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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 720 · 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 + 2 + 1 =
  2. 2.? + 7 = 18
  3. 3.12 + 6 =
  4. 4.There are 3 white crayons and 5 blue crayons. How many crayons are there in all?
  5. 5.11 + 3 =
  6. 6.19 + 1 =
  7. 7.There are 4 blue crayons and 2 red crayons. How many crayons are there in all?
  8. 8.There are 8 white balloons and 6 pink balloons. How many balloons are there in all?
  9. 9.There are 6 blue beads and 11 green beads. How many beads are there in all?
  10. 10.5 + 14 =
  11. 11.? + 15 = 20
  12. 12.5 + 8 =
  13. 13.3 + 10 =
  14. 14.Nisha has 10 mangoes and gets 7 mangoes more. How many mangoes does Nisha have now?
  15. 15.Riya has 5 pencils and gets 8 pencils more. How many pencils does Riya have now?
  16. 16.1 + 4 + 8 =
  17. 17.11 + 6 =
  18. 18.2 + ? = 18
  19. 19.Ishaan has 5 shells and gets 9 shells more. How many shells does Ishaan have now?
  20. 20.1 + ? = 8
  21. 21.7 + ? = 19
  22. 22.14 + 4 =
  23. 23.? + 4 = 10
  24. 24.12 + 1 =
  25. 25.There are 7 red flowers and 5 blue flowers. How many flowers are there in all?
  26. 26.1 + 5 =
  27. 27.Rahul has 3 bananas and gets 13 bananas more. How many bananas does Rahul have now?
  28. 28.Ananya has 12 crayons and gets 6 crayons more. How many crayons does Ananya have now?
  29. 29.5 + 1 + 12 =
  30. 30.15 + 2 =
  31. 31.There are 12 yellow balloons and 3 pink balloons. How many balloons are there in all?
  32. 32.? + 1 = 7
  33. 33.3 + 2 + 9 =
  34. 34.8 + 7 + 4 =
  35. 35.5 + 3 + 11 =
  36. 36.5 + 8 + 5 =
  37. 37.4 + 6 + 7 =
  38. 38.2 + 1 + 13 =
  39. 39.There are 11 yellow beads and 7 red beads. How many beads are there in all?
  40. 40.9 + ? = 12

Answer key

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

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