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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 744 · 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 train has 549 people in the front coaches and 310 people in the back coaches. How many people are on the train?
  2. 2.690 + 270 =
  3. 3.? + 522 = 969
  4. 4.637 + 150 =
  5. 5.395 + 580 =
  6. 6.A school has 206 children. 127 of them are girls. How many boys are there?
  7. 7.920 − 704 =
  8. 8.470 − 126 =
  9. 9.? − 199 = 7
  10. 10.A train has 608 people in the front coaches and 311 people in the back coaches. How many people are on the train?
  11. 11.608 − 377 =
  12. 12.599 − 187 =
  13. 13.? + 583 = 793
  14. 14.A train has 488 people in the front coaches and 211 people in the back coaches. How many people are on the train?
  15. 15.703 + 169 =
  16. 16.507 − 418 =
  17. 17.305 − 151 =
  18. 18.A train has 281 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  19. 19.? − 397 = 548
  20. 20.A train has 639 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  21. 21.A school has 356 children. 101 of them are girls. How many boys are there?
  22. 22.277 + 333 =
  23. 23.A school has 992 children. 367 of them are girls. How many boys are there?
  24. 24.703 − 119 =
  25. 25.926 − 758 =
  26. 26.516 − 462 =
  27. 27.A school has 386 children. 366 of them are girls. How many boys are there?
  28. 28.214 − 110 =
  29. 29.173 + ? = 333
  30. 30.? − 163 = 605
  31. 31.527 + 357 =
  32. 32.778 + ? = 906
  33. 33.218 + 176 =
  34. 34.? + 790 = 985
  35. 35.454 + ? = 894
  36. 36.A school has 402 children. 349 of them are girls. How many boys are there?
  37. 37.A school has 653 children. 183 of them are girls. How many boys are there?
  38. 38.237 + 500 =
  39. 39.473 − ? = 145
  40. 40.651 − 341 =

Answer key

  1. 859
  2. 960
  3. 447
  4. 787
  5. 975
  6. 79
  7. 216
  8. 344
  9. 206
  10. 919
  11. 231
  12. 412
  13. 210
  14. 699
  15. 872
  16. 89
  17. 154
  18. 470
  19. 945
  20. 751
  21. 255
  22. 610
  23. 625
  24. 584
  25. 168
  26. 54
  27. 20
  28. 104
  29. 160
  30. 768
  31. 884
  32. 128
  33. 394
  34. 195
  35. 440
  36. 53
  37. 470
  38. 737
  39. 328
  40. 310

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