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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 867 · 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. 1.272 − 253 =
  2. 2.497 + ? = 825
  3. 3.265 + ? = 731
  4. 4.A school has 944 children. 510 of them are girls. How many boys are there?
  5. 5.851 + 117 =
  6. 6.? + 609 = 732
  7. 7.118 + ? = 854
  8. 8.618 − 516 =
  9. 9.? − 121 = 634
  10. 10.A school has 223 children. 185 of them are girls. How many boys are there?
  11. 11.A school has 675 children. 507 of them are girls. How many boys are there?
  12. 12.349 − 242 =
  13. 13.333 + ? = 913
  14. 14.472 − ? = 256
  15. 15.354 + 557 =
  16. 16.454 − 303 =
  17. 17.A school has 956 children. 527 of them are girls. How many boys are there?
  18. 18.A train has 121 people in the front coaches and 714 people in the back coaches. How many people are on the train?
  19. 19.399 + 283 =
  20. 20.263 + ? = 928
  21. 21.634 − 320 =
  22. 22.795 − ? = 50
  23. 23.A school has 589 children. 196 of them are girls. How many boys are there?
  24. 24.? + 811 = 916
  25. 25.486 − 303 =
  26. 26.548 + ? = 768
  27. 27.336 − 118 =
  28. 28.539 + 442 =
  29. 29.299 − 182 =
  30. 30.393 − ? = 265
  31. 31.A school has 340 children. 109 of them are girls. How many boys are there?
  32. 32.A school has 590 children. 516 of them are girls. How many boys are there?
  33. 33.925 − 447 =
  34. 34.276 − 174 =
  35. 35.458 − 208 =
  36. 36.A train has 185 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  37. 37.A train has 566 people in the front coaches and 415 people in the back coaches. How many people are on the train?
  38. 38.A train has 159 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  39. 39.A train has 221 people in the front coaches and 606 people in the back coaches. How many people are on the train?
  40. 40.866 − 221 =

Answer key

  1. 19
  2. 328
  3. 466
  4. 434
  5. 968
  6. 123
  7. 736
  8. 102
  9. 755
  10. 38
  11. 168
  12. 107
  13. 580
  14. 216
  15. 911
  16. 151
  17. 429
  18. 835
  19. 682
  20. 665
  21. 314
  22. 745
  23. 393
  24. 105
  25. 183
  26. 220
  27. 218
  28. 981
  29. 117
  30. 128
  31. 231
  32. 74
  33. 478
  34. 102
  35. 250
  36. 509
  37. 981
  38. 319
  39. 827
  40. 645

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