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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 66 · 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.? − 936 = 20
  2. 2.973 − 897 =
  3. 3.499 − 101 =
  4. 4.A train has 680 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  5. 5.? + 240 = 398
  6. 6.973 − ? = 429
  7. 7.? + 205 = 765
  8. 8.264 − ? = 162
  9. 9.445 − ? = 315
  10. 10.378 + 608 =
  11. 11.214 + 751 =
  12. 12.? − 450 = 22
  13. 13.712 − ? = 380
  14. 14.153 + 731 =
  15. 15.868 − 202 =
  16. 16.649 + ? = 972
  17. 17.401 − 112 =
  18. 18.230 − 111 =
  19. 19.A train has 814 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  20. 20.243 − 111 =
  21. 21.362 − 139 =
  22. 22.968 − 491 =
  23. 23.A school has 257 children. 106 of them are girls. How many boys are there?
  24. 24.409 + 379 =
  25. 25.826 + ? = 957
  26. 26.A school has 223 children. 202 of them are girls. How many boys are there?
  27. 27.631 − ? = 490
  28. 28.? − 143 = 83
  29. 29.578 − ? = 248
  30. 30.A school has 538 children. 468 of them are girls. How many boys are there?
  31. 31.A train has 436 people in the front coaches and 353 people in the back coaches. How many people are on the train?
  32. 32.752 + ? = 912
  33. 33.A train has 302 people in the front coaches and 295 people in the back coaches. How many people are on the train?
  34. 34.? − 110 = 155
  35. 35.980 − ? = 613
  36. 36.415 + 224 =
  37. 37.A train has 154 people in the front coaches and 229 people in the back coaches. How many people are on the train?
  38. 38.A train has 825 people in the front coaches and 119 people in the back coaches. How many people are on the train?
  39. 39.592 + 156 =
  40. 40.A train has 482 people in the front coaches and 161 people in the back coaches. How many people are on the train?

Answer key

  1. 956
  2. 76
  3. 398
  4. 988
  5. 158
  6. 544
  7. 560
  8. 102
  9. 130
  10. 986
  11. 965
  12. 472
  13. 332
  14. 884
  15. 666
  16. 323
  17. 289
  18. 119
  19. 927
  20. 132
  21. 223
  22. 477
  23. 151
  24. 788
  25. 131
  26. 21
  27. 141
  28. 226
  29. 330
  30. 70
  31. 789
  32. 160
  33. 597
  34. 265
  35. 367
  36. 639
  37. 383
  38. 944
  39. 748
  40. 643

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