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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 14 · 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.? + 809 = 945
  2. 2.780 + 215 =
  3. 3.438 − 177 =
  4. 4.368 + 304 =
  5. 5.A train has 375 people in the front coaches and 468 people in the back coaches. How many people are on the train?
  6. 6.? − 130 = 277
  7. 7.? − 564 = 182
  8. 8.? + 678 = 888
  9. 9.630 + 254 =
  10. 10.? + 137 = 435
  11. 11.A train has 419 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  12. 12.881 − 137 =
  13. 13.A train has 149 people in the front coaches and 517 people in the back coaches. How many people are on the train?
  14. 14.370 + ? = 508
  15. 15.? + 635 = 788
  16. 16.419 + 152 =
  17. 17.904 − ? = 16
  18. 18.622 − ? = 340
  19. 19.296 + ? = 457
  20. 20.281 − 260 =
  21. 21.159 + 618 =
  22. 22.A train has 881 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  23. 23.458 − 371 =
  24. 24.612 − 266 =
  25. 25.350 + ? = 690
  26. 26.A school has 320 children. 113 of them are girls. How many boys are there?
  27. 27.A train has 659 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  28. 28.832 + 123 =
  29. 29.193 + 247 =
  30. 30.402 + ? = 973
  31. 31.418 − 204 =
  32. 32.644 + 171 =
  33. 33.? + 201 = 356
  34. 34.225 + 254 =
  35. 35.A school has 934 children. 102 of them are girls. How many boys are there?
  36. 36.A train has 228 people in the front coaches and 300 people in the back coaches. How many people are on the train?
  37. 37.A train has 879 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  38. 38.A train has 496 people in the front coaches and 262 people in the back coaches. How many people are on the train?
  39. 39.794 + 192 =
  40. 40.? − 539 = 216

Answer key

  1. 136
  2. 995
  3. 261
  4. 672
  5. 843
  6. 407
  7. 746
  8. 210
  9. 884
  10. 298
  11. 725
  12. 744
  13. 666
  14. 138
  15. 153
  16. 571
  17. 888
  18. 282
  19. 161
  20. 21
  21. 777
  22. 989
  23. 87
  24. 346
  25. 340
  26. 207
  27. 887
  28. 955
  29. 440
  30. 571
  31. 214
  32. 815
  33. 155
  34. 479
  35. 832
  36. 528
  37. 984
  38. 758
  39. 986
  40. 755

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