We're dividing 665612 by 15 
The aim is to understand the frequency of 15 in 665612.

Step 1:
15 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 15

Let's proceed to step 2:
15 goes into 66 4 times with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 60 from 66 and we're left with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 15

On to step 3:
If we divide 65 by 15, we get 4 and a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 44.0
Subtracting 60 from 65 leaves us with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 15

Advancing to step 4:
The number 15 fits into 56 3 times, leaving a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 443.0
The remainder is 11 after subtracting 45 from 56.
Fetch the next digit (1) from the dividend, attach it to 11 and continue: 111 / 15

Going ahead to step 5:
111 divided by 15 is 7 with a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 4437.0
Subtract 105 from 111 to get 6.
Bring next digit (2) of the dividend behind the 6 and repeat the process: 62 / 15

Advancing to step 6:
The number 15 fits into 62 4 times, leaving a remainder of 2.
Put 4 as the next digit of the answer. 
Result so far: 44374.0
The remainder is 2 after subtracting 60 from 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Moving on to step 7:
15 can be fit into 20 1 times, resulting in a remainder of 5.
The next digit of our result is 1. 
Result so far: 44374.1
Deduct 15 from 20 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.

On to step 8:
50 divided by 15 is 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 44374.13
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.

Let's proceed to step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 44374.133
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.

In conclusion, the division gives 44374.133 with a balance of 0.0005.