63910 divided by 15 
The aim is to understand the frequency of 15 in 63910.

On to step 1:
If we divide 6 by 15, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 15

Let's proceed to step 2:
If we divide 63 by 15, we get 4 and a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we subtract 60 from 63, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 15

Step 3:
The number 15 fits into 39 2 times, leaving a remainder of 9.
Put 2 as the next digit of the answer. 
Result so far: 42.0
If we subtract 30 from 39, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 15

Let's proceed to step 4:
91 divided by 15 is 6 with a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 426.0
The remainder is 1 after subtracting 90 from 91.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 15

Going ahead to step 5:
If we divide 10 by 15, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 4260.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 6:
If we divide 100 by 15, we get 6 and a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 4260.6
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
100 divided by 15 is 6 with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 4260.66
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 4260.66 with a remaining 0.01.