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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 905 · 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. 1.4 + ? = 16
  2. 2.7 + 3 =
  3. 3.1 + ? = 10
  4. 4.11 + 5 =
  5. 5.9 + 10 =
  6. 6.2 + 10 =
  7. 7.7 + ? = 10
  8. 8.3 + ? = 20
  9. 9.3 + 6 + 10 =
  10. 10.4 + 5 + 10 =
  11. 11.There are 4 yellow beads and 16 red beads. How many beads are there in all?
  12. 12.2 + 2 + 8 =
  13. 13.Gurpreet has 2 flowers and gets 15 flowers more. How many flowers does Gurpreet have now?
  14. 14.5 + 4 + 2 =
  15. 15.? + 1 = 8
  16. 16.5 + 2 + 7 =
  17. 17.3 + ? = 6
  18. 18.5 + 13 =
  19. 19.16 + ? = 18
  20. 20.5 + 5 + 9 =
  21. 21.There are 6 blue balls and 11 pink balls. How many balls are there in all?
  22. 22.3 + ? = 4
  23. 23.15 + 1 =
  24. 24.? + 14 = 18
  25. 25.Rahul has 10 pencils and gets 4 pencils more. How many pencils does Rahul have now?
  26. 26.7 + 11 =
  27. 27.Aditya has 9 marbles and gets 11 marbles more. How many marbles does Aditya have now?
  28. 28.3 + 5 + 7 =
  29. 29.There are 4 green crayons and 15 blue crayons. How many crayons are there in all?
  30. 30.8 + 12 =
  31. 31.8 + 9 =
  32. 32.Kabir has 15 mangoes and gets 1 mango more. How many mangoes does Kabir have now?
  33. 33.? + 1 = 6
  34. 34.16 + 2 =
  35. 35.6 + 4 + 10 =
  36. 36.2 + 3 =
  37. 37.? + 9 = 15
  38. 38.There are 11 red balloons and 5 white balloons. How many balloons are there in all?
  39. 39.5 + 3 + 9 =
  40. 40.11 + 9 =

Answer key

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

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