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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 205 · 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. 1.808 + 180 =
  2. 2.318 + 647 =
  3. 3.190 + 645 =
  4. 4.508 + 370 =
  5. 5.A train has 888 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  6. 6.A school has 757 children. 486 of them are girls. How many boys are there?
  7. 7.A train has 141 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  8. 8.223 + ? = 602
  9. 9.180 + ? = 709
  10. 10.488 + 463 =
  11. 11.? + 571 = 983
  12. 12.290 + 560 =
  13. 13.? − 563 = 7
  14. 14.306 + 140 =
  15. 15.240 + 533 =
  16. 16.A train has 588 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  17. 17.A train has 177 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  18. 18.? + 525 = 701
  19. 19.A train has 323 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  20. 20.736 − 402 =
  21. 21.823 − ? = 279
  22. 22.A train has 812 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  23. 23.531 − 340 =
  24. 24.148 + 363 =
  25. 25.? + 525 = 946
  26. 26.A train has 173 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  27. 27.A train has 122 people in the front coaches and 670 people in the back coaches. How many people are on the train?
  28. 28.285 + 159 =
  29. 29.435 − ? = 142
  30. 30.A train has 205 people in the front coaches and 204 people in the back coaches. How many people are on the train?
  31. 31.? + 512 = 880
  32. 32.288 + 227 =
  33. 33.A train has 280 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  34. 34.654 − 163 =
  35. 35.479 + 284 =
  36. 36.724 − 202 =
  37. 37.571 − 355 =
  38. 38.627 + 130 =
  39. 39.? − 437 = 74
  40. 40.592 − ? = 312

Answer key

  1. 988
  2. 965
  3. 835
  4. 878
  5. 989
  6. 271
  7. 376
  8. 379
  9. 529
  10. 951
  11. 412
  12. 850
  13. 570
  14. 446
  15. 773
  16. 941
  17. 298
  18. 176
  19. 560
  20. 334
  21. 544
  22. 998
  23. 191
  24. 511
  25. 421
  26. 294
  27. 792
  28. 444
  29. 293
  30. 409
  31. 368
  32. 515
  33. 424
  34. 491
  35. 763
  36. 522
  37. 216
  38. 757
  39. 511
  40. 280

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