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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 967 · 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. 1.875 + 115 =
  2. 2.A school has 694 children. 583 of them are girls. How many boys are there?
  3. 3.A train has 423 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  4. 4.A train has 785 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  5. 5.? − 605 = 108
  6. 6.? + 279 = 556
  7. 7.625 + 169 =
  8. 8.A train has 415 people in the front coaches and 532 people in the back coaches. How many people are on the train?
  9. 9.286 − 106 =
  10. 10.730 − ? = 330
  11. 11.? − 452 = 305
  12. 12.776 − ? = 487
  13. 13.793 − ? = 641
  14. 14.A school has 357 children. 277 of them are girls. How many boys are there?
  15. 15.A train has 630 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  16. 16.A school has 780 children. 711 of them are girls. How many boys are there?
  17. 17.? + 662 = 870
  18. 18.273 + 371 =
  19. 19.226 − 132 =
  20. 20.253 + ? = 722
  21. 21.732 + 184 =
  22. 22.169 + 728 =
  23. 23.A school has 370 children. 299 of them are girls. How many boys are there?
  24. 24.855 − 279 =
  25. 25.688 − 426 =
  26. 26.610 + 156 =
  27. 27.? + 113 = 620
  28. 28.122 + ? = 247
  29. 29.884 − 476 =
  30. 30.274 − 265 =
  31. 31.A school has 865 children. 362 of them are girls. How many boys are there?
  32. 32.387 + 564 =
  33. 33.572 − 364 =
  34. 34.614 − 296 =
  35. 35.178 + 609 =
  36. 36.A school has 415 children. 188 of them are girls. How many boys are there?
  37. 37.318 + 395 =
  38. 38.120 + 279 =
  39. 39.A train has 604 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  40. 40.735 + ? = 999

Answer key

  1. 990
  2. 111
  3. 842
  4. 946
  5. 713
  6. 277
  7. 794
  8. 947
  9. 180
  10. 400
  11. 757
  12. 289
  13. 152
  14. 80
  15. 765
  16. 69
  17. 208
  18. 644
  19. 94
  20. 469
  21. 916
  22. 897
  23. 71
  24. 576
  25. 262
  26. 766
  27. 507
  28. 125
  29. 408
  30. 9
  31. 503
  32. 951
  33. 208
  34. 318
  35. 787
  36. 227
  37. 713
  38. 399
  39. 711
  40. 264

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