30509 ÷ 8 = 3813 R5
Let's divide 30509 by 8.

Step 1:
8 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 3 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 8

Step 2:
8 goes into 30 3 times with a remainder of 6.
Write down 3 as next digit of of the result. 
Result so far: 3
Subtract 24 from 30 to get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 8

Step 3:
8 goes into 65 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 38
Subtract 64 from 65 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 8

Step 4:
8 goes into 10 1 times with a remainder of 2.
Write down 1 as next digit of of the result. 
Result so far: 381
Subtract 8 from 10 to get 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 8

Step 5:
8 goes into 29 3 times with a remainder of 5.
Write down 3 as next digit of of the result. 
Result so far: 3813
Subtract 24 from 29 to get 5.

The final result is 3813 with a remainder of 5.