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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 723 · 40 sums
TalentJR

The method (Count on): Start with the bigger number. Count on the smaller number, one finger at a time. For a missing number (8 + ? = 15), count on from 8 up to 15, or take away: 15 − 8.

NameDateTime takenScore ___ / 40
  1. 1.? + 10 = 12
  2. 2.There are 10 white kites and 4 yellow kites. How many kites are there in all?
  3. 3.Arjun has 9 marbles and gets 3 marbles more. How many marbles does Arjun have now?
  4. 4.4 + ? = 17
  5. 5.4 + 2 + 13 =
  6. 6.11 + 1 =
  7. 7.1 + ? = 11
  8. 8.5 + 4 + 5 =
  9. 9.There are 5 yellow balloons and 9 red balloons. How many balloons are there in all?
  10. 10.6 + 6 =
  11. 11.There are 4 yellow crayons and 12 red crayons. How many crayons are there in all?
  12. 12.1 + 19 =
  13. 13.6 + ? = 15
  14. 14.4 + 1 + 2 =
  15. 15.7 + 3 + 3 =
  16. 16.Tara has 4 crayons and gets 3 crayons more. How many crayons does Tara have now?
  17. 17.1 + 2 + 1 =
  18. 18.6 + 8 + 1 =
  19. 19.Arjun has 9 shells and gets 4 shells more. How many shells does Arjun have now?
  20. 20.7 + 8 + 3 =
  21. 21.8 + 1 + 2 =
  22. 22.15 + ? = 16
  23. 23.7 + ? = 8
  24. 24.6 + 4 + 10 =
  25. 25.2 + 17 =
  26. 26.1 + 7 + 8 =
  27. 27.3 + ? = 9
  28. 28.15 + 1 =
  29. 29.8 + 8 + 3 =
  30. 30.2 + ? = 9
  31. 31.3 + 3 =
  32. 32.18 + 1 =
  33. 33.There are 6 blue crayons and 9 white crayons. How many crayons are there in all?
  34. 34.There are 9 blue balls and 3 yellow balls. How many balls are there in all?
  35. 35.1 + ? = 6
  36. 36.7 + 12 =
  37. 37.There are 9 green crayons and 10 red crayons. How many crayons are there in all?
  38. 38.5 + 1 + 5 =
  39. 39.There are 4 white balloons and 12 red balloons. How many balloons are there in all?
  40. 40.8 + 1 + 3 =

Answer key

  1. 2
  2. 14
  3. 12
  4. 13
  5. 19
  6. 12
  7. 10
  8. 14
  9. 14
  10. 12
  11. 16
  12. 20
  13. 9
  14. 7
  15. 13
  16. 7
  17. 4
  18. 15
  19. 13
  20. 18
  21. 11
  22. 1
  23. 1
  24. 20
  25. 19
  26. 16
  27. 6
  28. 16
  29. 19
  30. 7
  31. 6
  32. 19
  33. 15
  34. 12
  35. 5
  36. 19
  37. 19
  38. 11
  39. 16
  40. 12

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