We divide 304960 by 15
The aim is to understand the frequency of 15 in 304960.

Step 1:
3 divided by 15 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (0) from the dividend and append it to 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
Deduct 30 from 30 and we're left with 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 15

On to step 3:
15 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 20.0
Subtract 0 from 4 to get 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 15

Moving on to step 4:
If we divide 49 by 15, we get 3 and a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 203.0
Deduct 45 from 49 and we're left with 4.
Fetch the next digit (6) from the dividend, attach it to 4 and continue: 46 / 15

On to step 5:
If we divide 46 by 15, we get 3 and a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 2033.0
Deduct 45 from 46 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 15

Step 6:
10 divided by 15 is 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 20330.0
Deduct 0 from 10 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.

Going ahead to step 7:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 20330.6
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
15 goes into 100 6 times with a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 20330.66
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 20330.66, with a leftover of 0.01.