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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 226 · 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. 1.218 + 629 =
  2. 2.402 + 292 =
  3. 3.481 + 120 =
  4. 4.A school has 675 children. 193 of them are girls. How many boys are there?
  5. 5.371 − ? = 162
  6. 6.A train has 647 people in the front coaches and 332 people in the back coaches. How many people are on the train?
  7. 7.620 − 135 =
  8. 8.244 − 192 =
  9. 9.A school has 819 children. 497 of them are girls. How many boys are there?
  10. 10.515 − ? = 45
  11. 11.581 − 147 =
  12. 12.823 + 108 =
  13. 13.279 + 410 =
  14. 14.272 − ? = 91
  15. 15.A train has 243 people in the front coaches and 630 people in the back coaches. How many people are on the train?
  16. 16.A train has 239 people in the front coaches and 466 people in the back coaches. How many people are on the train?
  17. 17.? + 899 = 999
  18. 18.? + 325 = 942
  19. 19.767 − 279 =
  20. 20.637 − 149 =
  21. 21.A train has 471 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  22. 22.391 + 311 =
  23. 23.250 + 280 =
  24. 24.? + 657 = 900
  25. 25.A school has 968 children. 589 of them are girls. How many boys are there?
  26. 26.A school has 935 children. 189 of them are girls. How many boys are there?
  27. 27.482 − ? = 299
  28. 28.A school has 333 children. 134 of them are girls. How many boys are there?
  29. 29.221 + 239 =
  30. 30.A train has 583 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  31. 31.222 + 494 =
  32. 32.142 + 370 =
  33. 33.? − 134 = 165
  34. 34.684 + 169 =
  35. 35.A school has 836 children. 152 of them are girls. How many boys are there?
  36. 36.A school has 953 children. 350 of them are girls. How many boys are there?
  37. 37.596 + ? = 740
  38. 38.371 − ? = 222
  39. 39.851 − 260 =
  40. 40.? + 704 = 995

Answer key

  1. 847
  2. 694
  3. 601
  4. 482
  5. 209
  6. 979
  7. 485
  8. 52
  9. 322
  10. 470
  11. 434
  12. 931
  13. 689
  14. 181
  15. 873
  16. 705
  17. 100
  18. 617
  19. 488
  20. 488
  21. 747
  22. 702
  23. 530
  24. 243
  25. 379
  26. 746
  27. 183
  28. 199
  29. 460
  30. 739
  31. 716
  32. 512
  33. 299
  34. 853
  35. 684
  36. 603
  37. 144
  38. 149
  39. 591
  40. 291

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