We look at the division of 156128 by 15 
The aim is to understand the frequency of 15 in 156128.

Step 1:
The number 15 fits into 1 0 times, leaving a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 15

Let's proceed to step 2:
If we divide 15 by 15, we get 1 and a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 0 after subtracting 15 from 15.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 15

Advancing to step 3:
15 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 6, we end up with 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 15

On to step 4:
15 can be fit into 61 4 times, resulting in a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 104.0
If we take 60 away from 61, we end up with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 15

Advancing to step 5:
15 goes into 12 0 times with a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 1040.0
Subtract 0 from 12 to get 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 15

Going ahead to step 6:
128 divided by 15 is 8 with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 10408.0
Subtracting 120 from 128 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 7:
15 can be fit into 80 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 10408.5
Subtracting 75 from 80 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 10408.53
Deduct 45 from 50 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
15 goes into 50 3 times with a remainder of 5.
Record the quotient 3 as the next digit in the result. 
Result so far: 10408.533
Subtract 45 from 50 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 10408.533, with a leftover of 0.0005.