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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 199 · 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. 1.766 + 118 =
  2. 2.331 − ? = 228
  3. 3.326 − 205 =
  4. 4.306 + ? = 857
  5. 5.468 − 285 =
  6. 6.207 + ? = 905
  7. 7.765 − 542 =
  8. 8.546 + ? = 674
  9. 9.A school has 689 children. 266 of them are girls. How many boys are there?
  10. 10.A train has 505 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  11. 11.434 + ? = 705
  12. 12.A school has 674 children. 527 of them are girls. How many boys are there?
  13. 13.290 − 118 =
  14. 14.? + 516 = 901
  15. 15.A school has 245 children. 170 of them are girls. How many boys are there?
  16. 16.186 + 109 =
  17. 17.272 − ? = 133
  18. 18.? + 454 = 984
  19. 19.599 + 118 =
  20. 20.A train has 658 people in the front coaches and 164 people in the back coaches. How many people are on the train?
  21. 21.A train has 385 people in the front coaches and 455 people in the back coaches. How many people are on the train?
  22. 22.A train has 782 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  23. 23.645 + 199 =
  24. 24.563 + ? = 995
  25. 25.? − 337 = 136
  26. 26.A train has 187 people in the front coaches and 805 people in the back coaches. How many people are on the train?
  27. 27.682 + ? = 937
  28. 28.236 − 168 =
  29. 29.622 + ? = 819
  30. 30.A school has 874 children. 139 of them are girls. How many boys are there?
  31. 31.611 + 177 =
  32. 32.A school has 836 children. 125 of them are girls. How many boys are there?
  33. 33.A school has 240 children. 169 of them are girls. How many boys are there?
  34. 34.959 − 198 =
  35. 35.? + 365 = 534
  36. 36.? − 188 = 99
  37. 37.689 − ? = 4
  38. 38.436 − 118 =
  39. 39.? − 221 = 166
  40. 40.A train has 827 people in the front coaches and 125 people in the back coaches. How many people are on the train?

Answer key

  1. 884
  2. 103
  3. 121
  4. 551
  5. 183
  6. 698
  7. 223
  8. 128
  9. 423
  10. 645
  11. 271
  12. 147
  13. 172
  14. 385
  15. 75
  16. 295
  17. 139
  18. 530
  19. 717
  20. 822
  21. 840
  22. 923
  23. 844
  24. 432
  25. 473
  26. 992
  27. 255
  28. 68
  29. 197
  30. 735
  31. 788
  32. 711
  33. 71
  34. 761
  35. 169
  36. 287
  37. 685
  38. 318
  39. 387
  40. 952

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