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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 39 · 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. 1.936 − 108 =
  2. 2.239 + 164 =
  3. 3.903 − 659 =
  4. 4.? − 230 = 299
  5. 5.345 − ? = 7
  6. 6.A train has 510 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  7. 7.243 − ? = 111
  8. 8.A train has 232 people in the front coaches and 484 people in the back coaches. How many people are on the train?
  9. 9.554 + 404 =
  10. 10.425 + 174 =
  11. 11.347 − 283 =
  12. 12.143 + 663 =
  13. 13.697 − ? = 119
  14. 14.348 + 102 =
  15. 15.211 − 190 =
  16. 16.660 − ? = 330
  17. 17.A train has 183 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  18. 18.537 + 111 =
  19. 19.A train has 133 people in the front coaches and 173 people in the back coaches. How many people are on the train?
  20. 20.833 + ? = 984
  21. 21.195 + ? = 800
  22. 22.579 − 110 =
  23. 23.A school has 827 children. 507 of them are girls. How many boys are there?
  24. 24.502 + ? = 857
  25. 25.106 + ? = 535
  26. 26.841 − 472 =
  27. 27.588 − ? = 473
  28. 28.327 + 378 =
  29. 29.A train has 244 people in the front coaches and 639 people in the back coaches. How many people are on the train?
  30. 30.417 + 230 =
  31. 31.714 − 610 =
  32. 32.A train has 130 people in the front coaches and 298 people in the back coaches. How many people are on the train?
  33. 33.A train has 135 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  34. 34.? − 191 = 631
  35. 35.557 − 347 =
  36. 36.A train has 279 people in the front coaches and 331 people in the back coaches. How many people are on the train?
  37. 37.A train has 872 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  38. 38.589 + ? = 720
  39. 39.A train has 257 people in the front coaches and 384 people in the back coaches. How many people are on the train?
  40. 40.788 + 123 =

Answer key

  1. 828
  2. 403
  3. 244
  4. 529
  5. 338
  6. 780
  7. 132
  8. 716
  9. 958
  10. 599
  11. 64
  12. 806
  13. 578
  14. 450
  15. 21
  16. 330
  17. 308
  18. 648
  19. 306
  20. 151
  21. 605
  22. 469
  23. 320
  24. 355
  25. 429
  26. 369
  27. 115
  28. 705
  29. 883
  30. 647
  31. 104
  32. 428
  33. 390
  34. 822
  35. 210
  36. 610
  37. 976
  38. 131
  39. 641
  40. 911

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