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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 684 · 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. 1.297 + 285 =
  2. 2.A train has 830 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  3. 3.A train has 816 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  4. 4.636 − 130 =
  5. 5.894 + 102 =
  6. 6.746 − ? = 412
  7. 7.410 − 409 =
  8. 8.A school has 664 children. 656 of them are girls. How many boys are there?
  9. 9.699 + 168 =
  10. 10.250 + 322 =
  11. 11.751 + 103 =
  12. 12.A train has 229 people in the front coaches and 514 people in the back coaches. How many people are on the train?
  13. 13.A train has 750 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  14. 14.878 − 450 =
  15. 15.577 − 462 =
  16. 16.965 − ? = 100
  17. 17.380 + 113 =
  18. 18.698 + ? = 965
  19. 19.796 − 389 =
  20. 20.A school has 380 children. 198 of them are girls. How many boys are there?
  21. 21.626 + 177 =
  22. 22.644 − ? = 19
  23. 23.550 − 192 =
  24. 24.707 − ? = 565
  25. 25.454 − 213 =
  26. 26.A school has 315 children. 107 of them are girls. How many boys are there?
  27. 27.A school has 555 children. 489 of them are girls. How many boys are there?
  28. 28.280 − ? = 123
  29. 29.894 + 100 =
  30. 30.A school has 280 children. 145 of them are girls. How many boys are there?
  31. 31.245 + ? = 782
  32. 32.409 − ? = 84
  33. 33.502 + 227 =
  34. 34.668 + 132 =
  35. 35.A school has 348 children. 169 of them are girls. How many boys are there?
  36. 36.A school has 299 children. 170 of them are girls. How many boys are there?
  37. 37.992 − 488 =
  38. 38.A school has 900 children. 655 of them are girls. How many boys are there?
  39. 39.784 + 124 =
  40. 40.301 − 122 =

Answer key

  1. 582
  2. 937
  3. 993
  4. 506
  5. 996
  6. 334
  7. 1
  8. 8
  9. 867
  10. 572
  11. 854
  12. 743
  13. 972
  14. 428
  15. 115
  16. 865
  17. 493
  18. 267
  19. 407
  20. 182
  21. 803
  22. 625
  23. 358
  24. 142
  25. 241
  26. 208
  27. 66
  28. 157
  29. 994
  30. 135
  31. 537
  32. 325
  33. 729
  34. 800
  35. 179
  36. 129
  37. 504
  38. 245
  39. 908
  40. 179

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