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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 451 · 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 681 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  2. 2.? − 322 = 27
  3. 3.478 − 457 =
  4. 4.A school has 926 children. 159 of them are girls. How many boys are there?
  5. 5.652 − 344 =
  6. 6.735 + ? = 901
  7. 7.314 + 225 =
  8. 8.297 − 132 =
  9. 9.? + 228 = 646
  10. 10.219 − ? = 51
  11. 11.883 − ? = 595
  12. 12.? + 106 = 721
  13. 13.A train has 558 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  14. 14.? − 327 = 614
  15. 15.623 + ? = 839
  16. 16.325 + 288 =
  17. 17.? − 219 = 388
  18. 18.A train has 108 people in the front coaches and 583 people in the back coaches. How many people are on the train?
  19. 19.371 + ? = 543
  20. 20.696 + 263 =
  21. 21.146 + 100 =
  22. 22.? + 860 = 972
  23. 23.A school has 851 children. 240 of them are girls. How many boys are there?
  24. 24.A train has 520 people in the front coaches and 237 people in the back coaches. How many people are on the train?
  25. 25.A train has 130 people in the front coaches and 698 people in the back coaches. How many people are on the train?
  26. 26.A train has 468 people in the front coaches and 163 people in the back coaches. How many people are on the train?
  27. 27.374 − 327 =
  28. 28.? + 345 = 965
  29. 29.A school has 304 children. 185 of them are girls. How many boys are there?
  30. 30.268 − ? = 158
  31. 31.208 − 120 =
  32. 32.628 − ? = 279
  33. 33.451 + 466 =
  34. 34.? − 122 = 440
  35. 35.A school has 494 children. 144 of them are girls. How many boys are there?
  36. 36.438 − 261 =
  37. 37.379 − 226 =
  38. 38.A train has 635 people in the front coaches and 301 people in the back coaches. How many people are on the train?
  39. 39.755 − 189 =
  40. 40.A school has 607 children. 198 of them are girls. How many boys are there?

Answer key

  1. 823
  2. 349
  3. 21
  4. 767
  5. 308
  6. 166
  7. 539
  8. 165
  9. 418
  10. 168
  11. 288
  12. 615
  13. 958
  14. 941
  15. 216
  16. 613
  17. 607
  18. 691
  19. 172
  20. 959
  21. 246
  22. 112
  23. 611
  24. 757
  25. 828
  26. 631
  27. 47
  28. 620
  29. 119
  30. 110
  31. 88
  32. 349
  33. 917
  34. 562
  35. 350
  36. 177
  37. 153
  38. 936
  39. 566
  40. 409

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