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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 273 · 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 401 children. 318 of them are girls. How many boys are there?
  2. 2.A train has 898 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  3. 3.A train has 364 people in the front coaches and 411 people in the back coaches. How many people are on the train?
  4. 4.268 − ? = 56
  5. 5.964 − ? = 83
  6. 6.A train has 624 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  7. 7.752 + ? = 978
  8. 8.598 + ? = 744
  9. 9.293 + 653 =
  10. 10.191 + 566 =
  11. 11.273 − ? = 173
  12. 12.A school has 389 children. 174 of them are girls. How many boys are there?
  13. 13.498 + 323 =
  14. 14.376 + 271 =
  15. 15.640 − 345 =
  16. 16.258 − ? = 77
  17. 17.? − 178 = 191
  18. 18.A school has 332 children. 227 of them are girls. How many boys are there?
  19. 19.516 + 286 =
  20. 20.A school has 809 children. 123 of them are girls. How many boys are there?
  21. 21.416 − 119 =
  22. 22.A train has 436 people in the front coaches and 363 people in the back coaches. How many people are on the train?
  23. 23.123 + 634 =
  24. 24.488 + 318 =
  25. 25.261 + 651 =
  26. 26.A train has 588 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  27. 27.A train has 597 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  28. 28.315 − 150 =
  29. 29.264 + 352 =
  30. 30.534 + ? = 993
  31. 31.238 − ? = 3
  32. 32.322 + 300 =
  33. 33.290 + 315 =
  34. 34.A train has 566 people in the front coaches and 406 people in the back coaches. How many people are on the train?
  35. 35.A train has 132 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  36. 36.A school has 981 children. 718 of them are girls. How many boys are there?
  37. 37.A school has 426 children. 407 of them are girls. How many boys are there?
  38. 38.560 − 136 =
  39. 39.423 + 343 =
  40. 40.326 + 312 =

Answer key

  1. 83
  2. 998
  3. 775
  4. 212
  5. 881
  6. 734
  7. 226
  8. 146
  9. 946
  10. 757
  11. 100
  12. 215
  13. 821
  14. 647
  15. 295
  16. 181
  17. 369
  18. 105
  19. 802
  20. 686
  21. 297
  22. 799
  23. 757
  24. 806
  25. 912
  26. 821
  27. 902
  28. 165
  29. 616
  30. 459
  31. 235
  32. 622
  33. 605
  34. 972
  35. 407
  36. 263
  37. 19
  38. 424
  39. 766
  40. 638

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