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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 682 · 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. 1.610 − ? = 405
  2. 2.A train has 414 people in the front coaches and 522 people in the back coaches. How many people are on the train?
  3. 3.? + 240 = 571
  4. 4.615 + ? = 899
  5. 5.231 − ? = 53
  6. 6.? + 329 = 986
  7. 7.576 + 280 =
  8. 8.A train has 180 people in the front coaches and 556 people in the back coaches. How many people are on the train?
  9. 9.A school has 251 children. 235 of them are girls. How many boys are there?
  10. 10.123 + 659 =
  11. 11.? + 141 = 621
  12. 12.805 − ? = 563
  13. 13.301 + 232 =
  14. 14.783 + ? = 885
  15. 15.A school has 203 children. 145 of them are girls. How many boys are there?
  16. 16.599 + 239 =
  17. 17.391 + 109 =
  18. 18.A school has 526 children. 107 of them are girls. How many boys are there?
  19. 19.A school has 290 children. 244 of them are girls. How many boys are there?
  20. 20.709 − 537 =
  21. 21.345 − ? = 166
  22. 22.509 + 228 =
  23. 23.263 + 582 =
  24. 24.330 − 151 =
  25. 25.398 + ? = 855
  26. 26.A train has 430 people in the front coaches and 488 people in the back coaches. How many people are on the train?
  27. 27.726 + ? = 856
  28. 28.A train has 503 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  29. 29.277 + 303 =
  30. 30.894 + 104 =
  31. 31.A school has 259 children. 158 of them are girls. How many boys are there?
  32. 32.409 − ? = 175
  33. 33.A train has 213 people in the front coaches and 458 people in the back coaches. How many people are on the train?
  34. 34.867 + 104 =
  35. 35.A train has 341 people in the front coaches and 275 people in the back coaches. How many people are on the train?
  36. 36.A school has 703 children. 621 of them are girls. How many boys are there?
  37. 37.A train has 405 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  38. 38.399 − 347 =
  39. 39.A school has 445 children. 293 of them are girls. How many boys are there?
  40. 40.156 + 633 =

Answer key

  1. 205
  2. 936
  3. 331
  4. 284
  5. 178
  6. 657
  7. 856
  8. 736
  9. 16
  10. 782
  11. 480
  12. 242
  13. 533
  14. 102
  15. 58
  16. 838
  17. 500
  18. 419
  19. 46
  20. 172
  21. 179
  22. 737
  23. 845
  24. 179
  25. 457
  26. 918
  27. 130
  28. 632
  29. 580
  30. 998
  31. 101
  32. 234
  33. 671
  34. 971
  35. 616
  36. 82
  37. 594
  38. 52
  39. 152
  40. 789

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