We look at the division of 392220 by 15 
The aim is to understand the frequency of 15 in 392220.

Step 1:
15 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 15

Moving on to step 2:
When dividing 39 by 15, we get 2 with a remainder of 9.
Use 2 as the next digit of our solution. 
Result so far: 2.0
The remainder is 9 after subtracting 30 from 39.
Fetch the next digit (2) from the dividend, attach it to 9 and continue: 92 / 15

Going ahead to step 3:
92 divided by 15 is 6 with a remainder of 2.
The next digit of our result is 6. 
Result so far: 26.0
If we take 90 away from 92, we end up with 2.
Fetch the next digit (2) from the dividend, attach it to 2 and continue: 22 / 15

Advancing to step 4:
15 goes into 22 1 times with a remainder of 7.
The next digit of our result is 1. 
Result so far: 261.0
Subtract 15 from 22 to get 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 15

Step 5:
When dividing 72 by 15, we get 4 with a remainder of 12.
Record the quotient 4 as the next digit in the result. 
Result so far: 2614.0
If we take 60 away from 72, we end up with 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 15

Going ahead to step 6:
15 can be fit into 120 8 times, resulting in a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 26148.0
If we take 120 away from 120, we end up 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.

Advancing to step 7:
If we divide 0 by 15, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 26148.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 26148.0
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.

After the division, we end up with 26148.0 and a remainder of 0.0.