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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 635 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.? + 377 = 517
  2. 2.284 − ? = 85
  3. 3.661 + 134 =
  4. 4.944 − 885 =
  5. 5.A school has 512 children. 466 of them are girls. How many boys are there?
  6. 6.295 + 237 =
  7. 7.A school has 740 children. 226 of them are girls. How many boys are there?
  8. 8.A train has 655 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  9. 9.571 − 372 =
  10. 10.528 + 345 =
  11. 11.A train has 883 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  12. 12.483 + ? = 610
  13. 13.885 + 114 =
  14. 14.251 − 215 =
  15. 15.? + 782 = 920
  16. 16.? + 390 = 493
  17. 17.A school has 859 children. 662 of them are girls. How many boys are there?
  18. 18.563 + 288 =
  19. 19.803 − 784 =
  20. 20.A train has 496 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  21. 21.745 − ? = 510
  22. 22.379 − 119 =
  23. 23.647 + 106 =
  24. 24.917 − 517 =
  25. 25.? + 278 = 722
  26. 26.712 + 121 =
  27. 27.A train has 251 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  28. 28.244 − 126 =
  29. 29.A school has 738 children. 681 of them are girls. How many boys are there?
  30. 30.? + 511 = 826
  31. 31.890 + 106 =
  32. 32.918 − 561 =
  33. 33.530 + 290 =
  34. 34.A train has 336 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  35. 35.A school has 666 children. 129 of them are girls. How many boys are there?
  36. 36.A train has 742 people in the front coaches and 152 people in the back coaches. How many people are on the train?
  37. 37.A school has 897 children. 703 of them are girls. How many boys are there?
  38. 38.555 − 403 =
  39. 39.718 + 135 =
  40. 40.824 + 163 =

Answer key

  1. 140
  2. 199
  3. 795
  4. 59
  5. 46
  6. 532
  7. 514
  8. 845
  9. 199
  10. 873
  11. 994
  12. 127
  13. 999
  14. 36
  15. 138
  16. 103
  17. 197
  18. 851
  19. 19
  20. 972
  21. 235
  22. 260
  23. 753
  24. 400
  25. 444
  26. 833
  27. 465
  28. 118
  29. 57
  30. 315
  31. 996
  32. 357
  33. 820
  34. 496
  35. 537
  36. 894
  37. 194
  38. 152
  39. 853
  40. 987

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