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Class 1 Maths Worksheet: Addition

Maths worksheets lesson 3: Addition up to 20 · Set 870 · 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. 1.5 + 3 + 2 =
  2. 2.19 + 1 =
  3. 3.6 + ? = 11
  4. 4.? + 1 = 8
  5. 5.There are 6 red kites and 14 blue kites. How many kites are there in all?
  6. 6.There are 8 blue kites and 11 white kites. How many kites are there in all?
  7. 7.8 + 6 + 6 =
  8. 8.2 + 3 =
  9. 9.7 + ? = 8
  10. 10.6 + ? = 7
  11. 11.5 + ? = 10
  12. 12.5 + 10 =
  13. 13.11 + 6 =
  14. 14.1 + 3 + 5 =
  15. 15.2 + 15 =
  16. 16.Gurpreet has 15 flowers and gets 4 flowers more. How many flowers does Gurpreet have now?
  17. 17.2 + 5 =
  18. 18.17 + 3 =
  19. 19.10 + 7 =
  20. 20.7 + 3 + 4 =
  21. 21.There are 8 yellow balloons and 8 red balloons. How many balloons are there in all?
  22. 22.Rohan has 9 shells and gets 5 shells more. How many shells does Rohan have now?
  23. 23.Saanvi has 3 pencils and gets 12 pencils more. How many pencils does Saanvi have now?
  24. 24.13 + 4 =
  25. 25.There are 12 yellow flowers and 3 red flowers. How many flowers are there in all?
  26. 26.2 + 1 + 5 =
  27. 27.Kavya has 10 flowers and gets 10 flowers more. How many flowers does Kavya have now?
  28. 28.Ananya has 8 flowers and gets 1 flower more. How many flowers does Ananya have now?
  29. 29.14 + 3 =
  30. 30.Karan has 5 balls and gets 14 balls more. How many balls does Karan have now?
  31. 31.4 + 5 + 2 =
  32. 32.2 + ? = 5
  33. 33.2 + ? = 12
  34. 34.There are 3 green balloons and 11 pink balloons. How many balloons are there in all?
  35. 35.4 + 8 + 2 =
  36. 36.2 + 14 =
  37. 37.? + 4 = 19
  38. 38.Isha has 3 mangoes and gets 15 mangoes more. How many mangoes does Isha have now?
  39. 39.6 + 8 + 2 =
  40. 40.5 + 8 + 3 =

Answer key

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

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