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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 46 · 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. 1.379 + 451 =
  2. 2.704 − 335 =
  3. 3.814 − ? = 306
  4. 4.A train has 300 people in the front coaches and 562 people in the back coaches. How many people are on the train?
  5. 5.754 + 169 =
  6. 6.A school has 333 children. 249 of them are girls. How many boys are there?
  7. 7.223 − 173 =
  8. 8.548 − ? = 417
  9. 9.? + 519 = 766
  10. 10.? − 686 = 221
  11. 11.318 − ? = 96
  12. 12.561 + 313 =
  13. 13.? + 152 = 804
  14. 14.A train has 456 people in the front coaches and 508 people in the back coaches. How many people are on the train?
  15. 15.892 − 418 =
  16. 16.983 − 273 =
  17. 17.A train has 302 people in the front coaches and 683 people in the back coaches. How many people are on the train?
  18. 18.275 + 512 =
  19. 19.896 + 101 =
  20. 20.A school has 561 children. 139 of them are girls. How many boys are there?
  21. 21.A train has 821 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  22. 22.424 − 235 =
  23. 23.A train has 798 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  24. 24.524 + ? = 968
  25. 25.A school has 720 children. 536 of them are girls. How many boys are there?
  26. 26.? − 295 = 10
  27. 27.328 − ? = 204
  28. 28.A train has 127 people in the front coaches and 221 people in the back coaches. How many people are on the train?
  29. 29.A train has 384 people in the front coaches and 604 people in the back coaches. How many people are on the train?
  30. 30.755 + 171 =
  31. 31.A school has 597 children. 381 of them are girls. How many boys are there?
  32. 32.887 + ? = 997
  33. 33.413 − 382 =
  34. 34.219 − 168 =
  35. 35.265 + ? = 878
  36. 36.986 − 963 =
  37. 37.733 + ? = 977
  38. 38.? + 221 = 992
  39. 39.? + 137 = 274
  40. 40.139 + ? = 823

Answer key

  1. 830
  2. 369
  3. 508
  4. 862
  5. 923
  6. 84
  7. 50
  8. 131
  9. 247
  10. 907
  11. 222
  12. 874
  13. 652
  14. 964
  15. 474
  16. 710
  17. 985
  18. 787
  19. 997
  20. 422
  21. 938
  22. 189
  23. 902
  24. 444
  25. 184
  26. 305
  27. 124
  28. 348
  29. 988
  30. 926
  31. 216
  32. 110
  33. 31
  34. 51
  35. 613
  36. 23
  37. 244
  38. 771
  39. 137
  40. 684

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