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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 234 · 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. 1.831 − ? = 242
  2. 2.125 + 680 =
  3. 3.890 + 100 =
  4. 4.? − 386 = 6
  5. 5.A school has 565 children. 368 of them are girls. How many boys are there?
  6. 6.853 − 707 =
  7. 7.A train has 493 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  8. 8.760 − 740 =
  9. 9.758 + ? = 891
  10. 10.A train has 789 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  11. 11.684 − ? = 423
  12. 12.529 + ? = 767
  13. 13.661 − 538 =
  14. 14.A school has 274 children. 176 of them are girls. How many boys are there?
  15. 15.A train has 286 people in the front coaches and 387 people in the back coaches. How many people are on the train?
  16. 16.A school has 529 children. 325 of them are girls. How many boys are there?
  17. 17.679 − 346 =
  18. 18.501 − ? = 30
  19. 19.620 + ? = 798
  20. 20.A school has 251 children. 115 of them are girls. How many boys are there?
  21. 21.975 − ? = 65
  22. 22.403 + 215 =
  23. 23.479 + 423 =
  24. 24.A train has 426 people in the front coaches and 168 people in the back coaches. How many people are on the train?
  25. 25.A school has 424 children. 289 of them are girls. How many boys are there?
  26. 26.? − 197 = 60
  27. 27.330 + ? = 434
  28. 28.A school has 261 children. 124 of them are girls. How many boys are there?
  29. 29.A school has 910 children. 703 of them are girls. How many boys are there?
  30. 30.? + 829 = 988
  31. 31.490 + 449 =
  32. 32.619 + 121 =
  33. 33.443 + 276 =
  34. 34.A school has 248 children. 215 of them are girls. How many boys are there?
  35. 35.? + 406 = 633
  36. 36.440 + 340 =
  37. 37.837 − 706 =
  38. 38.260 − 112 =
  39. 39.A school has 334 children. 124 of them are girls. How many boys are there?
  40. 40.A school has 794 children. 114 of them are girls. How many boys are there?

Answer key

  1. 589
  2. 805
  3. 990
  4. 392
  5. 197
  6. 146
  7. 893
  8. 20
  9. 133
  10. 924
  11. 261
  12. 238
  13. 123
  14. 98
  15. 673
  16. 204
  17. 333
  18. 471
  19. 178
  20. 136
  21. 910
  22. 618
  23. 902
  24. 594
  25. 135
  26. 257
  27. 104
  28. 137
  29. 207
  30. 159
  31. 939
  32. 740
  33. 719
  34. 33
  35. 227
  36. 780
  37. 131
  38. 148
  39. 210
  40. 680

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