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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 720 · 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 954 children. 826 of them are girls. How many boys are there?
  2. 2.568 − 143 =
  3. 3.? − 156 = 163
  4. 4.499 − ? = 200
  5. 5.321 − 156 =
  6. 6.712 + 139 =
  7. 7.679 − 295 =
  8. 8.A school has 682 children. 523 of them are girls. How many boys are there?
  9. 9.A train has 829 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  10. 10.223 − ? = 42
  11. 11.532 − 178 =
  12. 12.434 + ? = 764
  13. 13.A train has 268 people in the front coaches and 718 people in the back coaches. How many people are on the train?
  14. 14.A train has 305 people in the front coaches and 663 people in the back coaches. How many people are on the train?
  15. 15.223 − ? = 40
  16. 16.608 + ? = 808
  17. 17.? − 316 = 42
  18. 18.244 + ? = 467
  19. 19.A school has 205 children. 166 of them are girls. How many boys are there?
  20. 20.A train has 224 people in the front coaches and 615 people in the back coaches. How many people are on the train?
  21. 21.536 + 181 =
  22. 22.264 + 276 =
  23. 23.A train has 419 people in the front coaches and 185 people in the back coaches. How many people are on the train?
  24. 24.189 + 277 =
  25. 25.A school has 847 children. 148 of them are girls. How many boys are there?
  26. 26.777 − ? = 45
  27. 27.A school has 858 children. 279 of them are girls. How many boys are there?
  28. 28.441 − 249 =
  29. 29.249 + ? = 684
  30. 30.521 + 368 =
  31. 31.A school has 935 children. 694 of them are girls. How many boys are there?
  32. 32.511 + ? = 747
  33. 33.795 − ? = 397
  34. 34.503 − 466 =
  35. 35.126 + 280 =
  36. 36.790 − 108 =
  37. 37.282 − 163 =
  38. 38.? − 453 = 350
  39. 39.893 + 105 =
  40. 40.A train has 679 people in the front coaches and 154 people in the back coaches. How many people are on the train?

Answer key

  1. 128
  2. 425
  3. 319
  4. 299
  5. 165
  6. 851
  7. 384
  8. 159
  9. 959
  10. 181
  11. 354
  12. 330
  13. 986
  14. 968
  15. 183
  16. 200
  17. 358
  18. 223
  19. 39
  20. 839
  21. 717
  22. 540
  23. 604
  24. 466
  25. 699
  26. 732
  27. 579
  28. 192
  29. 435
  30. 889
  31. 241
  32. 236
  33. 398
  34. 37
  35. 406
  36. 682
  37. 119
  38. 803
  39. 998
  40. 833

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