81775 ÷ 15 
The aim is to understand the frequency of 15 in 81775.

Step 1:
When dividing 8 by 15, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 15

Going ahead to step 2:
When dividing 81 by 15, we get 5 with a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 75 away from 81, we end up with 6.
Include the next digit (7) from the dividend after 6, then repeat: 67 / 15

Step 3:
15 can be fit into 67 4 times, resulting in a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 54.0
If we subtract 60 from 67, we get 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 15

Let's proceed to step 4:
77 divided by 15 is 5 with a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 545.0
Deduct 75 from 77 and we're left with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 15

On to step 5:
15 can be fit into 25 1 times, resulting in a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 5451.0
Subtract 15 from 25 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.

On to step 6:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 5451.6
If we take 90 away from 100, we end up 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.

Advancing to step 7:
If we divide 100 by 15, we get 6 and a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 5451.66
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.

The final result is 5451.66 with a remainder of 0.01.