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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 429 · 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.A school has 439 children. 427 of them are girls. How many boys are there?
  2. 2.422 − 343 =
  3. 3.? − 329 = 206
  4. 4.A school has 952 children. 100 of them are girls. How many boys are there?
  5. 5.303 + 588 =
  6. 6.654 − 230 =
  7. 7.575 − ? = 279
  8. 8.? + 567 = 812
  9. 9.236 − 161 =
  10. 10.A train has 644 people in the front coaches and 336 people in the back coaches. How many people are on the train?
  11. 11.? − 465 = 306
  12. 12.A school has 307 children. 294 of them are girls. How many boys are there?
  13. 13.? − 298 = 122
  14. 14.? − 563 = 88
  15. 15.284 − 198 =
  16. 16.? − 109 = 269
  17. 17.694 − 279 =
  18. 18.? + 642 = 902
  19. 19.? − 614 = 159
  20. 20.578 + ? = 809
  21. 21.? + 202 = 353
  22. 22.350 − 142 =
  23. 23.754 + 174 =
  24. 24.A school has 203 children. 187 of them are girls. How many boys are there?
  25. 25.344 − 159 =
  26. 26.237 − 119 =
  27. 27.873 − 324 =
  28. 28.210 + 684 =
  29. 29.A school has 575 children. 219 of them are girls. How many boys are there?
  30. 30.725 + 199 =
  31. 31.A school has 533 children. 479 of them are girls. How many boys are there?
  32. 32.324 + 180 =
  33. 33.418 − 168 =
  34. 34.A train has 594 people in the front coaches and 201 people in the back coaches. How many people are on the train?
  35. 35.654 + ? = 966
  36. 36.? − 132 = 178
  37. 37.A train has 633 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  38. 38.? + 306 = 651
  39. 39.700 + 116 =
  40. 40.? + 374 = 715

Answer key

  1. 12
  2. 79
  3. 535
  4. 852
  5. 891
  6. 424
  7. 296
  8. 245
  9. 75
  10. 980
  11. 771
  12. 13
  13. 420
  14. 651
  15. 86
  16. 378
  17. 415
  18. 260
  19. 773
  20. 231
  21. 151
  22. 208
  23. 928
  24. 16
  25. 185
  26. 118
  27. 549
  28. 894
  29. 356
  30. 924
  31. 54
  32. 504
  33. 250
  34. 795
  35. 312
  36. 310
  37. 741
  38. 345
  39. 816
  40. 341

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