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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 609 · 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. 1.3 + 2 + 15 =
  2. 2.1 + ? = 13
  3. 3.Dev has 3 balloons and gets 12 balloons more. How many balloons does Dev have now?
  4. 4.16 + 1 =
  5. 5.4 + 7 + 3 =
  6. 6.12 + 3 =
  7. 7.13 + 3 =
  8. 8.4 + 7 =
  9. 9.11 + 2 =
  10. 10.There are 9 red balls and 11 blue balls. How many balls are there in all?
  11. 11.6 + 10 =
  12. 12.2 + ? = 8
  13. 13.5 + 15 =
  14. 14.8 + 5 =
  15. 15.2 + 3 =
  16. 16.? + 3 = 18
  17. 17.Rahul has 6 pencils and gets 7 pencils more. How many pencils does Rahul have now?
  18. 18.There are 6 white crayons and 4 pink crayons. How many crayons are there in all?
  19. 19.Farhan has 5 shells and gets 2 shells more. How many shells does Farhan have now?
  20. 20.? + 9 = 13
  21. 21.There are 9 white kites and 8 blue kites. How many kites are there in all?
  22. 22.? + 15 = 20
  23. 23.6 + 8 + 2 =
  24. 24.5 + 1 + 2 =
  25. 25.There are 11 blue balls and 3 pink balls. How many balls are there in all?
  26. 26.11 + 6 =
  27. 27.Ishaan has 14 crayons and gets 4 crayons more. How many crayons does Ishaan have now?
  28. 28.6 + 7 =
  29. 29.Rohan has 12 pencils and gets 3 pencils more. How many pencils does Rohan have now?
  30. 30.There are 2 yellow balloons and 14 red balloons. How many balloons are there in all?
  31. 31.Rahul has 2 balls and gets 2 balls more. How many balls does Rahul have now?
  32. 32.8 + 5 + 2 =
  33. 33.3 + 2 =
  34. 34.Priya has 2 kites and gets 4 kites more. How many kites does Priya have now?
  35. 35.5 + 3 =
  36. 36.Vivaan has 7 crayons and gets 10 crayons more. How many crayons does Vivaan have now?
  37. 37.3 + 5 =
  38. 38.1 + ? = 3
  39. 39.3 + 1 + 15 =
  40. 40.3 + 10 =

Answer key

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

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