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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 314 · 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.? + 618 = 856
  2. 2.535 + ? = 842
  3. 3.A train has 223 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  4. 4.951 − 885 =
  5. 5.? + 140 = 297
  6. 6.205 − ? = 82
  7. 7.357 − 240 =
  8. 8.A train has 521 people in the front coaches and 343 people in the back coaches. How many people are on the train?
  9. 9.A train has 489 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  10. 10.870 + ? = 976
  11. 11.836 − ? = 636
  12. 12.A train has 376 people in the front coaches and 323 people in the back coaches. How many people are on the train?
  13. 13.428 + 518 =
  14. 14.743 + 237 =
  15. 15.296 − 294 =
  16. 16.? − 512 = 250
  17. 17.862 − ? = 642
  18. 18.742 + ? = 917
  19. 19.? + 643 = 913
  20. 20.110 + 770 =
  21. 21.526 − ? = 72
  22. 22.A school has 791 children. 290 of them are girls. How many boys are there?
  23. 23.A school has 334 children. 146 of them are girls. How many boys are there?
  24. 24.287 + ? = 599
  25. 25.470 + ? = 867
  26. 26.? − 123 = 137
  27. 27.A school has 345 children. 325 of them are girls. How many boys are there?
  28. 28.A school has 603 children. 313 of them are girls. How many boys are there?
  29. 29.414 − 389 =
  30. 30.344 − 296 =
  31. 31.? − 313 = 68
  32. 32.A school has 316 children. 123 of them are girls. How many boys are there?
  33. 33.310 + 338 =
  34. 34.A school has 545 children. 439 of them are girls. How many boys are there?
  35. 35.516 + ? = 963
  36. 36.? + 642 = 982
  37. 37.983 − ? = 634
  38. 38.273 + 129 =
  39. 39.A train has 231 people in the front coaches and 472 people in the back coaches. How many people are on the train?
  40. 40.? − 216 = 354

Answer key

  1. 238
  2. 307
  3. 642
  4. 66
  5. 157
  6. 123
  7. 117
  8. 864
  9. 703
  10. 106
  11. 200
  12. 699
  13. 946
  14. 980
  15. 2
  16. 762
  17. 220
  18. 175
  19. 270
  20. 880
  21. 454
  22. 501
  23. 188
  24. 312
  25. 397
  26. 260
  27. 20
  28. 290
  29. 25
  30. 48
  31. 381
  32. 193
  33. 648
  34. 106
  35. 447
  36. 340
  37. 349
  38. 402
  39. 703
  40. 570

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