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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 125 · 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 783 people in the front coaches and 186 people in the back coaches. How many people are on the train?
  2. 2.557 + ? = 960
  3. 3.A school has 812 children. 103 of them are girls. How many boys are there?
  4. 4.443 − ? = 343
  5. 5.304 − ? = 109
  6. 6.424 − ? = 229
  7. 7.833 − ? = 575
  8. 8.A train has 710 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  9. 9.703 − ? = 271
  10. 10.A school has 697 children. 187 of them are girls. How many boys are there?
  11. 11.A train has 524 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  12. 12.327 − ? = 41
  13. 13.517 + 185 =
  14. 14.273 + 586 =
  15. 15.A train has 309 people in the front coaches and 592 people in the back coaches. How many people are on the train?
  16. 16.285 + 430 =
  17. 17.161 + 814 =
  18. 18.323 − ? = 102
  19. 19.A train has 864 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  20. 20.939 − 519 =
  21. 21.A school has 951 children. 867 of them are girls. How many boys are there?
  22. 22.471 + 264 =
  23. 23.682 + 259 =
  24. 24.A train has 263 people in the front coaches and 566 people in the back coaches. How many people are on the train?
  25. 25.A school has 961 children. 121 of them are girls. How many boys are there?
  26. 26.860 + 137 =
  27. 27.? + 660 = 930
  28. 28.476 + 360 =
  29. 29.? − 132 = 177
  30. 30.352 + 498 =
  31. 31.A school has 209 children. 100 of them are girls. How many boys are there?
  32. 32.A train has 202 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  33. 33.A train has 857 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  34. 34.282 − 151 =
  35. 35.? − 252 = 40
  36. 36.? − 113 = 655
  37. 37.685 + 143 =
  38. 38.331 + ? = 656
  39. 39.456 + 203 =
  40. 40.A school has 591 children. 546 of them are girls. How many boys are there?

Answer key

  1. 969
  2. 403
  3. 709
  4. 100
  5. 195
  6. 195
  7. 258
  8. 835
  9. 432
  10. 510
  11. 625
  12. 286
  13. 702
  14. 859
  15. 901
  16. 715
  17. 975
  18. 221
  19. 975
  20. 420
  21. 84
  22. 735
  23. 941
  24. 829
  25. 840
  26. 997
  27. 270
  28. 836
  29. 309
  30. 850
  31. 109
  32. 397
  33. 992
  34. 131
  35. 292
  36. 768
  37. 828
  38. 325
  39. 659
  40. 45

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