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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 345 · 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. 1.710 − 218 =
  2. 2.A train has 292 people in the front coaches and 605 people in the back coaches. How many people are on the train?
  3. 3.A school has 843 children. 768 of them are girls. How many boys are there?
  4. 4.? + 612 = 735
  5. 5.557 + 318 =
  6. 6.252 + 222 =
  7. 7.? − 112 = 449
  8. 8.A school has 749 children. 427 of them are girls. How many boys are there?
  9. 9.A school has 996 children. 496 of them are girls. How many boys are there?
  10. 10.333 + 372 =
  11. 11.264 + 587 =
  12. 12.217 + 662 =
  13. 13.A school has 630 children. 371 of them are girls. How many boys are there?
  14. 14.225 + 533 =
  15. 15.301 + 337 =
  16. 16.A school has 917 children. 146 of them are girls. How many boys are there?
  17. 17.197 + ? = 668
  18. 18.261 + 251 =
  19. 19.A school has 456 children. 442 of them are girls. How many boys are there?
  20. 20.A train has 218 people in the front coaches and 372 people in the back coaches. How many people are on the train?
  21. 21.690 − ? = 15
  22. 22.A train has 828 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  23. 23.217 + 542 =
  24. 24.350 − 150 =
  25. 25.A school has 353 children. 187 of them are girls. How many boys are there?
  26. 26.277 − 146 =
  27. 27.? + 215 = 742
  28. 28.178 + 442 =
  29. 29.745 + ? = 912
  30. 30.A train has 475 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  31. 31.A train has 572 people in the front coaches and 360 people in the back coaches. How many people are on the train?
  32. 32.A train has 299 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  33. 33.A train has 159 people in the front coaches and 556 people in the back coaches. How many people are on the train?
  34. 34.A train has 854 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  35. 35.244 − 187 =
  36. 36.755 + 133 =
  37. 37.A school has 281 children. 249 of them are girls. How many boys are there?
  38. 38.908 − ? = 246
  39. 39.A train has 191 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  40. 40.438 − 397 =

Answer key

  1. 492
  2. 897
  3. 75
  4. 123
  5. 875
  6. 474
  7. 561
  8. 322
  9. 500
  10. 705
  11. 851
  12. 879
  13. 259
  14. 758
  15. 638
  16. 771
  17. 471
  18. 512
  19. 14
  20. 590
  21. 675
  22. 964
  23. 759
  24. 200
  25. 166
  26. 131
  27. 527
  28. 620
  29. 167
  30. 781
  31. 932
  32. 466
  33. 715
  34. 989
  35. 57
  36. 888
  37. 32
  38. 662
  39. 334
  40. 41

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