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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 209 · 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. 1.846 + 145 =
  2. 2.868 + 129 =
  3. 3.? + 818 = 972
  4. 4.797 − ? = 128
  5. 5.A school has 345 children. 251 of them are girls. How many boys are there?
  6. 6.A school has 385 children. 336 of them are girls. How many boys are there?
  7. 7.652 − 462 =
  8. 8.628 − 363 =
  9. 9.289 − 216 =
  10. 10.A train has 652 people in the front coaches and 333 people in the back coaches. How many people are on the train?
  11. 11.A train has 210 people in the front coaches and 302 people in the back coaches. How many people are on the train?
  12. 12.A train has 461 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  13. 13.976 − 490 =
  14. 14.A train has 113 people in the front coaches and 677 people in the back coaches. How many people are on the train?
  15. 15.971 − ? = 693
  16. 16.783 + ? = 919
  17. 17.793 + ? = 937
  18. 18.517 + 115 =
  19. 19.536 − 302 =
  20. 20.? − 851 = 86
  21. 21.566 + 400 =
  22. 22.540 + 275 =
  23. 23.A school has 894 children. 315 of them are girls. How many boys are there?
  24. 24.522 + 233 =
  25. 25.177 + 563 =
  26. 26.? − 464 = 303
  27. 27.904 − 200 =
  28. 28.372 − 149 =
  29. 29.A train has 206 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  30. 30.A school has 906 children. 582 of them are girls. How many boys are there?
  31. 31.344 − 220 =
  32. 32.? + 313 = 961
  33. 33.246 + 416 =
  34. 34.581 − 455 =
  35. 35.227 + 761 =
  36. 36.939 − 634 =
  37. 37.410 + ? = 628
  38. 38.320 + 617 =
  39. 39.A school has 875 children. 189 of them are girls. How many boys are there?
  40. 40.618 + 336 =

Answer key

  1. 991
  2. 997
  3. 154
  4. 669
  5. 94
  6. 49
  7. 190
  8. 265
  9. 73
  10. 985
  11. 512
  12. 769
  13. 486
  14. 790
  15. 278
  16. 136
  17. 144
  18. 632
  19. 234
  20. 937
  21. 966
  22. 815
  23. 579
  24. 755
  25. 740
  26. 767
  27. 704
  28. 223
  29. 482
  30. 324
  31. 124
  32. 648
  33. 662
  34. 126
  35. 988
  36. 305
  37. 218
  38. 937
  39. 686
  40. 954

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