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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 790 · 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 813 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  2. 2.? − 511 = 262
  3. 3.A school has 633 children. 231 of them are girls. How many boys are there?
  4. 4.726 − 100 =
  5. 5.676 + 226 =
  6. 6.? − 292 = 100
  7. 7.A school has 940 children. 532 of them are girls. How many boys are there?
  8. 8.A school has 546 children. 367 of them are girls. How many boys are there?
  9. 9.684 − 262 =
  10. 10.405 − ? = 67
  11. 11.503 + 417 =
  12. 12.501 − 484 =
  13. 13.975 − ? = 428
  14. 14.316 − ? = 8
  15. 15.A train has 524 people in the front coaches and 332 people in the back coaches. How many people are on the train?
  16. 16.903 − 260 =
  17. 17.A train has 855 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  18. 18.639 + 358 =
  19. 19.A school has 455 children. 219 of them are girls. How many boys are there?
  20. 20.833 + 143 =
  21. 21.749 − 108 =
  22. 22.423 − 331 =
  23. 23.573 − ? = 30
  24. 24.A train has 797 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  25. 25.417 + ? = 794
  26. 26.A school has 502 children. 262 of them are girls. How many boys are there?
  27. 27.656 + ? = 928
  28. 28.581 + ? = 981
  29. 29.A train has 804 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  30. 30.A school has 894 children. 402 of them are girls. How many boys are there?
  31. 31.868 + 123 =
  32. 32.? + 448 = 783
  33. 33.445 − 118 =
  34. 34.294 + 607 =
  35. 35.938 − 154 =
  36. 36.? + 272 = 446
  37. 37.? − 373 = 200
  38. 38.A train has 538 people in the front coaches and 329 people in the back coaches. How many people are on the train?
  39. 39.? − 227 = 400
  40. 40.A train has 776 people in the front coaches and 151 people in the back coaches. How many people are on the train?

Answer key

  1. 957
  2. 773
  3. 402
  4. 626
  5. 902
  6. 392
  7. 408
  8. 179
  9. 422
  10. 338
  11. 920
  12. 17
  13. 547
  14. 308
  15. 856
  16. 643
  17. 986
  18. 997
  19. 236
  20. 976
  21. 641
  22. 92
  23. 543
  24. 919
  25. 377
  26. 240
  27. 272
  28. 400
  29. 940
  30. 492
  31. 991
  32. 335
  33. 327
  34. 901
  35. 784
  36. 174
  37. 573
  38. 867
  39. 627
  40. 927

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