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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 427 · 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. 1.12 + ? = 13
  2. 2.Kavya has 2 books and gets 16 books more. How many books does Kavya have now?
  3. 3.5 + ? = 13
  4. 4.8 + 3 =
  5. 5.5 + ? = 6
  6. 6.3 + ? = 4
  7. 7.There are 4 yellow flowers and 11 green flowers. How many flowers are there in all?
  8. 8.2 + ? = 15
  9. 9.3 + 16 =
  10. 10.Aditya has 14 shells and gets 2 shells more. How many shells does Aditya have now?
  11. 11.? + 6 = 11
  12. 12.There are 8 white flowers and 8 yellow flowers. How many flowers are there in all?
  13. 13.15 + 2 =
  14. 14.8 + 4 + 8 =
  15. 15.5 + 2 + 5 =
  16. 16.12 + 3 =
  17. 17.10 + 1 =
  18. 18.Kavya has 4 mangoes and gets 11 mangoes more. How many mangoes does Kavya have now?
  19. 19.2 + ? = 20
  20. 20.5 + 5 + 5 =
  21. 21.18 + 1 =
  22. 22.There are 12 blue beads and 2 red beads. How many beads are there in all?
  23. 23.There are 3 blue kites and 9 red kites. How many kites are there in all?
  24. 24.There are 6 red kites and 2 green kites. How many kites are there in all?
  25. 25.Ishaan has 6 mangoes and gets 2 mangoes more. How many mangoes does Ishaan have now?
  26. 26.There are 7 green crayons and 5 blue crayons. How many crayons are there in all?
  27. 27.11 + 8 =
  28. 28.? + 8 = 16
  29. 29.6 + 4 =
  30. 30.2 + 4 + 5 =
  31. 31.Karan has 15 balls and gets 2 balls more. How many balls does Karan have now?
  32. 32.There are 9 red flowers and 4 green flowers. How many flowers are there in all?
  33. 33.13 + 7 =
  34. 34.Diya has 2 balls and gets 2 balls more. How many balls does Diya have now?
  35. 35.8 + 7 + 3 =
  36. 36.8 + 5 + 6 =
  37. 37.? + 11 = 15
  38. 38.Rohan has 12 books and gets 5 books more. How many books does Rohan have now?
  39. 39.12 + 8 =
  40. 40.? + 13 = 15

Answer key

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

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