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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 479 · 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.? − 239 = 33
  2. 2.? + 284 = 614
  3. 3.A train has 311 people in the front coaches and 580 people in the back coaches. How many people are on the train?
  4. 4.A school has 985 children. 191 of them are girls. How many boys are there?
  5. 5.847 − 220 =
  6. 6.314 + 289 =
  7. 7.191 + 298 =
  8. 8.? − 588 = 408
  9. 9.582 + 192 =
  10. 10.308 − 273 =
  11. 11.? − 114 = 110
  12. 12.250 − 112 =
  13. 13.? − 121 = 476
  14. 14.695 + 208 =
  15. 15.399 + 500 =
  16. 16.784 + 196 =
  17. 17.827 − 509 =
  18. 18.936 − 112 =
  19. 19.334 + 160 =
  20. 20.527 − ? = 89
  21. 21.A school has 586 children. 392 of them are girls. How many boys are there?
  22. 22.A train has 101 people in the front coaches and 605 people in the back coaches. How many people are on the train?
  23. 23.826 − 354 =
  24. 24.A train has 327 people in the front coaches and 410 people in the back coaches. How many people are on the train?
  25. 25.581 + 402 =
  26. 26.A school has 644 children. 240 of them are girls. How many boys are there?
  27. 27.276 + 351 =
  28. 28.719 + 110 =
  29. 29.A school has 649 children. 249 of them are girls. How many boys are there?
  30. 30.413 + 220 =
  31. 31.A school has 772 children. 557 of them are girls. How many boys are there?
  32. 32.463 + 198 =
  33. 33.? + 780 = 992
  34. 34.? + 773 = 921
  35. 35.A train has 202 people in the front coaches and 538 people in the back coaches. How many people are on the train?
  36. 36.624 − ? = 239
  37. 37.A school has 863 children. 673 of them are girls. How many boys are there?
  38. 38.A school has 216 children. 203 of them are girls. How many boys are there?
  39. 39.? + 230 = 720
  40. 40.263 + 330 =

Answer key

  1. 272
  2. 330
  3. 891
  4. 794
  5. 627
  6. 603
  7. 489
  8. 996
  9. 774
  10. 35
  11. 224
  12. 138
  13. 597
  14. 903
  15. 899
  16. 980
  17. 318
  18. 824
  19. 494
  20. 438
  21. 194
  22. 706
  23. 472
  24. 737
  25. 983
  26. 404
  27. 627
  28. 829
  29. 400
  30. 633
  31. 215
  32. 661
  33. 212
  34. 148
  35. 740
  36. 385
  37. 190
  38. 13
  39. 490
  40. 593

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