We're dividing 312273 by 15 
The aim is to understand the frequency of 15 in 312273.

Step 1:
15 goes into 3 0 times with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (1) of the dividend behind the 3 and repeat the process: 31 / 15

Moving on to step 2:
If we divide 31 by 15, we get 2 and a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 30 away from 31, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 15

Moving on to step 3:
If we divide 12 by 15, we get 0 and a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 15

Let's proceed to step 4:
If we divide 122 by 15, we get 8 and a remainder of 2.
The number 8 becomes the next digit in our result. 
Result so far: 208.0
If we subtract 120 from 122, we get 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 15

Advancing to step 5:
15 can be fit into 27 1 times, resulting in a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 2081.0
Deduct 15 from 27 and we're left with 12.
Append the next digit (3) from the dividend to 12 and continue with: 123 / 15

Let's proceed to step 6:
15 can be fit into 123 8 times, resulting in a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 20818.0
The remainder is 3 after subtracting 120 from 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
30 divided by 15 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 20818.2
The remainder is 0 after subtracting 30 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
15 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20818.2
If we subtract 0 from 0, 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.

Advancing to step 9:
15 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20818.2
Subtract 0 from 0 to 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.

The final outcome is 20818.2, with a leftover of 0.0.