783655 divided by 15 
The aim is to understand the frequency of 15 in 783655.

Step 1:
15 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 15

Going ahead to step 2:
If we divide 78 by 15, we get 5 and a remainder of 3.
The next digit of our result is 5. 
Result so far: 5.0
If we take 75 away from 78, we end up with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 15

Step 3:
15 goes into 33 2 times with a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 52.0
If we take 30 away from 33, we end up with 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 15

Going ahead to step 4:
15 goes into 36 2 times with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 522.0
If we take 30 away from 36, we end up with 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 15

On to step 5:
65 divided by 15 is 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 5224.0
The remainder is 5 after subtracting 60 from 65.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 15

Let's proceed to step 6:
55 divided by 15 is 3 with a remainder of 10.
Write down 3 as next digit of the result. 
Result so far: 52243.0
The remainder is 10 after subtracting 45 from 55.
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:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 52243.6
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
The next digit of our result is 6. 
Result so far: 52243.66
Subtracting 90 from 100 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.

The final outcome is 52243.66, with a leftover of 0.01.