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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 658 · 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. 1.368 + ? = 913
  2. 2.282 + 283 =
  3. 3.253 + 175 =
  4. 4.? − 204 = 72
  5. 5.A train has 274 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  6. 6.616 + ? = 947
  7. 7.A school has 866 children. 201 of them are girls. How many boys are there?
  8. 8.A school has 951 children. 447 of them are girls. How many boys are there?
  9. 9.A train has 780 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  10. 10.335 + 520 =
  11. 11.A school has 209 children. 157 of them are girls. How many boys are there?
  12. 12.346 − 131 =
  13. 13.A train has 428 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  14. 14.A train has 356 people in the front coaches and 455 people in the back coaches. How many people are on the train?
  15. 15.? − 176 = 34
  16. 16.473 + 182 =
  17. 17.A school has 833 children. 130 of them are girls. How many boys are there?
  18. 18.869 + 106 =
  19. 19.477 − 298 =
  20. 20.825 − 243 =
  21. 21.242 + 571 =
  22. 22.? − 312 = 55
  23. 23.684 + 264 =
  24. 24.973 − 427 =
  25. 25.928 − 828 =
  26. 26.A school has 557 children. 263 of them are girls. How many boys are there?
  27. 27.280 + 240 =
  28. 28.229 + 139 =
  29. 29.A train has 280 people in the front coaches and 659 people in the back coaches. How many people are on the train?
  30. 30.816 − 705 =
  31. 31.606 + ? = 738
  32. 32.A school has 272 children. 138 of them are girls. How many boys are there?
  33. 33.653 + 326 =
  34. 34.284 + ? = 639
  35. 35.470 − 245 =
  36. 36.266 + ? = 454
  37. 37.A train has 702 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  38. 38.A train has 439 people in the front coaches and 553 people in the back coaches. How many people are on the train?
  39. 39.650 + 206 =
  40. 40.A school has 716 children. 101 of them are girls. How many boys are there?

Answer key

  1. 545
  2. 565
  3. 428
  4. 276
  5. 375
  6. 331
  7. 665
  8. 504
  9. 917
  10. 855
  11. 52
  12. 215
  13. 756
  14. 811
  15. 210
  16. 655
  17. 703
  18. 975
  19. 179
  20. 582
  21. 813
  22. 367
  23. 948
  24. 546
  25. 100
  26. 294
  27. 520
  28. 368
  29. 939
  30. 111
  31. 132
  32. 134
  33. 979
  34. 355
  35. 225
  36. 188
  37. 996
  38. 992
  39. 856
  40. 615

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