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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 688 · 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. 1.719 − ? = 292
  2. 2.A train has 761 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  3. 3.A train has 298 people in the front coaches and 336 people in the back coaches. How many people are on the train?
  4. 4.778 + 122 =
  5. 5.A train has 859 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  6. 6.782 − ? = 58
  7. 7.424 − 417 =
  8. 8.376 + 295 =
  9. 9.467 − 224 =
  10. 10.A train has 727 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  11. 11.? + 418 = 897
  12. 12.776 − 703 =
  13. 13.416 − 145 =
  14. 14.711 + ? = 893
  15. 15.A school has 862 children. 199 of them are girls. How many boys are there?
  16. 16.A school has 875 children. 417 of them are girls. How many boys are there?
  17. 17.319 + 341 =
  18. 18.873 − ? = 31
  19. 19.835 + 121 =
  20. 20.A school has 758 children. 498 of them are girls. How many boys are there?
  21. 21.680 − 275 =
  22. 22.A train has 240 people in the front coaches and 193 people in the back coaches. How many people are on the train?
  23. 23.710 + ? = 928
  24. 24.668 − ? = 295
  25. 25.A train has 557 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  26. 26.492 − ? = 337
  27. 27.265 − ? = 13
  28. 28.478 + ? = 666
  29. 29.A school has 254 children. 212 of them are girls. How many boys are there?
  30. 30.380 + 224 =
  31. 31.232 + 741 =
  32. 32.774 + 175 =
  33. 33.A train has 892 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  34. 34.252 + ? = 624
  35. 35.A school has 280 children. 131 of them are girls. How many boys are there?
  36. 36.242 + 273 =
  37. 37.516 − 267 =
  38. 38.145 + 531 =
  39. 39.292 − 266 =
  40. 40.993 − 455 =

Answer key

  1. 427
  2. 890
  3. 634
  4. 900
  5. 973
  6. 724
  7. 7
  8. 671
  9. 243
  10. 862
  11. 479
  12. 73
  13. 271
  14. 182
  15. 663
  16. 458
  17. 660
  18. 842
  19. 956
  20. 260
  21. 405
  22. 433
  23. 218
  24. 373
  25. 723
  26. 155
  27. 252
  28. 188
  29. 42
  30. 604
  31. 973
  32. 949
  33. 992
  34. 372
  35. 149
  36. 515
  37. 249
  38. 676
  39. 26
  40. 538

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