We look at the division of 309599 by 5 
The aim is to understand the frequency of 5 in 309599.

Step 1:
When dividing 3 by 5, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 5

On to step 2:
If we divide 30 by 5, we get 6 and a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 6.0
Subtract 30 from 30 to get 0.
Fetch the next digit (9) from the dividend, attach it to 0 and continue: 9 / 5

Moving on to step 3:
5 can be fit into 9 1 times, resulting in a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 61.0
If we take 5 away from 9, we end up with 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 5

On to step 4:
5 can be fit into 45 9 times, resulting in a remainder of 0.
Write down 9 as next digit of the result. 
Result so far: 619.0
Subtract 45 from 45 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 5

Let's proceed to step 5:
5 can be fit into 9 1 times, resulting in a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 6191.0
If we take 5 away from 9, we end up with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 5

Step 6:
When dividing 49 by 5, we get 9 with a remainder of 4.
The next digit of our result is 9. 
Result so far: 61919.0
If we take 45 away from 49, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
5 can be fit into 40 8 times, resulting in a remainder of 0.
Put 8 as the next digit of the answer. 
Result so far: 61919.8
Subtract 40 from 40 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
0 divided by 5 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 61919.8
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
5 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 61919.8
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 61919.8 and a remainder of 0.0.