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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 129 · 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 763 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  2. 2.A school has 331 children. 279 of them are girls. How many boys are there?
  3. 3.720 − 339 =
  4. 4.389 + 480 =
  5. 5.A school has 319 children. 302 of them are girls. How many boys are there?
  6. 6.451 − 110 =
  7. 7.788 + ? = 995
  8. 8.473 − 120 =
  9. 9.A train has 541 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  10. 10.? + 297 = 480
  11. 11.A school has 215 children. 142 of them are girls. How many boys are there?
  12. 12.? − 911 = 20
  13. 13.170 + 195 =
  14. 14.319 + 622 =
  15. 15.A train has 319 people in the front coaches and 528 people in the back coaches. How many people are on the train?
  16. 16.185 + 294 =
  17. 17.440 + 558 =
  18. 18.227 − 148 =
  19. 19.366 + ? = 563
  20. 20.? + 357 = 575
  21. 21.A train has 121 people in the front coaches and 670 people in the back coaches. How many people are on the train?
  22. 22.A school has 723 children. 695 of them are girls. How many boys are there?
  23. 23.A school has 336 children. 167 of them are girls. How many boys are there?
  24. 24.630 − 298 =
  25. 25.162 + 596 =
  26. 26.A school has 343 children. 219 of them are girls. How many boys are there?
  27. 27.338 − 187 =
  28. 28.A train has 728 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  29. 29.546 + 120 =
  30. 30.444 − 261 =
  31. 31.A train has 460 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  32. 32.366 − 133 =
  33. 33.A train has 525 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  34. 34.A school has 551 children. 485 of them are girls. How many boys are there?
  35. 35.643 − 477 =
  36. 36.A school has 555 children. 138 of them are girls. How many boys are there?
  37. 37.344 − 278 =
  38. 38.A school has 823 children. 510 of them are girls. How many boys are there?
  39. 39.? + 123 = 492
  40. 40.745 − 325 =

Answer key

  1. 907
  2. 52
  3. 381
  4. 869
  5. 17
  6. 341
  7. 207
  8. 353
  9. 812
  10. 183
  11. 73
  12. 931
  13. 365
  14. 941
  15. 847
  16. 479
  17. 998
  18. 79
  19. 197
  20. 218
  21. 791
  22. 28
  23. 169
  24. 332
  25. 758
  26. 124
  27. 151
  28. 864
  29. 666
  30. 183
  31. 631
  32. 233
  33. 665
  34. 66
  35. 166
  36. 417
  37. 66
  38. 313
  39. 369
  40. 420

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