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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 920 · 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. 1.344 + ? = 545
  2. 2.A school has 254 children. 155 of them are girls. How many boys are there?
  3. 3.240 + 559 =
  4. 4.? + 709 = 949
  5. 5.? + 468 = 797
  6. 6.A school has 240 children. 152 of them are girls. How many boys are there?
  7. 7.390 + ? = 912
  8. 8.307 − 215 =
  9. 9.940 − 586 =
  10. 10.A school has 305 children. 139 of them are girls. How many boys are there?
  11. 11.? + 492 = 929
  12. 12.A train has 589 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  13. 13.152 + 614 =
  14. 14.805 + 119 =
  15. 15.A school has 301 children. 296 of them are girls. How many boys are there?
  16. 16.A school has 608 children. 298 of them are girls. How many boys are there?
  17. 17.A school has 269 children. 103 of them are girls. How many boys are there?
  18. 18.? − 317 = 14
  19. 19.? + 458 = 604
  20. 20.884 + 103 =
  21. 21.296 + 307 =
  22. 22.712 − ? = 48
  23. 23.A train has 179 people in the front coaches and 234 people in the back coaches. How many people are on the train?
  24. 24.A train has 811 people in the front coaches and 162 people in the back coaches. How many people are on the train?
  25. 25.817 − 309 =
  26. 26.535 − 121 =
  27. 27.519 + ? = 682
  28. 28.598 + 361 =
  29. 29.? + 447 = 580
  30. 30.A train has 212 people in the front coaches and 757 people in the back coaches. How many people are on the train?
  31. 31.? − 443 = 220
  32. 32.A school has 374 children. 135 of them are girls. How many boys are there?
  33. 33.A train has 692 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  34. 34.892 + 106 =
  35. 35.292 − 239 =
  36. 36.753 + 150 =
  37. 37.265 + 652 =
  38. 38.A school has 545 children. 175 of them are girls. How many boys are there?
  39. 39.938 − 562 =
  40. 40.120 + 817 =

Answer key

  1. 201
  2. 99
  3. 799
  4. 240
  5. 329
  6. 88
  7. 522
  8. 92
  9. 354
  10. 166
  11. 437
  12. 744
  13. 766
  14. 924
  15. 5
  16. 310
  17. 166
  18. 331
  19. 146
  20. 987
  21. 603
  22. 664
  23. 413
  24. 973
  25. 508
  26. 414
  27. 163
  28. 959
  29. 133
  30. 969
  31. 663
  32. 239
  33. 805
  34. 998
  35. 53
  36. 903
  37. 917
  38. 370
  39. 376
  40. 937

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