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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 742 · 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.A train has 331 people in the front coaches and 652 people in the back coaches. How many people are on the train?
  2. 2.A school has 666 children. 661 of them are girls. How many boys are there?
  3. 3.965 − 946 =
  4. 4.? − 103 = 224
  5. 5.802 − 504 =
  6. 6.? + 655 = 995
  7. 7.A train has 477 people in the front coaches and 367 people in the back coaches. How many people are on the train?
  8. 8.A school has 372 children. 251 of them are girls. How many boys are there?
  9. 9.A train has 684 people in the front coaches and 282 people in the back coaches. How many people are on the train?
  10. 10.? + 330 = 664
  11. 11.A school has 664 children. 214 of them are girls. How many boys are there?
  12. 12.201 − 181 =
  13. 13.A train has 858 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  14. 14.A school has 903 children. 639 of them are girls. How many boys are there?
  15. 15.557 + 205 =
  16. 16.A school has 352 children. 244 of them are girls. How many boys are there?
  17. 17.A school has 218 children. 139 of them are girls. How many boys are there?
  18. 18.970 − 880 =
  19. 19.A train has 718 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  20. 20.A school has 829 children. 232 of them are girls. How many boys are there?
  21. 21.A train has 553 people in the front coaches and 348 people in the back coaches. How many people are on the train?
  22. 22.521 − 227 =
  23. 23.A train has 552 people in the front coaches and 334 people in the back coaches. How many people are on the train?
  24. 24.388 + ? = 888
  25. 25.278 − 139 =
  26. 26.? − 280 = 697
  27. 27.A train has 279 people in the front coaches and 690 people in the back coaches. How many people are on the train?
  28. 28.A train has 574 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  29. 29.628 − ? = 366
  30. 30.293 + 283 =
  31. 31.458 + 503 =
  32. 32.696 − 544 =
  33. 33.687 − ? = 225
  34. 34.? − 207 = 369
  35. 35.A train has 106 people in the front coaches and 684 people in the back coaches. How many people are on the train?
  36. 36.774 + ? = 884
  37. 37.A train has 808 people in the front coaches and 175 people in the back coaches. How many people are on the train?
  38. 38.A school has 739 children. 174 of them are girls. How many boys are there?
  39. 39.786 − 540 =
  40. 40.339 − 304 =

Answer key

  1. 983
  2. 5
  3. 19
  4. 327
  5. 298
  6. 340
  7. 844
  8. 121
  9. 966
  10. 334
  11. 450
  12. 20
  13. 964
  14. 264
  15. 762
  16. 108
  17. 79
  18. 90
  19. 827
  20. 597
  21. 901
  22. 294
  23. 886
  24. 500
  25. 139
  26. 977
  27. 969
  28. 736
  29. 262
  30. 576
  31. 961
  32. 152
  33. 462
  34. 576
  35. 790
  36. 110
  37. 983
  38. 565
  39. 246
  40. 35

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