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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 337 · 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.? − 225 = 292
  2. 2.A school has 213 children. 169 of them are girls. How many boys are there?
  3. 3.521 + 376 =
  4. 4.108 + 405 =
  5. 5.874 − 490 =
  6. 6.A school has 610 children. 230 of them are girls. How many boys are there?
  7. 7.A train has 729 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  8. 8.A train has 121 people in the front coaches and 305 people in the back coaches. How many people are on the train?
  9. 9.? − 195 = 257
  10. 10.A school has 490 children. 142 of them are girls. How many boys are there?
  11. 11.907 − ? = 632
  12. 12.326 − 107 =
  13. 13.A school has 399 children. 242 of them are girls. How many boys are there?
  14. 14.A school has 646 children. 302 of them are girls. How many boys are there?
  15. 15.413 + ? = 633
  16. 16.A school has 626 children. 380 of them are girls. How many boys are there?
  17. 17.A school has 819 children. 136 of them are girls. How many boys are there?
  18. 18.777 − 132 =
  19. 19.651 + 318 =
  20. 20.A school has 483 children. 354 of them are girls. How many boys are there?
  21. 21.A school has 598 children. 402 of them are girls. How many boys are there?
  22. 22.A school has 981 children. 354 of them are girls. How many boys are there?
  23. 23.320 − ? = 130
  24. 24.452 − ? = 6
  25. 25.853 − ? = 637
  26. 26.? + 626 = 905
  27. 27.888 − 425 =
  28. 28.282 + 711 =
  29. 29.345 − ? = 49
  30. 30.521 + ? = 621
  31. 31.? − 181 = 574
  32. 32.A train has 779 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  33. 33.792 + ? = 945
  34. 34.112 + 652 =
  35. 35.506 + 411 =
  36. 36.491 + 281 =
  37. 37.348 + 429 =
  38. 38.195 + 663 =
  39. 39.? − 514 = 185
  40. 40.380 − ? = 1

Answer key

  1. 517
  2. 44
  3. 897
  4. 513
  5. 384
  6. 380
  7. 869
  8. 426
  9. 452
  10. 348
  11. 275
  12. 219
  13. 157
  14. 344
  15. 220
  16. 246
  17. 683
  18. 645
  19. 969
  20. 129
  21. 196
  22. 627
  23. 190
  24. 446
  25. 216
  26. 279
  27. 463
  28. 993
  29. 296
  30. 100
  31. 755
  32. 880
  33. 153
  34. 764
  35. 917
  36. 772
  37. 777
  38. 858
  39. 699
  40. 379

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