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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 411 · 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. 1.257 − 127 =
  2. 2.A train has 173 people in the front coaches and 624 people in the back coaches. How many people are on the train?
  3. 3.306 − ? = 75
  4. 4.841 + ? = 981
  5. 5.278 − 173 =
  6. 6.536 − 258 =
  7. 7.225 − ? = 112
  8. 8.685 − ? = 574
  9. 9.208 + 678 =
  10. 10.518 − ? = 120
  11. 11.A train has 813 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  12. 12.528 + 275 =
  13. 13.547 + ? = 938
  14. 14.563 + ? = 707
  15. 15.267 + ? = 375
  16. 16.A school has 482 children. 246 of them are girls. How many boys are there?
  17. 17.? − 229 = 109
  18. 18.A school has 487 children. 415 of them are girls. How many boys are there?
  19. 19.A school has 741 children. 168 of them are girls. How many boys are there?
  20. 20.A train has 713 people in the front coaches and 190 people in the back coaches. How many people are on the train?
  21. 21.384 + 148 =
  22. 22.? + 156 = 610
  23. 23.470 + 340 =
  24. 24.212 − ? = 22
  25. 25.994 − 842 =
  26. 26.357 + ? = 797
  27. 27.A school has 280 children. 273 of them are girls. How many boys are there?
  28. 28.A school has 321 children. 119 of them are girls. How many boys are there?
  29. 29.A school has 542 children. 453 of them are girls. How many boys are there?
  30. 30.A school has 615 children. 326 of them are girls. How many boys are there?
  31. 31.A train has 860 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  32. 32.246 + 550 =
  33. 33.? − 278 = 383
  34. 34.139 + 608 =
  35. 35.329 + 261 =
  36. 36.515 − 173 =
  37. 37.420 + 402 =
  38. 38.? + 747 = 963
  39. 39.659 − 237 =
  40. 40.A school has 679 children. 538 of them are girls. How many boys are there?

Answer key

  1. 130
  2. 797
  3. 231
  4. 140
  5. 105
  6. 278
  7. 113
  8. 111
  9. 886
  10. 398
  11. 928
  12. 803
  13. 391
  14. 144
  15. 108
  16. 236
  17. 338
  18. 72
  19. 573
  20. 903
  21. 532
  22. 454
  23. 810
  24. 190
  25. 152
  26. 440
  27. 7
  28. 202
  29. 89
  30. 289
  31. 973
  32. 796
  33. 661
  34. 747
  35. 590
  36. 342
  37. 822
  38. 216
  39. 422
  40. 141

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