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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 814 · 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. 1.796 − 307 =
  2. 2.A train has 383 people in the front coaches and 361 people in the back coaches. How many people are on the train?
  3. 3.160 + 391 =
  4. 4.754 − 438 =
  5. 5.301 + 606 =
  6. 6.489 + ? = 729
  7. 7.428 − 390 =
  8. 8.A school has 561 children. 185 of them are girls. How many boys are there?
  9. 9.A train has 609 people in the front coaches and 315 people in the back coaches. How many people are on the train?
  10. 10.269 + 176 =
  11. 11.855 + 110 =
  12. 12.291 + 134 =
  13. 13.? − 401 = 66
  14. 14.974 − ? = 149
  15. 15.A train has 348 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  16. 16.A school has 645 children. 532 of them are girls. How many boys are there?
  17. 17.608 − 233 =
  18. 18.? + 476 = 939
  19. 19.A train has 801 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  20. 20.321 + ? = 679
  21. 21.A school has 665 children. 653 of them are girls. How many boys are there?
  22. 22.699 − 698 =
  23. 23.A train has 493 people in the front coaches and 376 people in the back coaches. How many people are on the train?
  24. 24.323 + 237 =
  25. 25.369 + ? = 676
  26. 26.228 + 457 =
  27. 27.669 + 138 =
  28. 28.171 + ? = 894
  29. 29.259 − 179 =
  30. 30.534 + 255 =
  31. 31.A school has 393 children. 123 of them are girls. How many boys are there?
  32. 32.555 − 366 =
  33. 33.372 − ? = 17
  34. 34.A train has 868 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  35. 35.425 − ? = 249
  36. 36.390 − ? = 75
  37. 37.173 + 466 =
  38. 38.345 − 242 =
  39. 39.952 − 937 =
  40. 40.701 + 151 =

Answer key

  1. 489
  2. 744
  3. 551
  4. 316
  5. 907
  6. 240
  7. 38
  8. 376
  9. 924
  10. 445
  11. 965
  12. 425
  13. 467
  14. 825
  15. 448
  16. 113
  17. 375
  18. 463
  19. 928
  20. 358
  21. 12
  22. 1
  23. 869
  24. 560
  25. 307
  26. 685
  27. 807
  28. 723
  29. 80
  30. 789
  31. 270
  32. 189
  33. 355
  34. 979
  35. 176
  36. 315
  37. 639
  38. 103
  39. 15
  40. 852

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