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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 885 · 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.A school has 471 children. 461 of them are girls. How many boys are there?
  2. 2.? + 595 = 737
  3. 3.395 − 307 =
  4. 4.A school has 329 children. 103 of them are girls. How many boys are there?
  5. 5.? + 279 = 401
  6. 6.? − 320 = 10
  7. 7.? − 272 = 460
  8. 8.465 + 215 =
  9. 9.A school has 305 children. 141 of them are girls. How many boys are there?
  10. 10.? − 109 = 263
  11. 11.577 + ? = 836
  12. 12.A school has 906 children. 296 of them are girls. How many boys are there?
  13. 13.? − 306 = 204
  14. 14.? − 286 = 545
  15. 15.A train has 725 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  16. 16.444 − 218 =
  17. 17.? + 380 = 923
  18. 18.263 − ? = 151
  19. 19.A school has 969 children. 878 of them are girls. How many boys are there?
  20. 20.? − 393 = 344
  21. 21.123 + ? = 896
  22. 22.184 + ? = 344
  23. 23.A train has 476 people in the front coaches and 402 people in the back coaches. How many people are on the train?
  24. 24.A school has 564 children. 303 of them are girls. How many boys are there?
  25. 25.568 + 254 =
  26. 26.A train has 741 people in the front coaches and 170 people in the back coaches. How many people are on the train?
  27. 27.712 − 202 =
  28. 28.? − 255 = 31
  29. 29.737 − ? = 557
  30. 30.A train has 562 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  31. 31.415 − 365 =
  32. 32.A school has 374 children. 211 of them are girls. How many boys are there?
  33. 33.? + 739 = 979
  34. 34.439 + 361 =
  35. 35.719 + 145 =
  36. 36.556 − ? = 344
  37. 37.A school has 765 children. 381 of them are girls. How many boys are there?
  38. 38.727 + 174 =
  39. 39.756 − 546 =
  40. 40.? − 493 = 137

Answer key

  1. 10
  2. 142
  3. 88
  4. 226
  5. 122
  6. 330
  7. 732
  8. 680
  9. 164
  10. 372
  11. 259
  12. 610
  13. 510
  14. 831
  15. 895
  16. 226
  17. 543
  18. 112
  19. 91
  20. 737
  21. 773
  22. 160
  23. 878
  24. 261
  25. 822
  26. 911
  27. 510
  28. 286
  29. 180
  30. 915
  31. 50
  32. 163
  33. 240
  34. 800
  35. 864
  36. 212
  37. 384
  38. 901
  39. 210
  40. 630

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