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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 315 · 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 457 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  2. 2.A train has 239 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  3. 3.A train has 254 people in the front coaches and 225 people in the back coaches. How many people are on the train?
  4. 4.400 + 476 =
  5. 5.161 + ? = 392
  6. 6.469 + 293 =
  7. 7.845 − 794 =
  8. 8.757 + ? = 877
  9. 9.A school has 767 children. 329 of them are girls. How many boys are there?
  10. 10.A school has 472 children. 252 of them are girls. How many boys are there?
  11. 11.670 + 206 =
  12. 12.749 − 173 =
  13. 13.562 + ? = 712
  14. 14.A school has 958 children. 677 of them are girls. How many boys are there?
  15. 15.830 + ? = 983
  16. 16.666 + 323 =
  17. 17.504 − 399 =
  18. 18.219 + ? = 781
  19. 19.A school has 251 children. 231 of them are girls. How many boys are there?
  20. 20.662 − 498 =
  21. 21.436 + 103 =
  22. 22.A school has 819 children. 743 of them are girls. How many boys are there?
  23. 23.863 − ? = 414
  24. 24.428 + 195 =
  25. 25.A train has 809 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  26. 26.999 − ? = 171
  27. 27.A train has 129 people in the front coaches and 685 people in the back coaches. How many people are on the train?
  28. 28.A train has 325 people in the front coaches and 552 people in the back coaches. How many people are on the train?
  29. 29.623 − 258 =
  30. 30.827 + ? = 946
  31. 31.679 + ? = 858
  32. 32.833 − 568 =
  33. 33.775 + 219 =
  34. 34.269 + 577 =
  35. 35.? − 125 = 338
  36. 36.878 − ? = 610
  37. 37.A school has 346 children. 163 of them are girls. How many boys are there?
  38. 38.? + 764 = 885
  39. 39.A train has 649 people in the front coaches and 307 people in the back coaches. How many people are on the train?
  40. 40.424 − 114 =

Answer key

  1. 572
  2. 360
  3. 479
  4. 876
  5. 231
  6. 762
  7. 51
  8. 120
  9. 438
  10. 220
  11. 876
  12. 576
  13. 150
  14. 281
  15. 153
  16. 989
  17. 105
  18. 562
  19. 20
  20. 164
  21. 539
  22. 76
  23. 449
  24. 623
  25. 923
  26. 828
  27. 814
  28. 877
  29. 365
  30. 119
  31. 179
  32. 265
  33. 994
  34. 846
  35. 463
  36. 268
  37. 183
  38. 121
  39. 956
  40. 310

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