91258 ÷ 8 = 11407 R2
We're going to perform division on 91258 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 (2) of the dividend behind the 3 and repeat the process: 32 / 8

Step 3:
8 goes into 32 4 times with a remainder of 0.
Write down 4 as next digit of of the result. 
Result so far: 114
Subtract 32 from 32 to get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 8

Step 4:
8 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 1140
Subtract 0 from 5 to get 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 8

Step 5:
8 goes into 58 7 times with a remainder of 2.
Write down 7 as next digit of of the result. 
Result so far: 11407
Subtract 56 from 58 to get 2.

The final result is 11407 with a remainder of 2.