We look at the division of 166888 by 15 
The aim is to understand the frequency of 15 in 166888.

Advancing to step 1:
1 divided by 15 is 0 with 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.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 15

Step 2:
15 can be fit into 16 1 times, resulting in a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 1 after subtracting 15 from 16.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 15

Let's proceed to step 3:
The number 15 fits into 16 1 times, leaving a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 11.0
Subtract 15 from 16 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 15

Let's proceed to step 4:
The number 15 fits into 18 1 times, leaving a remainder of 3.
Write down 1 as next digit of the result. 
Result so far: 111.0
If we take 15 away from 18, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 15

Step 5:
15 goes into 38 2 times with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 1112.0
Subtract 30 from 38 to get 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 15

Moving on to step 6:
15 can be fit into 88 5 times, resulting in a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 11125.0
Subtract 75 from 88 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
130 divided by 15 is 8 with a remainder of 10.
The next digit of our result is 8. 
Result so far: 11125.8
If we subtract 120 from 130, we 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.

Moving on to step 8:
15 goes into 100 6 times with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 11125.86
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
If we divide 100 by 15, we get 6 and a remainder of 10.
The next digit of our result is 6. 
Result so far: 11125.866
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 11125.866 with a balance of 0.001.