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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 513 · 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. 1.262 + 283 =
  2. 2.331 + 148 =
  3. 3.A school has 889 children. 255 of them are girls. How many boys are there?
  4. 4.A train has 678 people in the front coaches and 132 people in the back coaches. How many people are on the train?
  5. 5.A school has 620 children. 259 of them are girls. How many boys are there?
  6. 6.A school has 252 children. 153 of them are girls. How many boys are there?
  7. 7.417 − ? = 105
  8. 8.? − 372 = 22
  9. 9.219 + ? = 685
  10. 10.608 + 186 =
  11. 11.? + 639 = 779
  12. 12.A school has 814 children. 740 of them are girls. How many boys are there?
  13. 13.272 + ? = 479
  14. 14.224 − ? = 67
  15. 15.444 − 279 =
  16. 16.353 − 311 =
  17. 17.? + 605 = 766
  18. 18.337 − 296 =
  19. 19.291 − 233 =
  20. 20.864 + 119 =
  21. 21.A school has 783 children. 239 of them are girls. How many boys are there?
  22. 22.383 + ? = 514
  23. 23.A school has 201 children. 134 of them are girls. How many boys are there?
  24. 24.? − 188 = 69
  25. 25.A school has 732 children. 271 of them are girls. How many boys are there?
  26. 26.530 − ? = 254
  27. 27.887 − 618 =
  28. 28.797 − 333 =
  29. 29.A train has 837 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  30. 30.? − 130 = 119
  31. 31.380 − ? = 233
  32. 32.A train has 215 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  33. 33.546 + 301 =
  34. 34.A train has 257 people in the front coaches and 347 people in the back coaches. How many people are on the train?
  35. 35.A school has 667 children. 252 of them are girls. How many boys are there?
  36. 36.572 − 138 =
  37. 37.723 + 266 =
  38. 38.829 + ? = 931
  39. 39.A school has 744 children. 271 of them are girls. How many boys are there?
  40. 40.383 − 316 =

Answer key

  1. 545
  2. 479
  3. 634
  4. 810
  5. 361
  6. 99
  7. 312
  8. 394
  9. 466
  10. 794
  11. 140
  12. 74
  13. 207
  14. 157
  15. 165
  16. 42
  17. 161
  18. 41
  19. 58
  20. 983
  21. 544
  22. 131
  23. 67
  24. 257
  25. 461
  26. 276
  27. 269
  28. 464
  29. 991
  30. 249
  31. 147
  32. 569
  33. 847
  34. 604
  35. 415
  36. 434
  37. 989
  38. 102
  39. 473
  40. 67

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