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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 469 · 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. 1.929 − ? = 742
  2. 2.A school has 733 children. 698 of them are girls. How many boys are there?
  3. 3.585 + 202 =
  4. 4.761 − ? = 621
  5. 5.383 − 367 =
  6. 6.332 + 480 =
  7. 7.725 − 586 =
  8. 8.A school has 352 children. 226 of them are girls. How many boys are there?
  9. 9.A school has 363 children. 211 of them are girls. How many boys are there?
  10. 10.436 − ? = 292
  11. 11.A school has 723 children. 198 of them are girls. How many boys are there?
  12. 12.A school has 565 children. 439 of them are girls. How many boys are there?
  13. 13.? − 354 = 24
  14. 14.828 − ? = 156
  15. 15.911 − ? = 415
  16. 16.476 + 271 =
  17. 17.909 − 784 =
  18. 18.? + 787 = 984
  19. 19.A school has 851 children. 831 of them are girls. How many boys are there?
  20. 20.900 − ? = 527
  21. 21.637 − 201 =
  22. 22.A school has 817 children. 592 of them are girls. How many boys are there?
  23. 23.A school has 857 children. 567 of them are girls. How many boys are there?
  24. 24.554 + ? = 940
  25. 25.563 − 235 =
  26. 26.322 + 400 =
  27. 27.A train has 598 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  28. 28.511 + 117 =
  29. 29.A train has 331 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  30. 30.645 + 133 =
  31. 31.? − 279 = 6
  32. 32.617 + ? = 878
  33. 33.A train has 791 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  34. 34.480 − 406 =
  35. 35.? + 576 = 705
  36. 36.A train has 757 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  37. 37.303 − ? = 101
  38. 38.106 + 884 =
  39. 39.246 + 292 =
  40. 40.774 − 272 =

Answer key

  1. 187
  2. 35
  3. 787
  4. 140
  5. 16
  6. 812
  7. 139
  8. 126
  9. 152
  10. 144
  11. 525
  12. 126
  13. 378
  14. 672
  15. 496
  16. 747
  17. 125
  18. 197
  19. 20
  20. 373
  21. 436
  22. 225
  23. 290
  24. 386
  25. 328
  26. 722
  27. 749
  28. 628
  29. 433
  30. 778
  31. 285
  32. 261
  33. 933
  34. 74
  35. 129
  36. 875
  37. 202
  38. 990
  39. 538
  40. 502

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