We look at the division of 723255 by 39 
The aim is to understand the frequency of 39 in 723255.

Going ahead to step 1:
If we divide 7 by 39, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 39

Moving on to step 2:
If we divide 72 by 39, we get 1 and a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 39 from 72, we get 33.
Include the next digit (3) from the dividend after 33, then repeat: 333 / 39

Going ahead to step 3:
The number 39 fits into 333 8 times, leaving a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we subtract 312 from 333, we get 21.
Append the next digit (2) from the dividend to 21 and continue with: 212 / 39

On to step 4:
39 can be fit into 212 5 times, resulting in a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 185.0
Subtract 195 from 212 to get 17.
Fetch the next digit (5) from the dividend, attach it to 17 and continue: 175 / 39

Moving on to step 5:
The number 39 fits into 175 4 times, leaving a remainder of 19.
Put 4 as the next digit of the answer. 
Result so far: 1854.0
If we take 156 away from 175, we end up with 19.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 39

On to step 6:
If we divide 195 by 39, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 18545.0
If we subtract 195 from 195, 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.

Advancing to step 7:
When dividing 0 by 39, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 18545.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
The number 39 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 18545.0
If we take 0 away from 0, we end up 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.

After the division, we end up with 18545.0 and a remainder of 0.0.