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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 855 · 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. 1.365 + ? = 869
  2. 2.? + 461 = 988
  3. 3.728 − 392 =
  4. 4.A school has 327 children. 154 of them are girls. How many boys are there?
  5. 5.A school has 347 children. 124 of them are girls. How many boys are there?
  6. 6.860 + ? = 996
  7. 7.A school has 822 children. 631 of them are girls. How many boys are there?
  8. 8.A train has 310 people in the front coaches and 440 people in the back coaches. How many people are on the train?
  9. 9.520 − ? = 263
  10. 10.A school has 978 children. 528 of them are girls. How many boys are there?
  11. 11.A train has 832 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  12. 12.382 − 251 =
  13. 13.342 − 227 =
  14. 14.? − 220 = 53
  15. 15.497 − 220 =
  16. 16.202 − 153 =
  17. 17.698 + 164 =
  18. 18.? − 135 = 82
  19. 19.174 + 430 =
  20. 20.727 + 206 =
  21. 21.A school has 954 children. 298 of them are girls. How many boys are there?
  22. 22.838 − 227 =
  23. 23.496 + 121 =
  24. 24.A school has 634 children. 401 of them are girls. How many boys are there?
  25. 25.775 − ? = 548
  26. 26.507 − ? = 287
  27. 27.660 + 258 =
  28. 28.443 − 382 =
  29. 29.238 − 157 =
  30. 30.247 − 226 =
  31. 31.? − 124 = 112
  32. 32.? − 145 = 404
  33. 33.A train has 776 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  34. 34.A train has 583 people in the front coaches and 407 people in the back coaches. How many people are on the train?
  35. 35.115 + 758 =
  36. 36.805 − ? = 692
  37. 37.627 − 322 =
  38. 38.A train has 336 people in the front coaches and 127 people in the back coaches. How many people are on the train?
  39. 39.284 + 614 =
  40. 40.245 − 115 =

Answer key

  1. 504
  2. 527
  3. 336
  4. 173
  5. 223
  6. 136
  7. 191
  8. 750
  9. 257
  10. 450
  11. 943
  12. 131
  13. 115
  14. 273
  15. 277
  16. 49
  17. 862
  18. 217
  19. 604
  20. 933
  21. 656
  22. 611
  23. 617
  24. 233
  25. 227
  26. 220
  27. 918
  28. 61
  29. 81
  30. 21
  31. 236
  32. 549
  33. 990
  34. 990
  35. 873
  36. 113
  37. 305
  38. 463
  39. 898
  40. 130

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