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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 299 · 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.? + 7 = 8
  2. 2.? + 1 = 11
  3. 3.2 + 7 + 11 =
  4. 4.12 + ? = 16
  5. 5.4 + 16 =
  6. 6.5 + 15 =
  7. 7.2 + 4 + 14 =
  8. 8.There are 4 red balloons and 5 blue balloons. How many balloons are there in all?
  9. 9.There are 7 white kites and 3 red kites. How many kites are there in all?
  10. 10.5 + ? = 10
  11. 11.2 + 5 + 3 =
  12. 12.2 + 7 =
  13. 13.18 + 2 =
  14. 14.4 + 6 + 1 =
  15. 15.? + 1 = 12
  16. 16.1 + 5 + 2 =
  17. 17.5 + 8 + 5 =
  18. 18.10 + 8 =
  19. 19.7 + 7 + 6 =
  20. 20.6 + 1 + 13 =
  21. 21.? + 5 = 12
  22. 22.3 + ? = 6
  23. 23.Zoya has 8 flowers and gets 7 flowers more. How many flowers does Zoya have now?
  24. 24.17 + 1 =
  25. 25.3 + 3 =
  26. 26.3 + ? = 11
  27. 27.Tara has 2 bananas and gets 1 banana more. How many bananas does Tara have now?
  28. 28.19 + 1 =
  29. 29.There are 7 green balloons and 9 red balloons. How many balloons are there in all?
  30. 30.There are 2 yellow balloons and 4 blue balloons. How many balloons are there in all?
  31. 31.Gurpreet has 15 kites and gets 1 kite more. How many kites does Gurpreet have now?
  32. 32.5 + 8 + 4 =
  33. 33.There are 2 red beads and 3 blue beads. How many beads are there in all?
  34. 34.There are 11 white balls and 4 pink balls. How many balls are there in all?
  35. 35.? + 15 = 16
  36. 36.1 + ? = 4
  37. 37.14 + 3 =
  38. 38.6 + 4 + 8 =
  39. 39.8 + 3 + 6 =
  40. 40.3 + 1 + 11 =

Answer key

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

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