99115 ÷ 8 = 12389 R3
Alright, let's work through the division of 99115 by 8 step by step.

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 (9) of the dividend behind the 1 and repeat the process: 19 / 8

Step 2:
8 goes into 19 2 times with a remainder of 3.
Write down 2 as next digit of of the result. 
Result so far: 12
Subtract 16 from 19 to get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 8

Step 3:
8 goes into 31 3 times with a remainder of 7.
Write down 3 as next digit of of the result. 
Result so far: 123
Subtract 24 from 31 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 8

Step 4:
8 goes into 71 8 times with a remainder of 7.
Write down 8 as next digit of of the result. 
Result so far: 1238
Subtract 64 from 71 to get 7.
Bring next digit (5) of the dividend behind the 7 and repeat the process: 75 / 8

Step 5:
8 goes into 75 9 times with a remainder of 3.
Write down 9 as next digit of of the result. 
Result so far: 12389
Subtract 72 from 75 to get 3.

The final result is 12389 with a remainder of 3.