We look at the division of 215296 by 15 
The aim is to understand the frequency of 15 in 215296.

Advancing to step 1:
15 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 15

Advancing to step 2:
The number 15 fits into 21 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 6 after subtracting 15 from 21.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 15

Advancing to step 3:
When dividing 65 by 15, we get 4 with a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 14.0
If we take 60 away from 65, we end up with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 15

Let's proceed to step 4:
When dividing 52 by 15, we get 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 143.0
If we take 45 away from 52, we end up with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 15

Going ahead to step 5:
79 divided by 15 is 5 with a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 1435.0
Subtracting 75 from 79 leaves us with 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 15

Going ahead to step 6:
15 goes into 46 3 times with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 14353.0
The remainder is 1 after subtracting 45 from 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
When dividing 10 by 15, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 14353.0
Subtract 0 from 10 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.

Let's proceed to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
Write down 6 as next digit of the result. 
Result so far: 14353.06
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.

Going ahead to step 9:
100 divided by 15 is 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 14353.066
The remainder is 10 after subtracting 90 from 100.
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 result is 14353.066 with a remainder of 0.001.