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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 842 · 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. 1.1 + 9 =
  2. 2.Vivaan has 11 marbles and gets 5 marbles more. How many marbles does Vivaan have now?
  3. 3.15 + 5 =
  4. 4.5 + 14 =
  5. 5.5 + 4 + 9 =
  6. 6.2 + ? = 20
  7. 7.? + 5 = 6
  8. 8.10 + 2 =
  9. 9.6 + 2 + 6 =
  10. 10.Dev has 6 laddoos and gets 13 laddoos more. How many laddoos does Dev have now?
  11. 11.16 + ? = 18
  12. 12.19 + 1 =
  13. 13.There are 10 pink flowers and 2 white flowers. How many flowers are there in all?
  14. 14.17 + 3 =
  15. 15.? + 1 = 4
  16. 16.? + 6 = 11
  17. 17.There are 8 white balloons and 5 pink balloons. How many balloons are there in all?
  18. 18.Arjun has 2 balls and gets 4 balls more. How many balls does Arjun have now?
  19. 19.There are 12 yellow balloons and 2 red balloons. How many balloons are there in all?
  20. 20.1 + ? = 6
  21. 21.? + 5 = 10
  22. 22.There are 10 green balloons and 5 white balloons. How many balloons are there in all?
  23. 23.1 + 5 + 2 =
  24. 24.There are 4 blue crayons and 16 pink crayons. How many crayons are there in all?
  25. 25.1 + 2 + 6 =
  26. 26.There are 8 red beads and 4 white beads. How many beads are there in all?
  27. 27.1 + 4 + 7 =
  28. 28.4 + 1 =
  29. 29.3 + 12 =
  30. 30.6 + 14 =
  31. 31.Ishaan has 2 pencils and gets 9 pencils more. How many pencils does Ishaan have now?
  32. 32.7 + 8 + 5 =
  33. 33.4 + ? = 7
  34. 34.6 + 5 + 6 =
  35. 35.6 + 1 + 6 =
  36. 36.There are 8 green flowers and 12 blue flowers. How many flowers are there in all?
  37. 37.Vivaan has 10 books and gets 6 books more. How many books does Vivaan have now?
  38. 38.3 + 15 =
  39. 39.7 + 12 =
  40. 40.There are 6 green balls and 10 red balls. How many balls are there in all?

Answer key

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

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