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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 620 · 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.? + 271 = 432
  2. 2.674 − ? = 22
  3. 3.? − 209 = 194
  4. 4.A train has 342 people in the front coaches and 408 people in the back coaches. How many people are on the train?
  5. 5.194 + 446 =
  6. 6.A train has 877 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  7. 7.? − 408 = 115
  8. 8.A train has 646 people in the front coaches and 351 people in the back coaches. How many people are on the train?
  9. 9.821 + 136 =
  10. 10.296 − 169 =
  11. 11.291 − ? = 113
  12. 12.548 − ? = 239
  13. 13.387 + 299 =
  14. 14.722 − ? = 73
  15. 15.253 − 198 =
  16. 16.? − 149 = 275
  17. 17.A school has 877 children. 713 of them are girls. How many boys are there?
  18. 18.A train has 670 people in the front coaches and 174 people in the back coaches. How many people are on the train?
  19. 19.318 − ? = 43
  20. 20.469 − ? = 294
  21. 21.778 − ? = 667
  22. 22.294 + ? = 928
  23. 23.A school has 984 children. 805 of them are girls. How many boys are there?
  24. 24.477 + 222 =
  25. 25.227 + ? = 593
  26. 26.393 + ? = 661
  27. 27.277 − 135 =
  28. 28.721 − ? = 270
  29. 29.A school has 419 children. 382 of them are girls. How many boys are there?
  30. 30.A train has 432 people in the front coaches and 484 people in the back coaches. How many people are on the train?
  31. 31.717 − 670 =
  32. 32.A train has 625 people in the front coaches and 274 people in the back coaches. How many people are on the train?
  33. 33.A school has 695 children. 216 of them are girls. How many boys are there?
  34. 34.A school has 291 children. 181 of them are girls. How many boys are there?
  35. 35.A school has 394 children. 315 of them are girls. How many boys are there?
  36. 36.123 + ? = 238
  37. 37.A train has 290 people in the front coaches and 372 people in the back coaches. How many people are on the train?
  38. 38.642 + 186 =
  39. 39.? + 840 = 958
  40. 40.445 − 190 =

Answer key

  1. 161
  2. 652
  3. 403
  4. 750
  5. 640
  6. 993
  7. 523
  8. 997
  9. 957
  10. 127
  11. 178
  12. 309
  13. 686
  14. 649
  15. 55
  16. 424
  17. 164
  18. 844
  19. 275
  20. 175
  21. 111
  22. 634
  23. 179
  24. 699
  25. 366
  26. 268
  27. 142
  28. 451
  29. 37
  30. 916
  31. 47
  32. 899
  33. 479
  34. 110
  35. 79
  36. 115
  37. 662
  38. 828
  39. 118
  40. 255

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