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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 794 · 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. 1.699 + ? = 957
  2. 2.A school has 606 children. 431 of them are girls. How many boys are there?
  3. 3.? + 686 = 864
  4. 4.A train has 413 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  5. 5.178 + 741 =
  6. 6.190 + ? = 383
  7. 7.? − 128 = 346
  8. 8.A school has 237 children. 146 of them are girls. How many boys are there?
  9. 9.? − 788 = 162
  10. 10.676 − ? = 45
  11. 11.540 − 284 =
  12. 12.A school has 507 children. 427 of them are girls. How many boys are there?
  13. 13.? + 403 = 725
  14. 14.935 − 230 =
  15. 15.A school has 404 children. 366 of them are girls. How many boys are there?
  16. 16.145 + 493 =
  17. 17.A school has 581 children. 305 of them are girls. How many boys are there?
  18. 18.198 + 369 =
  19. 19.282 − 140 =
  20. 20.755 + ? = 908
  21. 21.676 + 311 =
  22. 22.248 − 175 =
  23. 23.508 − ? = 85
  24. 24.624 − ? = 164
  25. 25.660 + 241 =
  26. 26.274 − ? = 71
  27. 27.A train has 793 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  28. 28.A train has 732 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  29. 29.? − 151 = 168
  30. 30.806 − ? = 418
  31. 31.964 − 660 =
  32. 32.A train has 247 people in the front coaches and 380 people in the back coaches. How many people are on the train?
  33. 33.363 − ? = 215
  34. 34.501 + ? = 705
  35. 35.153 + ? = 840
  36. 36.A school has 843 children. 146 of them are girls. How many boys are there?
  37. 37.242 + 665 =
  38. 38.A school has 475 children. 170 of them are girls. How many boys are there?
  39. 39.A school has 663 children. 194 of them are girls. How many boys are there?
  40. 40.206 + 456 =

Answer key

  1. 258
  2. 175
  3. 178
  4. 784
  5. 919
  6. 193
  7. 474
  8. 91
  9. 950
  10. 631
  11. 256
  12. 80
  13. 322
  14. 705
  15. 38
  16. 638
  17. 276
  18. 567
  19. 142
  20. 153
  21. 987
  22. 73
  23. 423
  24. 460
  25. 901
  26. 203
  27. 930
  28. 923
  29. 319
  30. 388
  31. 304
  32. 627
  33. 148
  34. 204
  35. 687
  36. 697
  37. 907
  38. 305
  39. 469
  40. 662

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