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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 61 · 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.? − 200 = 611
  2. 2.417 + 525 =
  3. 3.399 + ? = 690
  4. 4.A train has 503 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  5. 5.291 − 152 =
  6. 6.A train has 856 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  7. 7.476 − ? = 83
  8. 8.A train has 837 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  9. 9.502 − 250 =
  10. 10.A train has 654 people in the front coaches and 213 people in the back coaches. How many people are on the train?
  11. 11.584 + 113 =
  12. 12.544 + 428 =
  13. 13.563 + ? = 664
  14. 14.? − 413 = 66
  15. 15.335 + ? = 873
  16. 16.? − 105 = 299
  17. 17.248 − ? = 11
  18. 18.440 + 377 =
  19. 19.? − 722 = 237
  20. 20.666 + ? = 875
  21. 21.? − 271 = 189
  22. 22.508 − 506 =
  23. 23.795 − 707 =
  24. 24.A school has 815 children. 254 of them are girls. How many boys are there?
  25. 25.400 − ? = 127
  26. 26.A school has 920 children. 502 of them are girls. How many boys are there?
  27. 27.A school has 693 children. 310 of them are girls. How many boys are there?
  28. 28.A train has 336 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  29. 29.907 − ? = 13
  30. 30.A school has 621 children. 250 of them are girls. How many boys are there?
  31. 31.583 − 565 =
  32. 32.A train has 175 people in the front coaches and 226 people in the back coaches. How many people are on the train?
  33. 33.A train has 155 people in the front coaches and 225 people in the back coaches. How many people are on the train?
  34. 34.A train has 229 people in the front coaches and 207 people in the back coaches. How many people are on the train?
  35. 35.921 − 717 =
  36. 36.A train has 726 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  37. 37.949 − ? = 377
  38. 38.A school has 987 children. 533 of them are girls. How many boys are there?
  39. 39.387 + 204 =
  40. 40.338 + ? = 957

Answer key

  1. 811
  2. 942
  3. 291
  4. 617
  5. 139
  6. 968
  7. 393
  8. 964
  9. 252
  10. 867
  11. 697
  12. 972
  13. 101
  14. 479
  15. 538
  16. 404
  17. 237
  18. 817
  19. 959
  20. 209
  21. 460
  22. 2
  23. 88
  24. 561
  25. 273
  26. 418
  27. 383
  28. 450
  29. 894
  30. 371
  31. 18
  32. 401
  33. 380
  34. 436
  35. 204
  36. 901
  37. 572
  38. 454
  39. 591
  40. 619

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