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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 992 · 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. 1.184 + 605 =
  2. 2.731 − 672 =
  3. 3.? − 754 = 7
  4. 4.640 − ? = 473
  5. 5.659 − 187 =
  6. 6.A school has 266 children. 103 of them are girls. How many boys are there?
  7. 7.217 + ? = 358
  8. 8.A school has 272 children. 132 of them are girls. How many boys are there?
  9. 9.955 − 855 =
  10. 10.A school has 372 children. 324 of them are girls. How many boys are there?
  11. 11.? + 422 = 676
  12. 12.? − 187 = 449
  13. 13.808 + 167 =
  14. 14.916 − ? = 614
  15. 15.502 + 305 =
  16. 16.553 + 311 =
  17. 17.? + 250 = 845
  18. 18.A school has 706 children. 435 of them are girls. How many boys are there?
  19. 19.601 − ? = 319
  20. 20.A train has 425 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  21. 21.465 − ? = 220
  22. 22.788 + 129 =
  23. 23.314 + 370 =
  24. 24.854 − 724 =
  25. 25.A school has 553 children. 373 of them are girls. How many boys are there?
  26. 26.995 − 409 =
  27. 27.793 − ? = 320
  28. 28.A train has 628 people in the front coaches and 242 people in the back coaches. How many people are on the train?
  29. 29.315 − ? = 184
  30. 30.A school has 709 children. 365 of them are girls. How many boys are there?
  31. 31.580 + ? = 945
  32. 32.A school has 203 children. 200 of them are girls. How many boys are there?
  33. 33.A train has 310 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  34. 34.784 − 441 =
  35. 35.? + 569 = 775
  36. 36.367 − ? = 262
  37. 37.698 − 432 =
  38. 38.A train has 110 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  39. 39.? − 103 = 236
  40. 40.240 + 260 =

Answer key

  1. 789
  2. 59
  3. 761
  4. 167
  5. 472
  6. 163
  7. 141
  8. 140
  9. 100
  10. 48
  11. 254
  12. 636
  13. 975
  14. 302
  15. 807
  16. 864
  17. 595
  18. 271
  19. 282
  20. 704
  21. 245
  22. 917
  23. 684
  24. 130
  25. 180
  26. 586
  27. 473
  28. 870
  29. 131
  30. 344
  31. 365
  32. 3
  33. 443
  34. 343
  35. 206
  36. 105
  37. 266
  38. 286
  39. 339
  40. 500

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