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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 573 · 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.? + 153 = 324
  2. 2.831 − ? = 605
  3. 3.479 − ? = 57
  4. 4.381 − 175 =
  5. 5.550 + 117 =
  6. 6.A train has 838 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  7. 7.A school has 928 children. 590 of them are girls. How many boys are there?
  8. 8.401 + 140 =
  9. 9.? − 135 = 207
  10. 10.245 − 219 =
  11. 11.239 − ? = 84
  12. 12.? − 434 = 209
  13. 13.? − 371 = 18
  14. 14.A train has 437 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  15. 15.807 − 357 =
  16. 16.A school has 711 children. 683 of them are girls. How many boys are there?
  17. 17.A train has 816 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  18. 18.? − 185 = 445
  19. 19.? − 162 = 42
  20. 20.? − 256 = 71
  21. 21.586 − ? = 107
  22. 22.950 − 657 =
  23. 23.538 + ? = 834
  24. 24.A train has 235 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  25. 25.809 + 135 =
  26. 26.841 + 112 =
  27. 27.848 + ? = 960
  28. 28.A train has 669 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  29. 29.? + 369 = 666
  30. 30.A train has 233 people in the front coaches and 500 people in the back coaches. How many people are on the train?
  31. 31.A train has 578 people in the front coaches and 297 people in the back coaches. How many people are on the train?
  32. 32.210 − ? = 104
  33. 33.? + 294 = 542
  34. 34.344 + 649 =
  35. 35.? − 136 = 237
  36. 36.436 − 401 =
  37. 37.810 − 191 =
  38. 38.? − 287 = 3
  39. 39.858 + 121 =
  40. 40.? + 591 = 958

Answer key

  1. 171
  2. 226
  3. 422
  4. 206
  5. 667
  6. 985
  7. 338
  8. 541
  9. 342
  10. 26
  11. 155
  12. 643
  13. 389
  14. 553
  15. 450
  16. 28
  17. 950
  18. 630
  19. 204
  20. 327
  21. 479
  22. 293
  23. 296
  24. 379
  25. 944
  26. 953
  27. 112
  28. 823
  29. 297
  30. 733
  31. 875
  32. 106
  33. 248
  34. 993
  35. 373
  36. 35
  37. 619
  38. 290
  39. 979
  40. 367

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