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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 390 · 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.? − 292 = 41
  2. 2.? + 713 = 986
  3. 3.? + 710 = 879
  4. 4.A school has 668 children. 172 of them are girls. How many boys are there?
  5. 5.A school has 624 children. 132 of them are girls. How many boys are there?
  6. 6.? − 381 = 415
  7. 7.? + 156 = 716
  8. 8.892 − 225 =
  9. 9.798 + 132 =
  10. 10.515 − 455 =
  11. 11.441 + 319 =
  12. 12.872 − 515 =
  13. 13.143 + ? = 386
  14. 14.349 − 286 =
  15. 15.630 − 614 =
  16. 16.? − 912 = 57
  17. 17.255 − 156 =
  18. 18.A school has 652 children. 483 of them are girls. How many boys are there?
  19. 19.A train has 449 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  20. 20.? − 588 = 231
  21. 21.? + 170 = 687
  22. 22.A school has 472 children. 469 of them are girls. How many boys are there?
  23. 23.? − 118 = 148
  24. 24.339 + 270 =
  25. 25.A train has 161 people in the front coaches and 478 people in the back coaches. How many people are on the train?
  26. 26.465 − ? = 36
  27. 27.759 + 181 =
  28. 28.934 − 474 =
  29. 29.? − 170 = 490
  30. 30.A school has 885 children. 738 of them are girls. How many boys are there?
  31. 31.873 + ? = 987
  32. 32.301 − ? = 90
  33. 33.231 − 170 =
  34. 34.A school has 802 children. 503 of them are girls. How many boys are there?
  35. 35.612 − 278 =
  36. 36.126 + 440 =
  37. 37.? + 681 = 924
  38. 38.A train has 855 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  39. 39.A school has 548 children. 373 of them are girls. How many boys are there?
  40. 40.378 + 177 =

Answer key

  1. 333
  2. 273
  3. 169
  4. 496
  5. 492
  6. 796
  7. 560
  8. 667
  9. 930
  10. 60
  11. 760
  12. 357
  13. 243
  14. 63
  15. 16
  16. 969
  17. 99
  18. 169
  19. 818
  20. 819
  21. 517
  22. 3
  23. 266
  24. 609
  25. 639
  26. 429
  27. 940
  28. 460
  29. 660
  30. 147
  31. 114
  32. 211
  33. 61
  34. 299
  35. 334
  36. 566
  37. 243
  38. 970
  39. 175
  40. 555

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