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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 608 · 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.A train has 721 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  2. 2.419 + 514 =
  3. 3.A school has 277 children. 216 of them are girls. How many boys are there?
  4. 4.A train has 227 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  5. 5.210 − 106 =
  6. 6.427 − 121 =
  7. 7.895 − 155 =
  8. 8.A train has 665 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  9. 9.351 − 123 =
  10. 10.120 + ? = 249
  11. 11.? + 508 = 741
  12. 12.374 − ? = 167
  13. 13.229 + 413 =
  14. 14.? − 223 = 656
  15. 15.A school has 767 children. 445 of them are girls. How many boys are there?
  16. 16.509 + ? = 706
  17. 17.855 + 103 =
  18. 18.364 + ? = 954
  19. 19.? + 405 = 615
  20. 20.104 + ? = 485
  21. 21.? + 114 = 329
  22. 22.548 − 375 =
  23. 23.568 + ? = 954
  24. 24.922 − 893 =
  25. 25.A train has 141 people in the front coaches and 730 people in the back coaches. How many people are on the train?
  26. 26.554 − ? = 68
  27. 27.332 + 533 =
  28. 28.A school has 535 children. 352 of them are girls. How many boys are there?
  29. 29.? + 302 = 649
  30. 30.A school has 938 children. 807 of them are girls. How many boys are there?
  31. 31.586 + 150 =
  32. 32.321 + ? = 434
  33. 33.601 − 352 =
  34. 34.A school has 745 children. 493 of them are girls. How many boys are there?
  35. 35.658 − 124 =
  36. 36.? + 613 = 999
  37. 37.473 − 286 =
  38. 38.A school has 633 children. 244 of them are girls. How many boys are there?
  39. 39.693 + 146 =
  40. 40.553 + 106 =

Answer key

  1. 870
  2. 933
  3. 61
  4. 529
  5. 104
  6. 306
  7. 740
  8. 943
  9. 228
  10. 129
  11. 233
  12. 207
  13. 642
  14. 879
  15. 322
  16. 197
  17. 958
  18. 590
  19. 210
  20. 381
  21. 215
  22. 173
  23. 386
  24. 29
  25. 871
  26. 486
  27. 865
  28. 183
  29. 347
  30. 131
  31. 736
  32. 113
  33. 249
  34. 252
  35. 534
  36. 386
  37. 187
  38. 389
  39. 839
  40. 659

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