309982 ÷ 15 
The aim is to understand the frequency of 15 in 309982.

Advancing to step 1:
3 divided by 15 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 15

On to step 2:
30 divided by 15 is 2 with a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 30 from 30 and we're left with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 15

On to step 3:
If we divide 9 by 15, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 20.0
If we take 0 away from 9, we end up with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 15

On to step 4:
99 divided by 15 is 6 with a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 206.0
The remainder is 9 after subtracting 90 from 99.
Include the next digit (8) from the dividend after 9, then repeat: 98 / 15

Moving on to step 5:
When dividing 98 by 15, we get 6 with a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 2066.0
Subtracting 90 from 98 leaves us with 8.
Bring next digit (2) of the dividend behind the 8 and repeat the process: 82 / 15

Let's proceed to step 6:
82 divided by 15 is 5 with a remainder of 7.
Record the quotient 5 as the next digit in the result. 
Result so far: 20665.0
The remainder is 7 after subtracting 75 from 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Let's proceed to step 7:
The number 15 fits into 70 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 20665.4
If we take 60 away from 70, we end up 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.

Advancing to step 8:
15 goes into 100 6 times with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 20665.46
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.

On to step 9:
The number 15 fits into 100 6 times, leaving a remainder of 10.
The next digit of our result is 6. 
Result so far: 20665.466
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.

The final outcome is 20665.466, with a leftover of 0.001.