12305 ÷ 8 = 1538 R1
We're going to perform division on 12305 with 8 as the divisor.

Step 1:
8 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 1 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 8

Step 2:
8 goes into 12 1 times with a remainder of 4.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 8 from 12 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 8

Step 3:
8 goes into 43 5 times with a remainder of 3.
Write down 5 as next digit of of the result. 
Result so far: 15
Subtract 40 from 43 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 8

Step 4:
8 goes into 30 3 times with a remainder of 6.
Write down 3 as next digit of of the result. 
Result so far: 153
Subtract 24 from 30 to get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 8

Step 5:
8 goes into 65 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 1538
Subtract 64 from 65 to get 1.

The final result is 1538 with a remainder of 1.