40158 ÷ 8 = 5019 R6
Alright, let's work through the division of 40158 by 8 step by step.

Step 1:
8 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 4 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 8

Step 2:
8 goes into 40 5 times with a remainder of 0.
Write down 5 as next digit of of the result. 
Result so far: 5
Subtract 40 from 40 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 8

Step 3:
8 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 50
Subtract 0 from 1 to get 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 8

Step 4:
8 goes into 15 1 times with a remainder of 7.
Write down 1 as next digit of of the result. 
Result so far: 501
Subtract 8 from 15 to get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 8

Step 5:
8 goes into 78 9 times with a remainder of 6.
Write down 9 as next digit of of the result. 
Result so far: 5019
Subtract 72 from 78 to get 6.

The final result is 5019 with a remainder of 6.