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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 261 · 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. 1.211 + 699 =
  2. 2.? + 747 = 979
  3. 3.? + 705 = 864
  4. 4.837 − ? = 425
  5. 5.A train has 486 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  6. 6.187 + 419 =
  7. 7.740 + 171 =
  8. 8.728 + ? = 845
  9. 9.A school has 357 children. 315 of them are girls. How many boys are there?
  10. 10.? + 663 = 829
  11. 11.? + 711 = 853
  12. 12.? − 379 = 549
  13. 13.834 − 332 =
  14. 14.? + 316 = 937
  15. 15.935 − 926 =
  16. 16.719 − 598 =
  17. 17.513 + 293 =
  18. 18.A train has 720 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  19. 19.297 + ? = 402
  20. 20.658 − ? = 243
  21. 21.? − 451 = 497
  22. 22.? − 212 = 54
  23. 23.396 + ? = 522
  24. 24.? + 811 = 996
  25. 25.A train has 827 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  26. 26.770 + 184 =
  27. 27.A train has 217 people in the front coaches and 693 people in the back coaches. How many people are on the train?
  28. 28.269 + 529 =
  29. 29.A train has 362 people in the front coaches and 348 people in the back coaches. How many people are on the train?
  30. 30.622 − 397 =
  31. 31.758 + 133 =
  32. 32.534 − 157 =
  33. 33.502 − 196 =
  34. 34.A train has 103 people in the front coaches and 205 people in the back coaches. How many people are on the train?
  35. 35.306 + 122 =
  36. 36.? − 556 = 162
  37. 37.512 + ? = 684
  38. 38.A train has 470 people in the front coaches and 351 people in the back coaches. How many people are on the train?
  39. 39.A train has 221 people in the front coaches and 713 people in the back coaches. How many people are on the train?
  40. 40.362 + 224 =

Answer key

  1. 910
  2. 232
  3. 159
  4. 412
  5. 737
  6. 606
  7. 911
  8. 117
  9. 42
  10. 166
  11. 142
  12. 928
  13. 502
  14. 621
  15. 9
  16. 121
  17. 806
  18. 857
  19. 105
  20. 415
  21. 948
  22. 266
  23. 126
  24. 185
  25. 933
  26. 954
  27. 910
  28. 798
  29. 710
  30. 225
  31. 891
  32. 377
  33. 306
  34. 308
  35. 428
  36. 718
  37. 172
  38. 821
  39. 934
  40. 586

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