305544 ÷ 15 
The aim is to understand the frequency of 15 in 305544.

Step 1:
When dividing 3 by 15, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 15

Let's proceed to step 2:
15 can be fit into 30 2 times, resulting in a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 30 from 30 leaves us with 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 15

Moving on to step 3:
15 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 20.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 15

Advancing to step 4:
When dividing 55 by 15, we get 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 203.0
The remainder is 10 after subtracting 45 from 55.
Bring next digit (4) of the dividend behind the 10 and repeat the process: 104 / 15

Moving on to step 5:
15 goes into 104 6 times with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 2036.0
If we take 90 away from 104, we end up with 14.
Include the next digit (4) from the dividend after 14, then repeat: 144 / 15

Moving on to step 6:
The number 15 fits into 144 9 times, leaving a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 20369.0
Subtracting 135 from 144 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 7:
90 divided by 15 is 6 with a remainder of 0.
Write down 6 as next digit of the result. 
Result so far: 20369.6
If we subtract 90 from 90, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20369.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 20369.6
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 20369.6 with a balance of 0.0.