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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 367 · 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. 1.890 + ? = 997
  2. 2.761 + ? = 954
  3. 3.? − 198 = 111
  4. 4.138 + 674 =
  5. 5.189 + 142 =
  6. 6.863 + 129 =
  7. 7.756 + 236 =
  8. 8.582 + ? = 906
  9. 9.328 + ? = 745
  10. 10.313 − 128 =
  11. 11.? + 248 = 920
  12. 12.A train has 348 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  13. 13.? − 472 = 106
  14. 14.177 + 384 =
  15. 15.243 + 176 =
  16. 16.A train has 572 people in the front coaches and 320 people in the back coaches. How many people are on the train?
  17. 17.A school has 310 children. 198 of them are girls. How many boys are there?
  18. 18.? + 644 = 864
  19. 19.A train has 739 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  20. 20.541 + 410 =
  21. 21.? − 143 = 96
  22. 22.360 − ? = 171
  23. 23.205 + 686 =
  24. 24.A train has 751 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  25. 25.867 + ? = 971
  26. 26.A school has 824 children. 599 of them are girls. How many boys are there?
  27. 27.270 + ? = 661
  28. 28.972 − 536 =
  29. 29.A train has 773 people in the front coaches and 192 people in the back coaches. How many people are on the train?
  30. 30.730 − 659 =
  31. 31.? − 598 = 225
  32. 32.A school has 298 children. 225 of them are girls. How many boys are there?
  33. 33.171 + 788 =
  34. 34.315 − ? = 101
  35. 35.787 − 277 =
  36. 36.479 − 243 =
  37. 37.717 − ? = 400
  38. 38.798 − 463 =
  39. 39.A train has 310 people in the front coaches and 536 people in the back coaches. How many people are on the train?
  40. 40.981 − ? = 624

Answer key

  1. 107
  2. 193
  3. 309
  4. 812
  5. 331
  6. 992
  7. 992
  8. 324
  9. 417
  10. 185
  11. 672
  12. 483
  13. 578
  14. 561
  15. 419
  16. 892
  17. 112
  18. 220
  19. 840
  20. 951
  21. 239
  22. 189
  23. 891
  24. 926
  25. 104
  26. 225
  27. 391
  28. 436
  29. 965
  30. 71
  31. 823
  32. 73
  33. 959
  34. 214
  35. 510
  36. 236
  37. 317
  38. 335
  39. 846
  40. 357

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