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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 379 · 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. 1.615 − 263 =
  2. 2.224 − ? = 114
  3. 3.? − 121 = 210
  4. 4.989 − 386 =
  5. 5.A school has 901 children. 646 of them are girls. How many boys are there?
  6. 6.A school has 206 children. 190 of them are girls. How many boys are there?
  7. 7.410 + 370 =
  8. 8.557 − 518 =
  9. 9.A train has 858 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  10. 10.A train has 860 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  11. 11.635 + ? = 791
  12. 12.? + 379 = 838
  13. 13.A school has 232 children. 116 of them are girls. How many boys are there?
  14. 14.A school has 583 children. 215 of them are girls. How many boys are there?
  15. 15.451 + ? = 680
  16. 16.A school has 802 children. 142 of them are girls. How many boys are there?
  17. 17.A school has 299 children. 137 of them are girls. How many boys are there?
  18. 18.846 − 621 =
  19. 19.682 − 296 =
  20. 20.491 − 169 =
  21. 21.? − 241 = 391
  22. 22.401 − ? = 51
  23. 23.797 − ? = 695
  24. 24.? + 612 = 995
  25. 25.549 + 192 =
  26. 26.A school has 440 children. 376 of them are girls. How many boys are there?
  27. 27.531 − 396 =
  28. 28.801 − ? = 346
  29. 29.109 + ? = 806
  30. 30.A school has 814 children. 282 of them are girls. How many boys are there?
  31. 31.? − 397 = 268
  32. 32.556 + 389 =
  33. 33.A school has 314 children. 179 of them are girls. How many boys are there?
  34. 34.382 − 144 =
  35. 35.? + 316 = 666
  36. 36.955 − 174 =
  37. 37.113 + ? = 352
  38. 38.476 − 325 =
  39. 39.A school has 389 children. 332 of them are girls. How many boys are there?
  40. 40.A train has 365 people in the front coaches and 543 people in the back coaches. How many people are on the train?

Answer key

  1. 352
  2. 110
  3. 331
  4. 603
  5. 255
  6. 16
  7. 780
  8. 39
  9. 997
  10. 995
  11. 156
  12. 459
  13. 116
  14. 368
  15. 229
  16. 660
  17. 162
  18. 225
  19. 386
  20. 322
  21. 632
  22. 350
  23. 102
  24. 383
  25. 741
  26. 64
  27. 135
  28. 455
  29. 697
  30. 532
  31. 665
  32. 945
  33. 135
  34. 238
  35. 350
  36. 781
  37. 239
  38. 151
  39. 57
  40. 908

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