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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 67 · 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.? + 425 = 920
  2. 2.A school has 261 children. 160 of them are girls. How many boys are there?
  3. 3.A school has 843 children. 636 of them are girls. How many boys are there?
  4. 4.730 + ? = 975
  5. 5.? + 502 = 690
  6. 6.A school has 679 children. 316 of them are girls. How many boys are there?
  7. 7.860 + ? = 975
  8. 8.? − 866 = 2
  9. 9.A school has 252 children. 187 of them are girls. How many boys are there?
  10. 10.857 − 239 =
  11. 11.A school has 757 children. 124 of them are girls. How many boys are there?
  12. 12.332 + 289 =
  13. 13.320 + 258 =
  14. 14.517 + 418 =
  15. 15.? + 463 = 941
  16. 16.671 − ? = 41
  17. 17.362 + 100 =
  18. 18.A school has 469 children. 346 of them are girls. How many boys are there?
  19. 19.A school has 837 children. 331 of them are girls. How many boys are there?
  20. 20.398 − 206 =
  21. 21.805 − 214 =
  22. 22.751 + ? = 918
  23. 23.377 − 103 =
  24. 24.? + 812 = 990
  25. 25.A train has 515 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  26. 26.314 − 248 =
  27. 27.A school has 247 children. 217 of them are girls. How many boys are there?
  28. 28.A train has 325 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  29. 29.671 + 297 =
  30. 30.752 − 222 =
  31. 31.395 − 212 =
  32. 32.679 + 202 =
  33. 33.599 + ? = 708
  34. 34.A train has 805 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  35. 35.A school has 889 children. 272 of them are girls. How many boys are there?
  36. 36.? + 167 = 441
  37. 37.276 − 193 =
  38. 38.844 − ? = 200
  39. 39.170 + 716 =
  40. 40.708 + ? = 825

Answer key

  1. 495
  2. 101
  3. 207
  4. 245
  5. 188
  6. 363
  7. 115
  8. 868
  9. 65
  10. 618
  11. 633
  12. 621
  13. 578
  14. 935
  15. 478
  16. 630
  17. 462
  18. 123
  19. 506
  20. 192
  21. 591
  22. 167
  23. 274
  24. 178
  25. 791
  26. 66
  27. 30
  28. 580
  29. 968
  30. 530
  31. 183
  32. 881
  33. 109
  34. 925
  35. 617
  36. 274
  37. 83
  38. 644
  39. 886
  40. 117

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