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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 161 · 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.? − 483 = 105
  2. 2.A school has 676 children. 135 of them are girls. How many boys are there?
  3. 3.? − 233 = 19
  4. 4.? + 157 = 922
  5. 5.845 + 109 =
  6. 6.A train has 331 people in the front coaches and 504 people in the back coaches. How many people are on the train?
  7. 7.586 − 342 =
  8. 8.222 + 420 =
  9. 9.244 + 720 =
  10. 10.? + 154 = 896
  11. 11.A train has 220 people in the front coaches and 379 people in the back coaches. How many people are on the train?
  12. 12.A school has 842 children. 833 of them are girls. How many boys are there?
  13. 13.810 − ? = 645
  14. 14.384 − 252 =
  15. 15.316 − 161 =
  16. 16.627 + ? = 952
  17. 17.429 + 131 =
  18. 18.874 − ? = 635
  19. 19.A school has 262 children. 143 of them are girls. How many boys are there?
  20. 20.A train has 718 people in the front coaches and 138 people in the back coaches. How many people are on the train?
  21. 21.711 + 265 =
  22. 22.? − 150 = 108
  23. 23.A school has 305 children. 218 of them are girls. How many boys are there?
  24. 24.810 − ? = 657
  25. 25.906 − 761 =
  26. 26.A train has 624 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  27. 27.? + 317 = 816
  28. 28.A train has 123 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  29. 29.791 − ? = 123
  30. 30.297 + 363 =
  31. 31.? + 302 = 825
  32. 32.304 − 144 =
  33. 33.A train has 101 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  34. 34.? + 429 = 581
  35. 35.A school has 816 children. 506 of them are girls. How many boys are there?
  36. 36.? + 333 = 710
  37. 37.215 − 192 =
  38. 38.224 + 485 =
  39. 39.A school has 341 children. 154 of them are girls. How many boys are there?
  40. 40.778 + 111 =

Answer key

  1. 588
  2. 541
  3. 252
  4. 765
  5. 954
  6. 835
  7. 244
  8. 642
  9. 964
  10. 742
  11. 599
  12. 9
  13. 165
  14. 132
  15. 155
  16. 325
  17. 560
  18. 239
  19. 119
  20. 856
  21. 976
  22. 258
  23. 87
  24. 153
  25. 145
  26. 994
  27. 499
  28. 262
  29. 668
  30. 660
  31. 523
  32. 160
  33. 317
  34. 152
  35. 310
  36. 377
  37. 23
  38. 709
  39. 187
  40. 889

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