Let's divide 653788 by 15
The aim is to understand the frequency of 15 in 653788.

Step 1:
6 divided by 15 is 0 with 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.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 15

On to step 2:
The number 15 fits into 65 4 times, leaving a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 60 away from 65, we end up with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 15

Advancing to step 3:
53 divided by 15 is 3 with a remainder of 8.
The next digit of our result is 3. 
Result so far: 43.0
Subtracting 45 from 53 leaves us with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 15

On to step 4:
If we divide 87 by 15, we get 5 and a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 435.0
The remainder is 12 after subtracting 75 from 87.
Fetch the next digit (8) from the dividend, attach it to 12 and continue: 128 / 15

Moving on to step 5:
128 divided by 15 is 8 with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 4358.0
Subtract 120 from 128 to get 8.
Include the next digit (8) from the dividend after 8, then repeat: 88 / 15

Let's proceed to step 6:
The number 15 fits into 88 5 times, leaving a remainder of 13.
The next digit of our result is 5. 
Result so far: 43585.0
Deduct 75 from 88 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
15 goes into 130 8 times with a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 43585.8
Subtracting 120 from 130 leaves us 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.

Step 8:
If we divide 100 by 15, we get 6 and a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 43585.86
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.

Let's proceed to step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 43585.866
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.

The final outcome is 43585.866, with a leftover of 0.001.