 - 6
  15. 10 + 10
  16. 2 + 14
  17. 6 - 3
  18. 18 - 1
  19. 7 + 6
  20. 14 + 2
  21. 5 - 3
  22. 10 + 2
  23. 2 - 2
  24. 3 + 12

Answers

Sheet 1 1. 18 2. 2 3. 16 4. 18 5. 19 6. 9 7. 16 8. 13 9. 7 10. 5 11. 8 12. 1 13. 20 14. 14 15. 6 16. 0 17. 7 18. 6 19. 16 20. 9 21. 4 22. 0 23. 5 24. 3

Sheet 2 1. 19 2. 14 3. 18 4. 20 5. 5 6. 9 7. 15 8. 18 9. 3 10. 1 11. 20 12. 20 13. 14 14. 8 15. 7 16. 14 17. 4 18. 17 19. 16 20. 2 21. 17 22. 19 23. 1 24. 9

Sheet 3 1. 19 2. 18 3. 3 4. 4 5. 20 6. 18 7. 7 8. 16 9. 1 10. 14 11. 20 12. 19 13. 3 14. 12 15. 20 16. 16 17. 3 18. 17 19. 13 20. 16 21. 2 22. 12 23. 0 24. 15

What this practises

Adding and taking away inside twenty, in both directions. This is the range a child uses for a whole year, and it is the one worth over-practising: everything after it assumes these come back without counting.

How to use it

Do not time it. Timed drills are a documented cause of early maths anxiety, and a sheet that is raced through teaches speed rather than arithmetic. Twenty-four questions is about ten minutes for a six-year-old who is not being hurried.

Mark it together rather than handing it back marked. The conversation about the two that were wrong is the part that does the teaching.

What to look for

Where the pauses are, not how many are wrong. Steady on 5 + 3 and slow on 8 + 5 means the crossing of ten is the thing to work on, and that is a much more useful finding than a score.

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