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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 678 · 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 338 people in the front coaches and 434 people in the back coaches. How many people are on the train?
  2. 2.? + 656 = 782
  3. 3.? − 132 = 771
  4. 4.210 − ? = 85
  5. 5.268 − 164 =
  6. 6.945 − ? = 695
  7. 7.A train has 197 people in the front coaches and 333 people in the back coaches. How many people are on the train?
  8. 8.481 + 133 =
  9. 9.368 − 179 =
  10. 10.793 − 582 =
  11. 11.A school has 862 children. 714 of them are girls. How many boys are there?
  12. 12.? − 112 = 125
  13. 13.382 − ? = 245
  14. 14.? − 449 = 46
  15. 15.A train has 440 people in the front coaches and 506 people in the back coaches. How many people are on the train?
  16. 16.A school has 479 children. 370 of them are girls. How many boys are there?
  17. 17.741 + ? = 921
  18. 18.843 + 137 =
  19. 19.A train has 675 people in the front coaches and 221 people in the back coaches. How many people are on the train?
  20. 20.623 − 591 =
  21. 21.A school has 973 children. 468 of them are girls. How many boys are there?
  22. 22.596 + ? = 757
  23. 23.A school has 508 children. 462 of them are girls. How many boys are there?
  24. 24.737 + 167 =
  25. 25.A train has 633 people in the front coaches and 197 people in the back coaches. How many people are on the train?
  26. 26.236 − ? = 107
  27. 27.596 − 417 =
  28. 28.894 − 742 =
  29. 29.618 + ? = 927
  30. 30.A school has 652 children. 644 of them are girls. How many boys are there?
  31. 31.750 − 200 =
  32. 32.751 + 133 =
  33. 33.486 + 235 =
  34. 34.? − 143 = 157
  35. 35.A school has 800 children. 614 of them are girls. How many boys are there?
  36. 36.A school has 557 children. 274 of them are girls. How many boys are there?
  37. 37.398 + 132 =
  38. 38.484 + ? = 667
  39. 39.? + 407 = 655
  40. 40.A train has 644 people in the front coaches and 241 people in the back coaches. How many people are on the train?

Answer key

  1. 772
  2. 126
  3. 903
  4. 125
  5. 104
  6. 250
  7. 530
  8. 614
  9. 189
  10. 211
  11. 148
  12. 237
  13. 137
  14. 495
  15. 946
  16. 109
  17. 180
  18. 980
  19. 896
  20. 32
  21. 505
  22. 161
  23. 46
  24. 904
  25. 830
  26. 129
  27. 179
  28. 152
  29. 309
  30. 8
  31. 550
  32. 884
  33. 721
  34. 300
  35. 186
  36. 283
  37. 530
  38. 183
  39. 248
  40. 885

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