840 : 5

1. Divide 8 by 5, which is 1 with a remainder of 3.
2. Bring down the 4 to make 34.
3. Divide 34 by 5, which is 6 with a remainder of 4.
4. Bring down the 0 to make 40.
5. Divide 40 by 5, which is 8.
Result: 168