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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 147 · 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 school has 526 children. 290 of them are girls. How many boys are there?
  2. 2.A school has 707 children. 503 of them are girls. How many boys are there?
  3. 3.? + 668 = 996
  4. 4.A train has 415 people in the front coaches and 261 people in the back coaches. How many people are on the train?
  5. 5.? + 401 = 622
  6. 6.463 − ? = 192
  7. 7.653 + 195 =
  8. 8.101 + ? = 892
  9. 9.445 − 404 =
  10. 10.360 + 470 =
  11. 11.378 + ? = 597
  12. 12.? + 871 = 971
  13. 13.667 + 298 =
  14. 14.A school has 858 children. 798 of them are girls. How many boys are there?
  15. 15.A train has 350 people in the front coaches and 564 people in the back coaches. How many people are on the train?
  16. 16.122 + 177 =
  17. 17.320 − 153 =
  18. 18.307 − ? = 124
  19. 19.A train has 499 people in the front coaches and 442 people in the back coaches. How many people are on the train?
  20. 20.A train has 544 people in the front coaches and 443 people in the back coaches. How many people are on the train?
  21. 21.824 − ? = 624
  22. 22.343 − 195 =
  23. 23.? + 844 = 981
  24. 24.432 + 256 =
  25. 25.? + 120 = 635
  26. 26.186 + 219 =
  27. 27.652 − ? = 486
  28. 28.778 − 759 =
  29. 29.674 − ? = 452
  30. 30.302 − 216 =
  31. 31.A school has 921 children. 336 of them are girls. How many boys are there?
  32. 32.816 + 105 =
  33. 33.A train has 208 people in the front coaches and 642 people in the back coaches. How many people are on the train?
  34. 34.A school has 304 children. 144 of them are girls. How many boys are there?
  35. 35.973 − ? = 103
  36. 36.805 + ? = 999
  37. 37.? − 573 = 128
  38. 38.A train has 659 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  39. 39.A train has 629 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  40. 40.386 − 349 =

Answer key

  1. 236
  2. 204
  3. 328
  4. 676
  5. 221
  6. 271
  7. 848
  8. 791
  9. 41
  10. 830
  11. 219
  12. 100
  13. 965
  14. 60
  15. 914
  16. 299
  17. 167
  18. 183
  19. 941
  20. 987
  21. 200
  22. 148
  23. 137
  24. 688
  25. 515
  26. 405
  27. 166
  28. 19
  29. 222
  30. 86
  31. 585
  32. 921
  33. 850
  34. 160
  35. 870
  36. 194
  37. 701
  38. 864
  39. 746
  40. 37

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