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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 403 · 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. 1.597 − 317 =
  2. 2.549 − 115 =
  3. 3.598 − 458 =
  4. 4.? + 889 = 994
  5. 5.155 + 107 =
  6. 6.779 − 194 =
  7. 7.306 − ? = 183
  8. 8.508 − ? = 18
  9. 9.? − 721 = 99
  10. 10.802 − 474 =
  11. 11.A school has 979 children. 294 of them are girls. How many boys are there?
  12. 12.312 − ? = 155
  13. 13.492 − 277 =
  14. 14.A train has 660 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  15. 15.791 + 180 =
  16. 16.213 + 145 =
  17. 17.978 − ? = 434
  18. 18.223 − 138 =
  19. 19.A train has 367 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  20. 20.A school has 354 children. 247 of them are girls. How many boys are there?
  21. 21.A school has 864 children. 491 of them are girls. How many boys are there?
  22. 22.388 + ? = 519
  23. 23.583 + 190 =
  24. 24.A school has 873 children. 748 of them are girls. How many boys are there?
  25. 25.? + 576 = 899
  26. 26.? − 312 = 498
  27. 27.? + 411 = 724
  28. 28.748 + 223 =
  29. 29.875 + ? = 989
  30. 30.A school has 363 children. 295 of them are girls. How many boys are there?
  31. 31.? − 177 = 117
  32. 32.A school has 652 children. 457 of them are girls. How many boys are there?
  33. 33.629 − 153 =
  34. 34.? + 526 = 860
  35. 35.A school has 714 children. 412 of them are girls. How many boys are there?
  36. 36.755 + ? = 860
  37. 37.281 − 188 =
  38. 38.407 − 299 =
  39. 39.400 − 399 =
  40. 40.197 + ? = 870

Answer key

  1. 280
  2. 434
  3. 140
  4. 105
  5. 262
  6. 585
  7. 123
  8. 490
  9. 820
  10. 328
  11. 685
  12. 157
  13. 215
  14. 961
  15. 971
  16. 358
  17. 544
  18. 85
  19. 534
  20. 107
  21. 373
  22. 131
  23. 773
  24. 125
  25. 323
  26. 810
  27. 313
  28. 971
  29. 114
  30. 68
  31. 294
  32. 195
  33. 476
  34. 334
  35. 302
  36. 105
  37. 93
  38. 108
  39. 1
  40. 673

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