We look at the division of 216132 by 15 
The aim is to understand the frequency of 15 in 216132.

On to step 1:
15 can be fit into 2 0 times, resulting in a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 15

Going ahead to step 2:
When dividing 21 by 15, we get 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 15 from 21 and we're left with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 15

Let's proceed to step 3:
When dividing 66 by 15, we get 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 14.0
Subtracting 60 from 66 leaves us with 6.
Grab the next digit (1) from the dividend, add it to 6, then carry on: 61 / 15

Advancing to step 4:
61 divided by 15 is 4 with a remainder of 1.
Use 4 as the next digit of our solution. 
Result so far: 144.0
If we take 60 away from 61, we end up with 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 15

Step 5:
15 goes into 13 0 times with a remainder of 13.
Write down 0 as next digit of the result. 
Result so far: 1440.0
Subtracting 0 from 13 leaves us with 13.
Grab the next digit (2) from the dividend, add it to 13, then carry on: 132 / 15

Let's proceed to step 6:
132 divided by 15 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 14408.0
The remainder is 12 after subtracting 120 from 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
If we divide 120 by 15, we get 8 and a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 14408.8
Subtracting 120 from 120 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 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 14408.8
If we take 0 away from 0, 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.

Let's proceed to step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 14408.8
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.

The final outcome is 14408.8, with a leftover of 0.0.