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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 582 · 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 724 children. 625 of them are girls. How many boys are there?
  2. 2.629 + 311 =
  3. 3.244 − 236 =
  4. 4.? − 190 = 280
  5. 5.232 − ? = 111
  6. 6.A school has 762 children. 286 of them are girls. How many boys are there?
  7. 7.322 + ? = 470
  8. 8.A train has 879 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  9. 9.A school has 662 children. 442 of them are girls. How many boys are there?
  10. 10.455 + ? = 924
  11. 11.222 + ? = 981
  12. 12.? − 599 = 98
  13. 13.389 + 492 =
  14. 14.527 − 451 =
  15. 15.460 + 527 =
  16. 16.172 + ? = 910
  17. 17.A school has 874 children. 762 of them are girls. How many boys are there?
  18. 18.264 − ? = 84
  19. 19.A train has 240 people in the front coaches and 502 people in the back coaches. How many people are on the train?
  20. 20.? − 783 = 75
  21. 21.A train has 754 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  22. 22.533 + ? = 727
  23. 23.769 − 320 =
  24. 24.? + 649 = 936
  25. 25.960 − 280 =
  26. 26.A train has 426 people in the front coaches and 191 people in the back coaches. How many people are on the train?
  27. 27.A school has 624 children. 621 of them are girls. How many boys are there?
  28. 28.A school has 608 children. 536 of them are girls. How many boys are there?
  29. 29.251 − 206 =
  30. 30.995 − 415 =
  31. 31.270 + ? = 477
  32. 32.A school has 575 children. 513 of them are girls. How many boys are there?
  33. 33.A school has 229 children. 125 of them are girls. How many boys are there?
  34. 34.160 + ? = 589
  35. 35.849 + 101 =
  36. 36.576 + 276 =
  37. 37.A school has 938 children. 566 of them are girls. How many boys are there?
  38. 38.230 + 725 =
  39. 39.374 + 216 =
  40. 40.313 + 306 =

Answer key

  1. 99
  2. 940
  3. 8
  4. 470
  5. 121
  6. 476
  7. 148
  8. 979
  9. 220
  10. 469
  11. 759
  12. 697
  13. 881
  14. 76
  15. 987
  16. 738
  17. 112
  18. 180
  19. 742
  20. 858
  21. 970
  22. 194
  23. 449
  24. 287
  25. 680
  26. 617
  27. 3
  28. 72
  29. 45
  30. 580
  31. 207
  32. 62
  33. 104
  34. 429
  35. 950
  36. 852
  37. 372
  38. 955
  39. 590
  40. 619

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