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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 842 · 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. 1.692 + 266 =
  2. 2.? + 300 = 685
  3. 3.? + 642 = 991
  4. 4.225 − 201 =
  5. 5.374 − 269 =
  6. 6.200 − 148 =
  7. 7.757 + ? = 890
  8. 8.237 − 198 =
  9. 9.A school has 548 children. 177 of them are girls. How many boys are there?
  10. 10.911 − ? = 644
  11. 11.680 − 356 =
  12. 12.741 + 181 =
  13. 13.A train has 689 people in the front coaches and 132 people in the back coaches. How many people are on the train?
  14. 14.796 − 287 =
  15. 15.508 + 254 =
  16. 16.340 + ? = 815
  17. 17.A school has 441 children. 340 of them are girls. How many boys are there?
  18. 18.813 + ? = 927
  19. 19.521 + 283 =
  20. 20.359 − 220 =
  21. 21.233 + ? = 823
  22. 22.999 − 958 =
  23. 23.A train has 849 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  24. 24.A train has 222 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  25. 25.399 + 233 =
  26. 26.730 + 202 =
  27. 27.303 − 270 =
  28. 28.875 + 121 =
  29. 29.609 + 226 =
  30. 30.751 − 733 =
  31. 31.659 + ? = 825
  32. 32.A school has 344 children. 247 of them are girls. How many boys are there?
  33. 33.A train has 684 people in the front coaches and 304 people in the back coaches. How many people are on the train?
  34. 34.391 + 470 =
  35. 35.A train has 346 people in the front coaches and 508 people in the back coaches. How many people are on the train?
  36. 36.520 + ? = 793
  37. 37.246 − 151 =
  38. 38.389 + ? = 922
  39. 39.? + 433 = 815
  40. 40.A train has 431 people in the front coaches and 163 people in the back coaches. How many people are on the train?

Answer key

  1. 958
  2. 385
  3. 349
  4. 24
  5. 105
  6. 52
  7. 133
  8. 39
  9. 371
  10. 267
  11. 324
  12. 922
  13. 821
  14. 509
  15. 762
  16. 475
  17. 101
  18. 114
  19. 804
  20. 139
  21. 590
  22. 41
  23. 985
  24. 592
  25. 632
  26. 932
  27. 33
  28. 996
  29. 835
  30. 18
  31. 166
  32. 97
  33. 988
  34. 861
  35. 854
  36. 273
  37. 95
  38. 533
  39. 382
  40. 594

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