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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 745 · 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.? + 582 = 765
  2. 2.427 + 156 =
  3. 3.707 − 108 =
  4. 4.A school has 394 children. 209 of them are girls. How many boys are there?
  5. 5.867 − 713 =
  6. 6.A school has 372 children. 283 of them are girls. How many boys are there?
  7. 7.618 − 607 =
  8. 8.? + 149 = 991
  9. 9.A train has 484 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  10. 10.680 + ? = 790
  11. 11.783 − ? = 108
  12. 12.? − 128 = 325
  13. 13.A school has 283 children. 193 of them are girls. How many boys are there?
  14. 14.? + 736 = 907
  15. 15.A train has 768 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  16. 16.537 − 456 =
  17. 17.441 + 312 =
  18. 18.940 − 677 =
  19. 19.864 + ? = 977
  20. 20.A school has 635 children. 516 of them are girls. How many boys are there?
  21. 21.245 − ? = 68
  22. 22.A train has 118 people in the front coaches and 840 people in the back coaches. How many people are on the train?
  23. 23.? + 368 = 832
  24. 24.371 − 215 =
  25. 25.513 + ? = 878
  26. 26.A train has 494 people in the front coaches and 212 people in the back coaches. How many people are on the train?
  27. 27.A train has 355 people in the front coaches and 398 people in the back coaches. How many people are on the train?
  28. 28.781 − ? = 386
  29. 29.618 + ? = 737
  30. 30.786 − 215 =
  31. 31.839 + ? = 943
  32. 32.? + 350 = 477
  33. 33.A school has 537 children. 378 of them are girls. How many boys are there?
  34. 34.638 − 322 =
  35. 35.? + 433 = 893
  36. 36.? − 192 = 527
  37. 37.A train has 361 people in the front coaches and 342 people in the back coaches. How many people are on the train?
  38. 38.808 − 654 =
  39. 39.? − 291 = 27
  40. 40.A train has 198 people in the front coaches and 108 people in the back coaches. How many people are on the train?

Answer key

  1. 183
  2. 583
  3. 599
  4. 185
  5. 154
  6. 89
  7. 11
  8. 842
  9. 785
  10. 110
  11. 675
  12. 453
  13. 90
  14. 171
  15. 949
  16. 81
  17. 753
  18. 263
  19. 113
  20. 119
  21. 177
  22. 958
  23. 464
  24. 156
  25. 365
  26. 706
  27. 753
  28. 395
  29. 119
  30. 571
  31. 104
  32. 127
  33. 159
  34. 316
  35. 460
  36. 719
  37. 703
  38. 154
  39. 318
  40. 306

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