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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 285 · 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. 1.2 + ? = 8
  2. 2.There are 6 white balls and 4 red balls. How many balls are there in all?
  3. 3.13 + 1 =
  4. 4.There are 7 white crayons and 3 green crayons. How many crayons are there in all?
  5. 5.9 + 1 =
  6. 6.9 + 8 =
  7. 7.8 + 5 =
  8. 8.4 + 5 + 11 =
  9. 9.7 + 8 + 4 =
  10. 10.18 + 1 =
  11. 11.1 + ? = 3
  12. 12.Rahul has 6 mangoes and gets 5 mangoes more. How many mangoes does Rahul have now?
  13. 13.? + 19 = 20
  14. 14.? + 4 = 6
  15. 15.There are 2 blue balls and 18 green balls. How many balls are there in all?
  16. 16.8 + 6 =
  17. 17.There are 9 red flowers and 5 yellow flowers. How many flowers are there in all?
  18. 18.Farhan has 4 shells and gets 4 shells more. How many shells does Farhan have now?
  19. 19.5 + 7 =
  20. 20.? + 9 = 12
  21. 21.5 + 4 + 7 =
  22. 22.There are 9 white balloons and 6 red balloons. How many balloons are there in all?
  23. 23.8 + 8 =
  24. 24.2 + 6 + 5 =
  25. 25.There are 2 white beads and 10 red beads. How many beads are there in all?
  26. 26.4 + 3 + 9 =
  27. 27.14 + 6 =
  28. 28.? + 13 = 14
  29. 29.13 + 5 =
  30. 30.3 + 4 + 13 =
  31. 31.5 + 5 + 4 =
  32. 32.2 + ? = 4
  33. 33.7 + 8 + 2 =
  34. 34.6 + 1 + 1 =
  35. 35.15 + 4 =
  36. 36.2 + 1 + 3 =
  37. 37.Diya has 13 crayons and gets 5 crayons more. How many crayons does Diya have now?
  38. 38.4 + ? = 9
  39. 39.Kavya has 14 balls and gets 6 balls more. How many balls does Kavya have now?
  40. 40.6 + ? = 13

Answer key

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

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