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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 928 · 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 225 children. 116 of them are girls. How many boys are there?
  2. 2.818 − ? = 523
  3. 3.555 − ? = 156
  4. 4.A school has 526 children. 347 of them are girls. How many boys are there?
  5. 5.126 + 491 =
  6. 6.A train has 512 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  7. 7.946 − 773 =
  8. 8.684 + 235 =
  9. 9.? − 325 = 341
  10. 10.499 − 242 =
  11. 11.A train has 387 people in the front coaches and 210 people in the back coaches. How many people are on the train?
  12. 12.? + 262 = 682
  13. 13.? − 423 = 14
  14. 14.464 − 159 =
  15. 15.377 − ? = 134
  16. 16.646 − 535 =
  17. 17.? − 407 = 27
  18. 18.598 − 360 =
  19. 19.694 + ? = 865
  20. 20.A train has 824 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  21. 21.270 + 514 =
  22. 22.A school has 995 children. 247 of them are girls. How many boys are there?
  23. 23.241 + 103 =
  24. 24.A school has 272 children. 112 of them are girls. How many boys are there?
  25. 25.205 − 103 =
  26. 26.177 + 784 =
  27. 27.? − 484 = 168
  28. 28.323 − ? = 166
  29. 29.240 − 140 =
  30. 30.930 − 269 =
  31. 31.924 − ? = 774
  32. 32.366 + 289 =
  33. 33.? − 528 = 5
  34. 34.482 − 319 =
  35. 35.804 − ? = 656
  36. 36.267 + 146 =
  37. 37.A train has 337 people in the front coaches and 522 people in the back coaches. How many people are on the train?
  38. 38.? + 226 = 864
  39. 39.A school has 644 children. 185 of them are girls. How many boys are there?
  40. 40.A school has 470 children. 397 of them are girls. How many boys are there?

Answer key

  1. 109
  2. 295
  3. 399
  4. 179
  5. 617
  6. 701
  7. 173
  8. 919
  9. 666
  10. 257
  11. 597
  12. 420
  13. 437
  14. 305
  15. 243
  16. 111
  17. 434
  18. 238
  19. 171
  20. 950
  21. 784
  22. 748
  23. 344
  24. 160
  25. 102
  26. 961
  27. 652
  28. 157
  29. 100
  30. 661
  31. 150
  32. 655
  33. 533
  34. 163
  35. 148
  36. 413
  37. 859
  38. 638
  39. 459
  40. 73

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