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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 922 · 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 train has 550 people in the front coaches and 430 people in the back coaches. How many people are on the train?
  2. 2.703 + 107 =
  3. 3.539 + 405 =
  4. 4.A school has 634 children. 404 of them are girls. How many boys are there?
  5. 5.? + 244 = 839
  6. 6.310 + ? = 492
  7. 7.345 + 487 =
  8. 8.215 − 210 =
  9. 9.789 + 133 =
  10. 10.A school has 440 children. 350 of them are girls. How many boys are there?
  11. 11.A school has 585 children. 176 of them are girls. How many boys are there?
  12. 12.586 + 313 =
  13. 13.101 + ? = 423
  14. 14.472 + ? = 773
  15. 15.820 − 193 =
  16. 16.? + 833 = 948
  17. 17.A school has 806 children. 204 of them are girls. How many boys are there?
  18. 18.667 + 264 =
  19. 19.599 − 158 =
  20. 20.778 − ? = 500
  21. 21.659 − 652 =
  22. 22.? + 218 = 689
  23. 23.351 − ? = 205
  24. 24.A school has 937 children. 398 of them are girls. How many boys are there?
  25. 25.996 − ? = 761
  26. 26.A train has 750 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  27. 27.350 − 196 =
  28. 28.605 + ? = 791
  29. 29.? + 173 = 559
  30. 30.267 − 161 =
  31. 31.A train has 231 people in the front coaches and 650 people in the back coaches. How many people are on the train?
  32. 32.A school has 628 children. 278 of them are girls. How many boys are there?
  33. 33.602 − 520 =
  34. 34.A train has 101 people in the front coaches and 537 people in the back coaches. How many people are on the train?
  35. 35.? + 736 = 844
  36. 36.A school has 911 children. 647 of them are girls. How many boys are there?
  37. 37.290 − 142 =
  38. 38.A school has 280 children. 151 of them are girls. How many boys are there?
  39. 39.? + 215 = 440
  40. 40.A train has 699 people in the front coaches and 114 people in the back coaches. How many people are on the train?

Answer key

  1. 980
  2. 810
  3. 944
  4. 230
  5. 595
  6. 182
  7. 832
  8. 5
  9. 922
  10. 90
  11. 409
  12. 899
  13. 322
  14. 301
  15. 627
  16. 115
  17. 602
  18. 931
  19. 441
  20. 278
  21. 7
  22. 471
  23. 146
  24. 539
  25. 235
  26. 952
  27. 154
  28. 186
  29. 386
  30. 106
  31. 881
  32. 350
  33. 82
  34. 638
  35. 108
  36. 264
  37. 148
  38. 129
  39. 225
  40. 813

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