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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 247 · 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 train has 272 people in the front coaches and 714 people in the back coaches. How many people are on the train?
  2. 2.? − 320 = 626
  3. 3.873 + ? = 981
  4. 4.A train has 511 people in the front coaches and 481 people in the back coaches. How many people are on the train?
  5. 5.? + 842 = 975
  6. 6.? + 375 = 706
  7. 7.584 − 551 =
  8. 8.756 − ? = 595
  9. 9.982 − 646 =
  10. 10.491 + 449 =
  11. 11.710 + ? = 866
  12. 12.437 + 539 =
  13. 13.? + 196 = 394
  14. 14.563 + ? = 878
  15. 15.333 − 170 =
  16. 16.? − 167 = 561
  17. 17.A school has 941 children. 246 of them are girls. How many boys are there?
  18. 18.A school has 204 children. 129 of them are girls. How many boys are there?
  19. 19.860 + ? = 961
  20. 20.681 + ? = 895
  21. 21.A train has 242 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  22. 22.803 − 683 =
  23. 23.232 − 189 =
  24. 24.? − 283 = 70
  25. 25.A school has 314 children. 310 of them are girls. How many boys are there?
  26. 26.773 + 104 =
  27. 27.A school has 790 children. 686 of them are girls. How many boys are there?
  28. 28.A train has 326 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  29. 29.110 + 495 =
  30. 30.A school has 492 children. 215 of them are girls. How many boys are there?
  31. 31.A school has 737 children. 530 of them are girls. How many boys are there?
  32. 32.176 + ? = 634
  33. 33.283 + 380 =
  34. 34.357 − ? = 3
  35. 35.585 + 167 =
  36. 36.? − 380 = 172
  37. 37.A train has 238 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  38. 38.A school has 545 children. 220 of them are girls. How many boys are there?
  39. 39.? − 545 = 240
  40. 40.A school has 659 children. 344 of them are girls. How many boys are there?

Answer key

  1. 986
  2. 946
  3. 108
  4. 992
  5. 133
  6. 331
  7. 33
  8. 161
  9. 336
  10. 940
  11. 156
  12. 976
  13. 198
  14. 315
  15. 163
  16. 728
  17. 695
  18. 75
  19. 101
  20. 214
  21. 441
  22. 120
  23. 43
  24. 353
  25. 4
  26. 877
  27. 104
  28. 427
  29. 605
  30. 277
  31. 207
  32. 458
  33. 663
  34. 354
  35. 752
  36. 552
  37. 491
  38. 325
  39. 785
  40. 315

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