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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 687 · 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. 1.250 − ? = 128
  2. 2.A train has 266 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  3. 3.203 − 148 =
  4. 4.505 − 276 =
  5. 5.405 + 541 =
  6. 6.255 + 704 =
  7. 7.? + 381 = 932
  8. 8.545 + 348 =
  9. 9.240 + 648 =
  10. 10.A school has 471 children. 213 of them are girls. How many boys are there?
  11. 11.241 − 131 =
  12. 12.218 − ? = 77
  13. 13.141 + 167 =
  14. 14.A school has 415 children. 269 of them are girls. How many boys are there?
  15. 15.246 − 114 =
  16. 16.A school has 933 children. 317 of them are girls. How many boys are there?
  17. 17.? − 219 = 268
  18. 18.535 − 243 =
  19. 19.A school has 617 children. 378 of them are girls. How many boys are there?
  20. 20.595 + 372 =
  21. 21.A school has 522 children. 111 of them are girls. How many boys are there?
  22. 22.A school has 672 children. 321 of them are girls. How many boys are there?
  23. 23.469 + ? = 732
  24. 24.? − 260 = 417
  25. 25.798 − 133 =
  26. 26.A school has 927 children. 476 of them are girls. How many boys are there?
  27. 27.A train has 710 people in the front coaches and 134 people in the back coaches. How many people are on the train?
  28. 28.A train has 108 people in the front coaches and 564 people in the back coaches. How many people are on the train?
  29. 29.436 + 338 =
  30. 30.359 + ? = 565
  31. 31.433 + 514 =
  32. 32.498 + 401 =
  33. 33.A train has 568 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  34. 34.A school has 230 children. 229 of them are girls. How many boys are there?
  35. 35.? + 591 = 761
  36. 36.? − 140 = 807
  37. 37.737 + 201 =
  38. 38.265 − ? = 157
  39. 39.? + 296 = 659
  40. 40.822 − 525 =

Answer key

  1. 122
  2. 378
  3. 55
  4. 229
  5. 946
  6. 959
  7. 551
  8. 893
  9. 888
  10. 258
  11. 110
  12. 141
  13. 308
  14. 146
  15. 132
  16. 616
  17. 487
  18. 292
  19. 239
  20. 967
  21. 411
  22. 351
  23. 263
  24. 677
  25. 665
  26. 451
  27. 844
  28. 672
  29. 774
  30. 206
  31. 947
  32. 899
  33. 684
  34. 1
  35. 170
  36. 947
  37. 938
  38. 108
  39. 363
  40. 297

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