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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 900 · 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 469 children. 160 of them are girls. How many boys are there?
  2. 2.968 − 814 =
  3. 3.A train has 193 people in the front coaches and 796 people in the back coaches. How many people are on the train?
  4. 4.734 − 407 =
  5. 5.A train has 282 people in the front coaches and 477 people in the back coaches. How many people are on the train?
  6. 6.A train has 218 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  7. 7.651 − 109 =
  8. 8.A school has 522 children. 238 of them are girls. How many boys are there?
  9. 9.785 − 316 =
  10. 10.156 + ? = 351
  11. 11.440 − 166 =
  12. 12.337 + 177 =
  13. 13.A school has 439 children. 261 of them are girls. How many boys are there?
  14. 14.? − 137 = 171
  15. 15.A school has 409 children. 300 of them are girls. How many boys are there?
  16. 16.173 + 562 =
  17. 17.? − 471 = 364
  18. 18.409 − 283 =
  19. 19.A train has 417 people in the front coaches and 443 people in the back coaches. How many people are on the train?
  20. 20.765 − 604 =
  21. 21.517 − ? = 353
  22. 22.A school has 821 children. 346 of them are girls. How many boys are there?
  23. 23.516 + 465 =
  24. 24.A school has 439 children. 252 of them are girls. How many boys are there?
  25. 25.A train has 302 people in the front coaches and 525 people in the back coaches. How many people are on the train?
  26. 26.A school has 599 children. 155 of them are girls. How many boys are there?
  27. 27.A school has 506 children. 451 of them are girls. How many boys are there?
  28. 28.A school has 341 children. 307 of them are girls. How many boys are there?
  29. 29.? − 816 = 137
  30. 30.A school has 291 children. 133 of them are girls. How many boys are there?
  31. 31.272 − ? = 22
  32. 32.633 + 296 =
  33. 33.407 − 333 =
  34. 34.A school has 346 children. 310 of them are girls. How many boys are there?
  35. 35.267 − 105 =
  36. 36.A train has 453 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  37. 37.? + 240 = 714
  38. 38.A school has 915 children. 430 of them are girls. How many boys are there?
  39. 39.A school has 983 children. 530 of them are girls. How many boys are there?
  40. 40.306 − 112 =

Answer key

  1. 309
  2. 154
  3. 989
  4. 327
  5. 759
  6. 346
  7. 542
  8. 284
  9. 469
  10. 195
  11. 274
  12. 514
  13. 178
  14. 308
  15. 109
  16. 735
  17. 835
  18. 126
  19. 860
  20. 161
  21. 164
  22. 475
  23. 981
  24. 187
  25. 827
  26. 444
  27. 55
  28. 34
  29. 953
  30. 158
  31. 250
  32. 929
  33. 74
  34. 36
  35. 162
  36. 704
  37. 474
  38. 485
  39. 453
  40. 194

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