We look at the division of 851391 by 5 
The aim is to understand the frequency of 5 in 851391.

Advancing to step 1:
5 can be fit into 8 1 times, resulting in a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 5 away from 8, we end up with 3.
Append the next digit (5) from the dividend to 3 and continue with: 35 / 5

Advancing to step 2:
If we divide 35 by 5, we get 7 and a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 17.0
Deduct 35 from 35 and we're left with 0.
Append the next digit (1) from the dividend to 0 and continue with: 1 / 5

On to step 3:
1 divided by 5 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 170.0
Subtract 0 from 1 to get 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 5

Moving on to step 4:
If we divide 13 by 5, we get 2 and a remainder of 3.
Write down 2 as next digit of the result. 
Result so far: 1702.0
If we subtract 10 from 13, we get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 5

Let's proceed to step 5:
5 goes into 39 7 times with a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 17027.0
Subtracting 35 from 39 leaves us with 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 5

Moving on to step 6:
The number 5 fits into 41 8 times, leaving a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 170278.0
Subtract 40 from 41 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
5 can be fit into 10 2 times, resulting in a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 170278.2
Subtract 10 from 10 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.

Let's proceed to step 8:
When dividing 0 by 5, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 170278.2
Deduct 0 from 0 and we're left 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.

Moving on to step 9:
The number 5 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 170278.2
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.

In conclusion, the division gives 170278.2 with a balance of 0.0.