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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 821 · 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. 1.698 − ? = 576
  2. 2.A school has 389 children. 377 of them are girls. How many boys are there?
  3. 3.953 − 599 =
  4. 4.? − 496 = 19
  5. 5.? + 151 = 460
  6. 6.896 − 471 =
  7. 7.649 − ? = 444
  8. 8.605 + ? = 999
  9. 9.352 − 328 =
  10. 10.A school has 486 children. 411 of them are girls. How many boys are there?
  11. 11.? + 364 = 739
  12. 12.? + 565 = 837
  13. 13.933 − 327 =
  14. 14.493 − 198 =
  15. 15.? − 638 = 120
  16. 16.554 + ? = 852
  17. 17.A school has 849 children. 784 of them are girls. How many boys are there?
  18. 18.? + 494 = 897
  19. 19.A train has 706 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  20. 20.? + 356 = 921
  21. 21.? + 293 = 495
  22. 22.695 − 645 =
  23. 23.305 + 499 =
  24. 24.308 − ? = 29
  25. 25.A school has 236 children. 158 of them are girls. How many boys are there?
  26. 26.864 − 225 =
  27. 27.538 + 169 =
  28. 28.A train has 226 people in the front coaches and 679 people in the back coaches. How many people are on the train?
  29. 29.A school has 349 children. 196 of them are girls. How many boys are there?
  30. 30.A school has 749 children. 423 of them are girls. How many boys are there?
  31. 31.534 + 235 =
  32. 32.526 − 124 =
  33. 33.165 + 419 =
  34. 34.834 − ? = 376
  35. 35.A school has 303 children. 232 of them are girls. How many boys are there?
  36. 36.A train has 822 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  37. 37.? + 196 = 676
  38. 38.441 − ? = 235
  39. 39.514 + 243 =
  40. 40.126 + 721 =

Answer key

  1. 122
  2. 12
  3. 354
  4. 515
  5. 309
  6. 425
  7. 205
  8. 394
  9. 24
  10. 75
  11. 375
  12. 272
  13. 606
  14. 295
  15. 758
  16. 298
  17. 65
  18. 403
  19. 860
  20. 565
  21. 202
  22. 50
  23. 804
  24. 279
  25. 78
  26. 639
  27. 707
  28. 905
  29. 153
  30. 326
  31. 769
  32. 402
  33. 584
  34. 458
  35. 71
  36. 946
  37. 480
  38. 206
  39. 757
  40. 847

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