91509 ÷ 8 = 11438 R5
We're going to perform division on 91509 with 8 as the divisor.

Step 1:
8 goes into 9 1 times with a remainder of 1.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 8 from 9 to get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 8

Step 2:
8 goes into 11 1 times with a remainder of 3.
Write down 1 as next digit of of the result. 
Result so far: 11
Subtract 8 from 11 to get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 8

Step 3:
8 goes into 35 4 times with a remainder of 3.
Write down 4 as next digit of of the result. 
Result so far: 114
Subtract 32 from 35 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: 1143
Subtract 24 from 30 to get 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 8

Step 5:
8 goes into 69 8 times with a remainder of 5.
Write down 8 as next digit of of the result. 
Result so far: 11438
Subtract 64 from 69 to get 5.

The final result is 11438 with a remainder of 5.