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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 631 · 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. 1.603 − 238 =
  2. 2.A school has 577 children. 346 of them are girls. How many boys are there?
  3. 3.542 − ? = 406
  4. 4.A school has 479 children. 475 of them are girls. How many boys are there?
  5. 5.? + 387 = 911
  6. 6.A school has 520 children. 153 of them are girls. How many boys are there?
  7. 7.153 + 643 =
  8. 8.349 − 296 =
  9. 9.264 − 223 =
  10. 10.797 + 181 =
  11. 11.A school has 945 children. 302 of them are girls. How many boys are there?
  12. 12.A train has 525 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  13. 13.365 − 212 =
  14. 14.A train has 200 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  15. 15.? − 373 = 559
  16. 16.852 − 376 =
  17. 17.? − 357 = 233
  18. 18.496 − 102 =
  19. 19.A train has 858 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  20. 20.585 − ? = 174
  21. 21.? + 100 = 227
  22. 22.? − 153 = 94
  23. 23.405 − ? = 112
  24. 24.454 + 154 =
  25. 25.286 − 149 =
  26. 26.970 − 944 =
  27. 27.297 − 252 =
  28. 28.481 + 367 =
  29. 29.A school has 236 children. 141 of them are girls. How many boys are there?
  30. 30.211 − 164 =
  31. 31.A school has 899 children. 868 of them are girls. How many boys are there?
  32. 32.158 + 336 =
  33. 33.A train has 717 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  34. 34.591 − ? = 370
  35. 35.604 − 241 =
  36. 36.750 − 290 =
  37. 37.211 − 108 =
  38. 38.954 − 193 =
  39. 39.A train has 651 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  40. 40.A school has 307 children. 178 of them are girls. How many boys are there?

Answer key

  1. 365
  2. 231
  3. 136
  4. 4
  5. 524
  6. 367
  7. 796
  8. 53
  9. 41
  10. 978
  11. 643
  12. 869
  13. 153
  14. 597
  15. 932
  16. 476
  17. 590
  18. 394
  19. 986
  20. 411
  21. 127
  22. 247
  23. 293
  24. 608
  25. 137
  26. 26
  27. 45
  28. 848
  29. 95
  30. 47
  31. 31
  32. 494
  33. 888
  34. 221
  35. 363
  36. 460
  37. 103
  38. 761
  39. 772
  40. 129

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