We look at the division of 315624 by 15 
The aim is to understand the frequency of 15 in 315624.

On to step 1:
The number 15 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 15

Moving on to step 2:
The number 15 fits into 31 2 times, leaving a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtract 30 from 31 to get 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 15

Step 3:
15 can be fit into 15 1 times, resulting in a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
Subtracting 15 from 15 leaves us with 0.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 15

Let's proceed to step 4:
15 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 210.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (2) from the dividend and append it to 6, then repeat: 62 / 15

On to step 5:
If we divide 62 by 15, we get 4 and a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 2104.0
Deduct 60 from 62 and we're left with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 15

Going ahead to step 6:
24 divided by 15 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 21041.0
Subtracting 15 from 24 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
15 goes into 90 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 21041.6
Deduct 90 from 90 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.

Step 8:
If we divide 0 by 15, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 21041.6
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.

On to step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 21041.6
Subtract 0 from 0 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.

In conclusion, the division gives 21041.6 with a balance of 0.0.