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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 663 · 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.There are 9 yellow crayons and 7 green crayons. How many crayons are there in all?
  2. 2.There are 9 red balloons and 9 green balloons. How many balloons are there in all?
  3. 3.5 + 10 =
  4. 4.5 + ? = 8
  5. 5.There are 5 green balls and 8 blue balls. How many balls are there in all?
  6. 6.? + 3 = 11
  7. 7.? + 4 = 15
  8. 8.7 + 5 + 1 =
  9. 9.5 + 8 =
  10. 10.Karan has 4 pencils and gets 2 pencils more. How many pencils does Karan have now?
  11. 11.? + 10 = 15
  12. 12.7 + 1 + 1 =
  13. 13.There are 12 yellow flowers and 3 white flowers. How many flowers are there in all?
  14. 14.18 + 2 =
  15. 15.11 + 9 =
  16. 16.Aarav has 13 shells and gets 1 shell more. How many shells does Aarav have now?
  17. 17.13 + 2 =
  18. 18.4 + 3 =
  19. 19.There are 5 white balloons and 4 pink balloons. How many balloons are there in all?
  20. 20.Aarav has 5 balls and gets 6 balls more. How many balls does Aarav have now?
  21. 21.5 + 5 =
  22. 22.2 + ? = 5
  23. 23.2 + ? = 17
  24. 24.There are 8 blue balloons and 7 yellow balloons. How many balloons are there in all?
  25. 25.2 + ? = 10
  26. 26.There are 11 white flowers and 9 green flowers. How many flowers are there in all?
  27. 27.8 + 4 + 5 =
  28. 28.5 + 6 + 1 =
  29. 29.19 + 1 =
  30. 30.6 + 8 + 6 =
  31. 31.2 + 1 + 13 =
  32. 32.6 + 6 =
  33. 33.Zoya has 15 crayons and gets 1 crayon more. How many crayons does Zoya have now?
  34. 34.13 + 6 =
  35. 35.4 + 4 + 6 =
  36. 36.There are 12 yellow balls and 8 pink balls. How many balls are there in all?
  37. 37.18 + 1 =
  38. 38.8 + ? = 14
  39. 39.There are 6 green crayons and 9 blue crayons. How many crayons are there in all?
  40. 40.3 + ? = 11

Answer key

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

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