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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 884 · 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. 1.692 + 118 =
  2. 2.? − 155 = 83
  3. 3.? − 283 = 125
  4. 4.195 + 693 =
  5. 5.A school has 313 children. 206 of them are girls. How many boys are there?
  6. 6.979 − 346 =
  7. 7.959 − ? = 281
  8. 8.A school has 507 children. 361 of them are girls. How many boys are there?
  9. 9.308 − ? = 174
  10. 10.559 − ? = 232
  11. 11.478 + ? = 692
  12. 12.A train has 804 people in the front coaches and 174 people in the back coaches. How many people are on the train?
  13. 13.613 + ? = 765
  14. 14.270 + ? = 465
  15. 15.A school has 973 children. 850 of them are girls. How many boys are there?
  16. 16.480 − ? = 273
  17. 17.867 + 126 =
  18. 18.A school has 697 children. 381 of them are girls. How many boys are there?
  19. 19.776 − 672 =
  20. 20.287 + 675 =
  21. 21.? − 211 = 492
  22. 22.A school has 503 children. 308 of them are girls. How many boys are there?
  23. 23.295 + 607 =
  24. 24.A school has 778 children. 226 of them are girls. How many boys are there?
  25. 25.A train has 331 people in the front coaches and 662 people in the back coaches. How many people are on the train?
  26. 26.A train has 813 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  27. 27.909 − ? = 351
  28. 28.967 − ? = 671
  29. 29.260 − 247 =
  30. 30.974 − ? = 493
  31. 31.? − 350 = 63
  32. 32.? − 331 = 608
  33. 33.845 − ? = 650
  34. 34.356 − ? = 50
  35. 35.? + 197 = 424
  36. 36.609 + 130 =
  37. 37.831 − 789 =
  38. 38.759 − ? = 612
  39. 39.A train has 814 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  40. 40.336 + 451 =

Answer key

  1. 810
  2. 238
  3. 408
  4. 888
  5. 107
  6. 633
  7. 678
  8. 146
  9. 134
  10. 327
  11. 214
  12. 978
  13. 152
  14. 195
  15. 123
  16. 207
  17. 993
  18. 316
  19. 104
  20. 962
  21. 703
  22. 195
  23. 902
  24. 552
  25. 993
  26. 974
  27. 558
  28. 296
  29. 13
  30. 481
  31. 413
  32. 939
  33. 195
  34. 306
  35. 227
  36. 739
  37. 42
  38. 147
  39. 926
  40. 787

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