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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 644 · 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. 1.879 + ? = 991
  2. 2.988 − 159 =
  3. 3.A school has 816 children. 436 of them are girls. How many boys are there?
  4. 4.966 − 395 =
  5. 5.629 + ? = 751
  6. 6.559 + 387 =
  7. 7.? − 372 = 65
  8. 8.A train has 261 people in the front coaches and 623 people in the back coaches. How many people are on the train?
  9. 9.393 − 361 =
  10. 10.695 + 267 =
  11. 11.A school has 225 children. 147 of them are girls. How many boys are there?
  12. 12.653 + 197 =
  13. 13.A train has 482 people in the front coaches and 361 people in the back coaches. How many people are on the train?
  14. 14.A school has 323 children. 168 of them are girls. How many boys are there?
  15. 15.A train has 873 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  16. 16.757 − 394 =
  17. 17.? − 196 = 219
  18. 18.517 + 193 =
  19. 19.102 + 619 =
  20. 20.892 − 581 =
  21. 21.288 + 669 =
  22. 22.800 − 412 =
  23. 23.419 + 374 =
  24. 24.255 − 106 =
  25. 25.350 − ? = 212
  26. 26.112 + 541 =
  27. 27.? − 163 = 229
  28. 28.160 + 327 =
  29. 29.541 − ? = 219
  30. 30.A school has 397 children. 255 of them are girls. How many boys are there?
  31. 31.376 + 464 =
  32. 32.528 − 106 =
  33. 33.619 − 579 =
  34. 34.826 + 111 =
  35. 35.A train has 395 people in the front coaches and 210 people in the back coaches. How many people are on the train?
  36. 36.269 + 539 =
  37. 37.A school has 449 children. 194 of them are girls. How many boys are there?
  38. 38.648 + 215 =
  39. 39.A train has 499 people in the front coaches and 394 people in the back coaches. How many people are on the train?
  40. 40.814 + ? = 966

Answer key

  1. 112
  2. 829
  3. 380
  4. 571
  5. 122
  6. 946
  7. 437
  8. 884
  9. 32
  10. 962
  11. 78
  12. 850
  13. 843
  14. 155
  15. 993
  16. 363
  17. 415
  18. 710
  19. 721
  20. 311
  21. 957
  22. 388
  23. 793
  24. 149
  25. 138
  26. 653
  27. 392
  28. 487
  29. 322
  30. 142
  31. 840
  32. 422
  33. 40
  34. 937
  35. 605
  36. 808
  37. 255
  38. 863
  39. 893
  40. 152

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