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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 456 · 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 train has 748 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  2. 2.A school has 924 children. 615 of them are girls. How many boys are there?
  3. 3.361 − 259 =
  4. 4.A train has 230 people in the front coaches and 380 people in the back coaches. How many people are on the train?
  5. 5.? − 288 = 249
  6. 6.A school has 384 children. 361 of them are girls. How many boys are there?
  7. 7.738 + ? = 970
  8. 8.843 − 408 =
  9. 9.A school has 825 children. 160 of them are girls. How many boys are there?
  10. 10.A school has 638 children. 151 of them are girls. How many boys are there?
  11. 11.? + 127 = 810
  12. 12.904 − 710 =
  13. 13.A school has 388 children. 233 of them are girls. How many boys are there?
  14. 14.A train has 257 people in the front coaches and 707 people in the back coaches. How many people are on the train?
  15. 15.358 − 280 =
  16. 16.A train has 299 people in the front coaches and 181 people in the back coaches. How many people are on the train?
  17. 17.659 + 144 =
  18. 18.327 − 151 =
  19. 19.629 + 369 =
  20. 20.303 + 476 =
  21. 21.484 + 448 =
  22. 22.560 − 324 =
  23. 23.? + 232 = 463
  24. 24.234 − 163 =
  25. 25.A school has 422 children. 319 of them are girls. How many boys are there?
  26. 26.? + 316 = 740
  27. 27.? + 533 = 700
  28. 28.? − 205 = 102
  29. 29.356 + 482 =
  30. 30.387 + 226 =
  31. 31.830 − 358 =
  32. 32.A train has 640 people in the front coaches and 232 people in the back coaches. How many people are on the train?
  33. 33.? + 697 = 881
  34. 34.A school has 545 children. 455 of them are girls. How many boys are there?
  35. 35.928 − ? = 331
  36. 36.451 − 438 =
  37. 37.796 − 268 =
  38. 38.A school has 553 children. 492 of them are girls. How many boys are there?
  39. 39.? − 536 = 60
  40. 40.231 + 746 =

Answer key

  1. 919
  2. 309
  3. 102
  4. 610
  5. 537
  6. 23
  7. 232
  8. 435
  9. 665
  10. 487
  11. 683
  12. 194
  13. 155
  14. 964
  15. 78
  16. 480
  17. 803
  18. 176
  19. 998
  20. 779
  21. 932
  22. 236
  23. 231
  24. 71
  25. 103
  26. 424
  27. 167
  28. 307
  29. 838
  30. 613
  31. 472
  32. 872
  33. 184
  34. 90
  35. 597
  36. 13
  37. 528
  38. 61
  39. 596
  40. 977

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