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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 530 · 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. 1.212 + 110 =
  2. 2.365 − ? = 75
  3. 3.530 − 132 =
  4. 4.452 + 312 =
  5. 5.A school has 676 children. 553 of them are girls. How many boys are there?
  6. 6.553 − 307 =
  7. 7.? − 427 = 322
  8. 8.A train has 809 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  9. 9.A school has 904 children. 664 of them are girls. How many boys are there?
  10. 10.A train has 614 people in the front coaches and 169 people in the back coaches. How many people are on the train?
  11. 11.447 + 479 =
  12. 12.A school has 246 children. 242 of them are girls. How many boys are there?
  13. 13.544 + 324 =
  14. 14.A train has 754 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  15. 15.840 + ? = 945
  16. 16.? + 205 = 879
  17. 17.316 − 100 =
  18. 18.? + 557 = 865
  19. 19.A school has 422 children. 230 of them are girls. How many boys are there?
  20. 20.175 + 374 =
  21. 21.727 + ? = 861
  22. 22.A train has 770 people in the front coaches and 166 people in the back coaches. How many people are on the train?
  23. 23.? − 117 = 264
  24. 24.715 + 183 =
  25. 25.A school has 304 children. 141 of them are girls. How many boys are there?
  26. 26.998 − 558 =
  27. 27.? + 151 = 453
  28. 28.117 + ? = 227
  29. 29.A train has 662 people in the front coaches and 317 people in the back coaches. How many people are on the train?
  30. 30.469 + 132 =
  31. 31.663 − ? = 289
  32. 32.556 − 244 =
  33. 33.925 − 346 =
  34. 34.? + 291 = 573
  35. 35.398 − ? = 273
  36. 36.? + 739 = 850
  37. 37.564 − 253 =
  38. 38.A train has 718 people in the front coaches and 245 people in the back coaches. How many people are on the train?
  39. 39.? + 897 = 998
  40. 40.A school has 788 children. 637 of them are girls. How many boys are there?

Answer key

  1. 322
  2. 290
  3. 398
  4. 764
  5. 123
  6. 246
  7. 749
  8. 911
  9. 240
  10. 783
  11. 926
  12. 4
  13. 868
  14. 859
  15. 105
  16. 674
  17. 216
  18. 308
  19. 192
  20. 549
  21. 134
  22. 936
  23. 381
  24. 898
  25. 163
  26. 440
  27. 302
  28. 110
  29. 979
  30. 601
  31. 374
  32. 312
  33. 579
  34. 282
  35. 125
  36. 111
  37. 311
  38. 963
  39. 101
  40. 151

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