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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 80 · 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. 1.207 − 145 =
  2. 2.552 + 367 =
  3. 3.339 − 250 =
  4. 4.A train has 433 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  5. 5.395 − ? = 11
  6. 6.? + 470 = 886
  7. 7.434 + 262 =
  8. 8.668 + 205 =
  9. 9.364 − 330 =
  10. 10.A train has 629 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  11. 11.539 − 288 =
  12. 12.507 − 135 =
  13. 13.A train has 761 people in the front coaches and 235 people in the back coaches. How many people are on the train?
  14. 14.383 + 123 =
  15. 15.A train has 332 people in the front coaches and 264 people in the back coaches. How many people are on the train?
  16. 16.? − 228 = 9
  17. 17.A train has 796 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  18. 18.373 + 327 =
  19. 19.A train has 513 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  20. 20.A train has 520 people in the front coaches and 448 people in the back coaches. How many people are on the train?
  21. 21.? + 404 = 644
  22. 22.703 − 504 =
  23. 23.A school has 293 children. 103 of them are girls. How many boys are there?
  24. 24.? + 750 = 890
  25. 25.684 + 273 =
  26. 26.297 − ? = 110
  27. 27.687 + 149 =
  28. 28.877 − 212 =
  29. 29.A school has 495 children. 219 of them are girls. How many boys are there?
  30. 30.103 + 194 =
  31. 31.599 + 371 =
  32. 32.304 − 198 =
  33. 33.598 − ? = 186
  34. 34.A train has 221 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  35. 35.249 − 222 =
  36. 36.986 − 855 =
  37. 37.833 − 447 =
  38. 38.A train has 825 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  39. 39.341 − 332 =
  40. 40.821 − ? = 238

Answer key

  1. 62
  2. 919
  3. 89
  4. 688
  5. 384
  6. 416
  7. 696
  8. 873
  9. 34
  10. 780
  11. 251
  12. 372
  13. 996
  14. 506
  15. 596
  16. 237
  17. 909
  18. 700
  19. 784
  20. 968
  21. 240
  22. 199
  23. 190
  24. 140
  25. 957
  26. 187
  27. 836
  28. 665
  29. 276
  30. 297
  31. 970
  32. 106
  33. 412
  34. 350
  35. 27
  36. 131
  37. 386
  38. 941
  39. 9
  40. 583

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