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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 25 · 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. 1.404 − 142 =
  2. 2.? − 564 = 293
  3. 3.A school has 600 children. 358 of them are girls. How many boys are there?
  4. 4.A school has 828 children. 620 of them are girls. How many boys are there?
  5. 5.314 + 351 =
  6. 6.400 − 314 =
  7. 7.A train has 311 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  8. 8.876 + 109 =
  9. 9.247 + ? = 906
  10. 10.870 + 105 =
  11. 11.318 − 144 =
  12. 12.484 − 310 =
  13. 13.? − 667 = 167
  14. 14.A train has 466 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  15. 15.233 − 103 =
  16. 16.? + 718 = 938
  17. 17.A school has 448 children. 172 of them are girls. How many boys are there?
  18. 18.A train has 526 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  19. 19.930 − 503 =
  20. 20.? − 310 = 104
  21. 21.517 − 508 =
  22. 22.722 − 386 =
  23. 23.113 + ? = 830
  24. 24.? + 493 = 893
  25. 25.A school has 778 children. 474 of them are girls. How many boys are there?
  26. 26.? + 733 = 987
  27. 27.969 − 382 =
  28. 28.A school has 271 children. 222 of them are girls. How many boys are there?
  29. 29.A school has 325 children. 314 of them are girls. How many boys are there?
  30. 30.340 − 182 =
  31. 31.? + 716 = 994
  32. 32.A train has 223 people in the front coaches and 416 people in the back coaches. How many people are on the train?
  33. 33.806 + 170 =
  34. 34.? + 320 = 920
  35. 35.661 − ? = 79
  36. 36.533 − 303 =
  37. 37.284 − ? = 178
  38. 38.901 − 698 =
  39. 39.? + 475 = 935
  40. 40.A train has 408 people in the front coaches and 181 people in the back coaches. How many people are on the train?

Answer key

  1. 262
  2. 857
  3. 242
  4. 208
  5. 665
  6. 86
  7. 708
  8. 985
  9. 659
  10. 975
  11. 174
  12. 174
  13. 834
  14. 634
  15. 130
  16. 220
  17. 276
  18. 708
  19. 427
  20. 414
  21. 9
  22. 336
  23. 717
  24. 400
  25. 304
  26. 254
  27. 587
  28. 49
  29. 11
  30. 158
  31. 278
  32. 639
  33. 976
  34. 600
  35. 582
  36. 230
  37. 106
  38. 203
  39. 460
  40. 589

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