653729 divided by 15 
The aim is to understand the frequency of 15 in 653729.

On to step 1:
If we divide 6 by 15, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 15

Let's proceed to step 2:
If we divide 65 by 15, we get 4 and a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 60 from 65 leaves us with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 15

Moving on to step 3:
15 can be fit into 53 3 times, resulting in a remainder of 8.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
If we take 45 away from 53, we end up with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 15

Step 4:
When dividing 87 by 15, we get 5 with a remainder of 12.
Write down 5 as next digit of the result. 
Result so far: 435.0
The remainder is 12 after subtracting 75 from 87.
Grab the next digit (2) from the dividend, add it to 12, then carry on: 122 / 15

Moving on to step 5:
When dividing 122 by 15, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 4358.0
Subtract 120 from 122 to get 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 15

Moving on to step 6:
If we divide 29 by 15, we get 1 and a remainder of 14.
The number 1 becomes the next digit in our result. 
Result so far: 43581.0
If we subtract 15 from 29, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
15 can be fit into 140 9 times, resulting in a remainder of 5.
The next digit of our result is 9. 
Result so far: 43581.9
If we subtract 135 from 140, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
The next digit of our result is 3. 
Result so far: 43581.93
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
15 goes into 50 3 times with a remainder of 5.
The next digit of our result is 3. 
Result so far: 43581.933
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 43581.933, with a leftover of 0.0005.