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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 225 · 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. 1.9 + 11 =
  2. 2.3 + 2 + 9 =
  3. 3.4 + 3 + 6 =
  4. 4.? + 3 = 9
  5. 5.5 + 5 =
  6. 6.3 + 8 + 7 =
  7. 7.Rohan has 6 shells and gets 12 shells more. How many shells does Rohan have now?
  8. 8.11 + ? = 12
  9. 9.There are 6 white crayons and 2 red crayons. How many crayons are there in all?
  10. 10.5 + 5 + 4 =
  11. 11.? + 11 = 15
  12. 12.8 + 8 + 1 =
  13. 13.18 + 1 =
  14. 14.4 + 11 =
  15. 15.There are 7 white beads and 4 red beads. How many beads are there in all?
  16. 16.Tara has 12 marbles and gets 5 marbles more. How many marbles does Tara have now?
  17. 17.1 + 1 =
  18. 18.2 + ? = 15
  19. 19.7 + 2 + 4 =
  20. 20.? + 1 = 10
  21. 21.11 + 7 =
  22. 22.There are 9 pink crayons and 4 green crayons. How many crayons are there in all?
  23. 23.There are 12 yellow flowers and 6 red flowers. How many flowers are there in all?
  24. 24.10 + 2 =
  25. 25.There are 8 white flowers and 2 pink flowers. How many flowers are there in all?
  26. 26.16 + ? = 20
  27. 27.Priya has 12 marbles and gets 1 marble more. How many marbles does Priya have now?
  28. 28.16 + 3 =
  29. 29.There are 11 pink kites and 4 yellow kites. How many kites are there in all?
  30. 30.5 + ? = 7
  31. 31.1 + 2 + 6 =
  32. 32.4 + 8 + 8 =
  33. 33.Meera has 7 laddoos and gets 2 laddoos more. How many laddoos does Meera have now?
  34. 34.? + 2 = 3
  35. 35.5 + 1 + 14 =
  36. 36.Riya has 12 shells and gets 8 shells more. How many shells does Riya have now?
  37. 37.10 + 6 =
  38. 38.? + 1 = 5
  39. 39.Saanvi has 13 shells and gets 3 shells more. How many shells does Saanvi have now?
  40. 40.Priya has 15 books and gets 1 book more. How many books does Priya have now?

Answer key

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

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