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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 538 · 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. 1.834 + 103 =
  2. 2.576 − 288 =
  3. 3.690 + 229 =
  4. 4.386 − 148 =
  5. 5.A train has 202 people in the front coaches and 480 people in the back coaches. How many people are on the train?
  6. 6.A train has 337 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  7. 7.278 − ? = 111
  8. 8.220 − 178 =
  9. 9.A train has 315 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  10. 10.563 − 139 =
  11. 11.A school has 254 children. 192 of them are girls. How many boys are there?
  12. 12.884 + 107 =
  13. 13.600 − 493 =
  14. 14.257 − 105 =
  15. 15.597 − 257 =
  16. 16.A school has 246 children. 238 of them are girls. How many boys are there?
  17. 17.A train has 500 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  18. 18.896 − 444 =
  19. 19.A train has 629 people in the front coaches and 236 people in the back coaches. How many people are on the train?
  20. 20.111 + 151 =
  21. 21.309 − 219 =
  22. 22.850 + 121 =
  23. 23.217 + ? = 333
  24. 24.852 − ? = 416
  25. 25.979 − ? = 725
  26. 26.726 − 474 =
  27. 27.520 + 259 =
  28. 28.194 + ? = 452
  29. 29.604 − ? = 263
  30. 30.956 − ? = 261
  31. 31.? + 171 = 536
  32. 32.A train has 721 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  33. 33.809 + 155 =
  34. 34.355 − 286 =
  35. 35.A school has 663 children. 225 of them are girls. How many boys are there?
  36. 36.338 − 242 =
  37. 37.292 + ? = 393
  38. 38.988 − 285 =
  39. 39.437 + 290 =
  40. 40.701 − ? = 50

Answer key

  1. 937
  2. 288
  3. 919
  4. 238
  5. 682
  6. 502
  7. 167
  8. 42
  9. 478
  10. 424
  11. 62
  12. 991
  13. 107
  14. 152
  15. 340
  16. 8
  17. 605
  18. 452
  19. 865
  20. 262
  21. 90
  22. 971
  23. 116
  24. 436
  25. 254
  26. 252
  27. 779
  28. 258
  29. 341
  30. 695
  31. 365
  32. 937
  33. 964
  34. 69
  35. 438
  36. 96
  37. 101
  38. 703
  39. 727
  40. 651

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