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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 552 · 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. 1.533 − 131 =
  2. 2.243 + 643 =
  3. 3.A school has 206 children. 124 of them are girls. How many boys are there?
  4. 4.208 + ? = 727
  5. 5.243 − ? = 19
  6. 6.A school has 448 children. 417 of them are girls. How many boys are there?
  7. 7.556 − 137 =
  8. 8.224 − ? = 86
  9. 9.184 + 469 =
  10. 10.? + 139 = 740
  11. 11.607 + 166 =
  12. 12.691 + ? = 906
  13. 13.A school has 341 children. 219 of them are girls. How many boys are there?
  14. 14.211 + 200 =
  15. 15.833 − 208 =
  16. 16.A train has 276 people in the front coaches and 651 people in the back coaches. How many people are on the train?
  17. 17.A train has 704 people in the front coaches and 189 people in the back coaches. How many people are on the train?
  18. 18.185 + 401 =
  19. 19.A school has 473 children. 423 of them are girls. How many boys are there?
  20. 20.892 − ? = 510
  21. 21.A school has 485 children. 167 of them are girls. How many boys are there?
  22. 22.314 + ? = 415
  23. 23.197 + ? = 641
  24. 24.228 − 123 =
  25. 25.A train has 405 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  26. 26.587 + 139 =
  27. 27.? − 454 = 94
  28. 28.907 − 745 =
  29. 29.A school has 284 children. 177 of them are girls. How many boys are there?
  30. 30.231 + 347 =
  31. 31.767 + ? = 938
  32. 32.? + 328 = 582
  33. 33.A school has 625 children. 172 of them are girls. How many boys are there?
  34. 34.A school has 312 children. 155 of them are girls. How many boys are there?
  35. 35.A school has 226 children. 140 of them are girls. How many boys are there?
  36. 36.514 + ? = 640
  37. 37.461 − 235 =
  38. 38.A train has 431 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  39. 39.A train has 723 people in the front coaches and 208 people in the back coaches. How many people are on the train?
  40. 40.351 + 489 =

Answer key

  1. 402
  2. 886
  3. 82
  4. 519
  5. 224
  6. 31
  7. 419
  8. 138
  9. 653
  10. 601
  11. 773
  12. 215
  13. 122
  14. 411
  15. 625
  16. 927
  17. 893
  18. 586
  19. 50
  20. 382
  21. 318
  22. 101
  23. 444
  24. 105
  25. 675
  26. 726
  27. 548
  28. 162
  29. 107
  30. 578
  31. 171
  32. 254
  33. 453
  34. 157
  35. 86
  36. 126
  37. 226
  38. 725
  39. 931
  40. 840

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