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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 646 · 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. 1.704 − 102 =
  2. 2.639 − 586 =
  3. 3.A train has 172 people in the front coaches and 762 people in the back coaches. How many people are on the train?
  4. 4.618 + 278 =
  5. 5.A school has 951 children. 374 of them are girls. How many boys are there?
  6. 6.? + 521 = 752
  7. 7.? + 171 = 461
  8. 8.? − 710 = 131
  9. 9.179 + 268 =
  10. 10.319 + 131 =
  11. 11.? + 679 = 965
  12. 12.? − 969 = 9
  13. 13.597 + 295 =
  14. 14.979 − 187 =
  15. 15.A train has 199 people in the front coaches and 628 people in the back coaches. How many people are on the train?
  16. 16.? + 129 = 943
  17. 17.A school has 409 children. 364 of them are girls. How many boys are there?
  18. 18.? + 401 = 728
  19. 19.? + 502 = 834
  20. 20.925 − 407 =
  21. 21.? + 841 = 945
  22. 22.A train has 118 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  23. 23.339 − ? = 17
  24. 24.505 − 451 =
  25. 25.A school has 630 children. 303 of them are girls. How many boys are there?
  26. 26.? + 588 = 961
  27. 27.628 + 289 =
  28. 28.A train has 229 people in the front coaches and 267 people in the back coaches. How many people are on the train?
  29. 29.662 + ? = 770
  30. 30.216 − 133 =
  31. 31.? + 375 = 730
  32. 32.235 + 140 =
  33. 33.A train has 275 people in the front coaches and 483 people in the back coaches. How many people are on the train?
  34. 34.A school has 511 children. 238 of them are girls. How many boys are there?
  35. 35.? + 349 = 903
  36. 36.? − 819 = 96
  37. 37.249 − ? = 34
  38. 38.A train has 807 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  39. 39.A train has 327 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  40. 40.868 − ? = 457

Answer key

  1. 602
  2. 53
  3. 934
  4. 896
  5. 577
  6. 231
  7. 290
  8. 841
  9. 447
  10. 450
  11. 286
  12. 978
  13. 892
  14. 792
  15. 827
  16. 814
  17. 45
  18. 327
  19. 332
  20. 518
  21. 104
  22. 307
  23. 322
  24. 54
  25. 327
  26. 373
  27. 917
  28. 496
  29. 108
  30. 83
  31. 355
  32. 375
  33. 758
  34. 273
  35. 554
  36. 915
  37. 215
  38. 913
  39. 455
  40. 411

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