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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 354 · 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. 1.556 − ? = 396
  2. 2.150 + ? = 833
  3. 3.187 + ? = 502
  4. 4.582 − 435 =
  5. 5.286 + 534 =
  6. 6.A train has 571 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  7. 7.514 + 468 =
  8. 8.A train has 771 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  9. 9.A train has 556 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  10. 10.321 + 120 =
  11. 11.308 − ? = 38
  12. 12.A train has 189 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  13. 13.578 + 235 =
  14. 14.510 + ? = 611
  15. 15.654 + 151 =
  16. 16.440 + 266 =
  17. 17.A train has 306 people in the front coaches and 510 people in the back coaches. How many people are on the train?
  18. 18.294 + 377 =
  19. 19.714 − 397 =
  20. 20.812 − ? = 222
  21. 21.A train has 442 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  22. 22.207 + ? = 480
  23. 23.267 − ? = 152
  24. 24.593 + 111 =
  25. 25.A school has 710 children. 685 of them are girls. How many boys are there?
  26. 26.291 + 293 =
  27. 27.A school has 279 children. 189 of them are girls. How many boys are there?
  28. 28.257 − 164 =
  29. 29.? + 391 = 812
  30. 30.103 + ? = 904
  31. 31.282 − 187 =
  32. 32.501 − 419 =
  33. 33.278 + 257 =
  34. 34.A train has 291 people in the front coaches and 184 people in the back coaches. How many people are on the train?
  35. 35.475 − ? = 333
  36. 36.954 − 283 =
  37. 37.A train has 257 people in the front coaches and 617 people in the back coaches. How many people are on the train?
  38. 38.A school has 416 children. 267 of them are girls. How many boys are there?
  39. 39.A school has 565 children. 504 of them are girls. How many boys are there?
  40. 40.290 + ? = 777

Answer key

  1. 160
  2. 683
  3. 315
  4. 147
  5. 820
  6. 762
  7. 982
  8. 939
  9. 660
  10. 441
  11. 270
  12. 297
  13. 813
  14. 101
  15. 805
  16. 706
  17. 816
  18. 671
  19. 317
  20. 590
  21. 565
  22. 273
  23. 115
  24. 704
  25. 25
  26. 584
  27. 90
  28. 93
  29. 421
  30. 801
  31. 95
  32. 82
  33. 535
  34. 475
  35. 142
  36. 671
  37. 874
  38. 149
  39. 61
  40. 487

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