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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 95 · 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. 1.535 − 332 =
  2. 2.414 + 580 =
  3. 3.? + 359 = 551
  4. 4.? − 204 = 94
  5. 5.185 + 287 =
  6. 6.309 − ? = 123
  7. 7.A school has 355 children. 163 of them are girls. How many boys are there?
  8. 8.? + 338 = 694
  9. 9.414 + 391 =
  10. 10.262 − ? = 31
  11. 11.A school has 444 children. 419 of them are girls. How many boys are there?
  12. 12.? + 137 = 605
  13. 13.? − 640 = 106
  14. 14.286 − ? = 127
  15. 15.A train has 154 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  16. 16.A school has 574 children. 110 of them are girls. How many boys are there?
  17. 17.746 + 207 =
  18. 18.A school has 498 children. 360 of them are girls. How many boys are there?
  19. 19.A train has 413 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  20. 20.? − 269 = 53
  21. 21.A school has 935 children. 873 of them are girls. How many boys are there?
  22. 22.A train has 824 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  23. 23.630 + ? = 839
  24. 24.A train has 454 people in the front coaches and 517 people in the back coaches. How many people are on the train?
  25. 25.570 + 342 =
  26. 26.796 − ? = 614
  27. 27.? + 147 = 368
  28. 28.A train has 607 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  29. 29.? + 584 = 915
  30. 30.A school has 690 children. 336 of them are girls. How many boys are there?
  31. 31.445 + 420 =
  32. 32.883 − 618 =
  33. 33.A school has 401 children. 292 of them are girls. How many boys are there?
  34. 34.? − 451 = 499
  35. 35.? + 682 = 968
  36. 36.? − 369 = 579
  37. 37.462 + 519 =
  38. 38.A school has 857 children. 649 of them are girls. How many boys are there?
  39. 39.990 − ? = 500
  40. 40.? − 240 = 92

Answer key

  1. 203
  2. 994
  3. 192
  4. 298
  5. 472
  6. 186
  7. 192
  8. 356
  9. 805
  10. 231
  11. 25
  12. 468
  13. 746
  14. 159
  15. 344
  16. 464
  17. 953
  18. 138
  19. 622
  20. 322
  21. 62
  22. 931
  23. 209
  24. 971
  25. 912
  26. 182
  27. 221
  28. 776
  29. 331
  30. 354
  31. 865
  32. 265
  33. 109
  34. 950
  35. 286
  36. 948
  37. 981
  38. 208
  39. 490
  40. 332

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