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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 843 · 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 train has 662 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  2. 2.266 − 174 =
  3. 3.356 − 220 =
  4. 4.510 − 337 =
  5. 5.A train has 123 people in the front coaches and 788 people in the back coaches. How many people are on the train?
  6. 6.? − 111 = 218
  7. 7.404 − ? = 58
  8. 8.756 + 170 =
  9. 9.776 + 214 =
  10. 10.282 − ? = 28
  11. 11.216 − 167 =
  12. 12.A school has 467 children. 407 of them are girls. How many boys are there?
  13. 13.278 + 338 =
  14. 14.A school has 474 children. 358 of them are girls. How many boys are there?
  15. 15.645 + ? = 840
  16. 16.174 + 709 =
  17. 17.587 + 302 =
  18. 18.A train has 560 people in the front coaches and 320 people in the back coaches. How many people are on the train?
  19. 19.514 + 467 =
  20. 20.? − 180 = 353
  21. 21.734 − 709 =
  22. 22.799 − 718 =
  23. 23.A train has 197 people in the front coaches and 292 people in the back coaches. How many people are on the train?
  24. 24.133 + 129 =
  25. 25.328 + 165 =
  26. 26.? + 815 = 997
  27. 27.? − 113 = 687
  28. 28.461 − 284 =
  29. 29.665 − ? = 435
  30. 30.657 + ? = 874
  31. 31.A school has 384 children. 326 of them are girls. How many boys are there?
  32. 32.945 − 275 =
  33. 33.A school has 426 children. 313 of them are girls. How many boys are there?
  34. 34.281 − 150 =
  35. 35.A train has 336 people in the front coaches and 379 people in the back coaches. How many people are on the train?
  36. 36.A train has 842 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  37. 37.? + 270 = 568
  38. 38.582 − 491 =
  39. 39.A school has 660 children. 548 of them are girls. How many boys are there?
  40. 40.134 + 864 =

Answer key

  1. 793
  2. 92
  3. 136
  4. 173
  5. 911
  6. 329
  7. 346
  8. 926
  9. 990
  10. 254
  11. 49
  12. 60
  13. 616
  14. 116
  15. 195
  16. 883
  17. 889
  18. 880
  19. 981
  20. 533
  21. 25
  22. 81
  23. 489
  24. 262
  25. 493
  26. 182
  27. 800
  28. 177
  29. 230
  30. 217
  31. 58
  32. 670
  33. 113
  34. 131
  35. 715
  36. 965
  37. 298
  38. 91
  39. 112
  40. 998

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