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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 385 · 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. 1.235 + 738 =
  2. 2.299 − ? = 111
  3. 3.? − 152 = 426
  4. 4.A train has 237 people in the front coaches and 213 people in the back coaches. How many people are on the train?
  5. 5.906 − ? = 468
  6. 6.591 − 540 =
  7. 7.? + 126 = 305
  8. 8.660 − ? = 429
  9. 9.A train has 496 people in the front coaches and 484 people in the back coaches. How many people are on the train?
  10. 10.769 − 179 =
  11. 11.A school has 949 children. 354 of them are girls. How many boys are there?
  12. 12.284 − 139 =
  13. 13.267 − 236 =
  14. 14.546 − 463 =
  15. 15.A train has 678 people in the front coaches and 269 people in the back coaches. How many people are on the train?
  16. 16.583 + 292 =
  17. 17.A school has 240 children. 109 of them are girls. How many boys are there?
  18. 18.345 − 124 =
  19. 19.A school has 251 children. 179 of them are girls. How many boys are there?
  20. 20.483 + 337 =
  21. 21.A school has 523 children. 341 of them are girls. How many boys are there?
  22. 22.A school has 695 children. 140 of them are girls. How many boys are there?
  23. 23.204 + 250 =
  24. 24.A school has 268 children. 161 of them are girls. How many boys are there?
  25. 25.879 + 101 =
  26. 26.392 − 185 =
  27. 27.360 − 209 =
  28. 28.503 + ? = 926
  29. 29.383 − 315 =
  30. 30.263 + 604 =
  31. 31.A school has 700 children. 620 of them are girls. How many boys are there?
  32. 32.A school has 807 children. 202 of them are girls. How many boys are there?
  33. 33.500 − 332 =
  34. 34.? + 225 = 799
  35. 35.635 − ? = 458
  36. 36.A train has 102 people in the front coaches and 826 people in the back coaches. How many people are on the train?
  37. 37.334 − 251 =
  38. 38.? − 138 = 164
  39. 39.824 + ? = 967
  40. 40.A train has 707 people in the front coaches and 104 people in the back coaches. How many people are on the train?

Answer key

  1. 973
  2. 188
  3. 578
  4. 450
  5. 438
  6. 51
  7. 179
  8. 231
  9. 980
  10. 590
  11. 595
  12. 145
  13. 31
  14. 83
  15. 947
  16. 875
  17. 131
  18. 221
  19. 72
  20. 820
  21. 182
  22. 555
  23. 454
  24. 107
  25. 980
  26. 207
  27. 151
  28. 423
  29. 68
  30. 867
  31. 80
  32. 605
  33. 168
  34. 574
  35. 177
  36. 928
  37. 83
  38. 302
  39. 143
  40. 811

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