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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 651 · 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.? + 401 = 708
  2. 2.301 + ? = 834
  3. 3.? + 654 = 845
  4. 4.502 + ? = 781
  5. 5.222 + 324 =
  6. 6.A school has 555 children. 178 of them are girls. How many boys are there?
  7. 7.236 − 184 =
  8. 8.A train has 344 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  9. 9.A train has 359 people in the front coaches and 593 people in the back coaches. How many people are on the train?
  10. 10.A school has 285 children. 140 of them are girls. How many boys are there?
  11. 11.553 + 318 =
  12. 12.120 + 438 =
  13. 13.574 − 424 =
  14. 14.243 − 101 =
  15. 15.623 − 437 =
  16. 16.241 + 299 =
  17. 17.349 + ? = 792
  18. 18.885 − 472 =
  19. 19.? − 503 = 438
  20. 20.A train has 317 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  21. 21.259 − 108 =
  22. 22.570 + 221 =
  23. 23.857 − 456 =
  24. 24.162 + 151 =
  25. 25.403 − 357 =
  26. 26.148 + 245 =
  27. 27.411 + 568 =
  28. 28.A train has 328 people in the front coaches and 383 people in the back coaches. How many people are on the train?
  29. 29.566 + 348 =
  30. 30.602 + ? = 750
  31. 31.235 − 105 =
  32. 32.? − 276 = 11
  33. 33.A school has 273 children. 186 of them are girls. How many boys are there?
  34. 34.589 − 311 =
  35. 35.A school has 745 children. 710 of them are girls. How many boys are there?
  36. 36.648 − 474 =
  37. 37.A train has 474 people in the front coaches and 333 people in the back coaches. How many people are on the train?
  38. 38.A train has 680 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  39. 39.A train has 749 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  40. 40.? − 148 = 281

Answer key

  1. 307
  2. 533
  3. 191
  4. 279
  5. 546
  6. 377
  7. 52
  8. 814
  9. 952
  10. 145
  11. 871
  12. 558
  13. 150
  14. 142
  15. 186
  16. 540
  17. 443
  18. 413
  19. 941
  20. 581
  21. 151
  22. 791
  23. 401
  24. 313
  25. 46
  26. 393
  27. 979
  28. 711
  29. 914
  30. 148
  31. 130
  32. 287
  33. 87
  34. 278
  35. 35
  36. 174
  37. 807
  38. 931
  39. 920
  40. 429

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