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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 172 · 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. 1.552 + 178 =
  2. 2.? + 630 = 788
  3. 3.A train has 856 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  4. 4.? + 268 = 897
  5. 5.874 + ? = 974
  6. 6.A school has 897 children. 297 of them are girls. How many boys are there?
  7. 7.A school has 245 children. 219 of them are girls. How many boys are there?
  8. 8.504 + ? = 757
  9. 9.259 − 114 =
  10. 10.? + 305 = 606
  11. 11.A school has 901 children. 869 of them are girls. How many boys are there?
  12. 12.629 − 298 =
  13. 13.424 − 262 =
  14. 14.218 − ? = 55
  15. 15.443 + 154 =
  16. 16.312 − 228 =
  17. 17.625 + 207 =
  18. 18.980 − 746 =
  19. 19.828 + ? = 946
  20. 20.A school has 990 children. 315 of them are girls. How many boys are there?
  21. 21.A school has 869 children. 812 of them are girls. How many boys are there?
  22. 22.290 + 434 =
  23. 23.417 + 120 =
  24. 24.? − 213 = 187
  25. 25.273 + ? = 394
  26. 26.? + 507 = 619
  27. 27.A train has 612 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  28. 28.A school has 355 children. 232 of them are girls. How many boys are there?
  29. 29.A train has 849 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  30. 30.115 + ? = 642
  31. 31.A school has 485 children. 427 of them are girls. How many boys are there?
  32. 32.866 − 470 =
  33. 33.757 − 181 =
  34. 34.294 − ? = 181
  35. 35.A school has 436 children. 355 of them are girls. How many boys are there?
  36. 36.? + 869 = 973
  37. 37.? + 480 = 653
  38. 38.A train has 699 people in the front coaches and 225 people in the back coaches. How many people are on the train?
  39. 39.822 + ? = 937
  40. 40.A school has 552 children. 494 of them are girls. How many boys are there?

Answer key

  1. 730
  2. 158
  3. 994
  4. 629
  5. 100
  6. 600
  7. 26
  8. 253
  9. 145
  10. 301
  11. 32
  12. 331
  13. 162
  14. 163
  15. 597
  16. 84
  17. 832
  18. 234
  19. 118
  20. 675
  21. 57
  22. 724
  23. 537
  24. 400
  25. 121
  26. 112
  27. 917
  28. 123
  29. 954
  30. 527
  31. 58
  32. 396
  33. 576
  34. 113
  35. 81
  36. 104
  37. 173
  38. 924
  39. 115
  40. 58

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