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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 282 · 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.A school has 903 children. 139 of them are girls. How many boys are there?
  2. 2.888 + ? = 998
  3. 3.489 − 370 =
  4. 4.478 − 440 =
  5. 5.545 − ? = 107
  6. 6.421 − 308 =
  7. 7.A school has 688 children. 224 of them are girls. How many boys are there?
  8. 8.419 + ? = 924
  9. 9.865 + 120 =
  10. 10.A train has 144 people in the front coaches and 489 people in the back coaches. How many people are on the train?
  11. 11.A train has 564 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  12. 12.745 + ? = 911
  13. 13.529 + 227 =
  14. 14.773 + 207 =
  15. 15.376 + 108 =
  16. 16.401 + ? = 802
  17. 17.A train has 473 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  18. 18.220 + 233 =
  19. 19.223 − ? = 70
  20. 20.732 + 138 =
  21. 21.A school has 675 children. 426 of them are girls. How many boys are there?
  22. 22.A train has 155 people in the front coaches and 390 people in the back coaches. How many people are on the train?
  23. 23.? + 778 = 988
  24. 24.230 − 116 =
  25. 25.A train has 286 people in the front coaches and 322 people in the back coaches. How many people are on the train?
  26. 26.A school has 752 children. 302 of them are girls. How many boys are there?
  27. 27.? + 679 = 826
  28. 28.403 − 287 =
  29. 29.371 − ? = 266
  30. 30.557 + 214 =
  31. 31.428 − 212 =
  32. 32.678 − 523 =
  33. 33.? − 430 = 39
  34. 34.? − 304 = 257
  35. 35.? − 574 = 29
  36. 36.A train has 131 people in the front coaches and 500 people in the back coaches. How many people are on the train?
  37. 37.304 − 226 =
  38. 38.A school has 980 children. 254 of them are girls. How many boys are there?
  39. 39.313 + 629 =
  40. 40.998 − 424 =

Answer key

  1. 764
  2. 110
  3. 119
  4. 38
  5. 438
  6. 113
  7. 464
  8. 505
  9. 985
  10. 633
  11. 870
  12. 166
  13. 756
  14. 980
  15. 484
  16. 401
  17. 758
  18. 453
  19. 153
  20. 870
  21. 249
  22. 545
  23. 210
  24. 114
  25. 608
  26. 450
  27. 147
  28. 116
  29. 105
  30. 771
  31. 216
  32. 155
  33. 469
  34. 561
  35. 603
  36. 631
  37. 78
  38. 726
  39. 942
  40. 574

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