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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 45 · 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.A school has 395 children. 314 of them are girls. How many boys are there?
  2. 2.A train has 653 people in the front coaches and 341 people in the back coaches. How many people are on the train?
  3. 3.? + 691 = 901
  4. 4.594 + 291 =
  5. 5.581 + ? = 850
  6. 6.? − 624 = 23
  7. 7.665 − 625 =
  8. 8.A school has 302 children. 167 of them are girls. How many boys are there?
  9. 9.757 − ? = 565
  10. 10.? − 264 = 563
  11. 11.A school has 373 children. 212 of them are girls. How many boys are there?
  12. 12.265 − ? = 100
  13. 13.201 − 193 =
  14. 14.935 − 443 =
  15. 15.864 + 129 =
  16. 16.A school has 949 children. 392 of them are girls. How many boys are there?
  17. 17.801 − 274 =
  18. 18.A train has 385 people in the front coaches and 461 people in the back coaches. How many people are on the train?
  19. 19.794 − ? = 587
  20. 20.A train has 343 people in the front coaches and 500 people in the back coaches. How many people are on the train?
  21. 21.610 + 149 =
  22. 22.913 − 846 =
  23. 23.624 + 309 =
  24. 24.A school has 419 children. 299 of them are girls. How many boys are there?
  25. 25.455 − 418 =
  26. 26.148 + ? = 395
  27. 27.? − 218 = 628
  28. 28.766 − ? = 560
  29. 29.? + 867 = 993
  30. 30.470 − 159 =
  31. 31.261 + 303 =
  32. 32.581 + 230 =
  33. 33.221 + 676 =
  34. 34.A school has 908 children. 900 of them are girls. How many boys are there?
  35. 35.797 + 101 =
  36. 36.617 − ? = 309
  37. 37.235 − ? = 36
  38. 38.? + 166 = 476
  39. 39.758 − ? = 310
  40. 40.A train has 700 people in the front coaches and 257 people in the back coaches. How many people are on the train?

Answer key

  1. 81
  2. 994
  3. 210
  4. 885
  5. 269
  6. 647
  7. 40
  8. 135
  9. 192
  10. 827
  11. 161
  12. 165
  13. 8
  14. 492
  15. 993
  16. 557
  17. 527
  18. 846
  19. 207
  20. 843
  21. 759
  22. 67
  23. 933
  24. 120
  25. 37
  26. 247
  27. 846
  28. 206
  29. 126
  30. 311
  31. 564
  32. 811
  33. 897
  34. 8
  35. 898
  36. 308
  37. 199
  38. 310
  39. 448
  40. 957

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