We divide 90192 by 81
The aim is to understand the frequency of 81 in 90192.

Advancing to step 1:
When dividing 9 by 81, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 81

Let's proceed to step 2:
81 can be fit into 90 1 times, resulting in a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 81 from 90, we get 9.
Include the next digit (1) from the dividend after 9, then repeat: 91 / 81

Moving on to step 3:
91 divided by 81 is 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we take 81 away from 91, we end up with 10.
Fetch the next digit (9) from the dividend, attach it to 10 and continue: 109 / 81

Let's proceed to step 4:
The number 81 fits into 109 1 times, leaving a remainder of 28.
Write down 1 as next digit of the result. 
Result so far: 111.0
If we take 81 away from 109, we end up with 28.
Include the next digit (2) from the dividend after 28, then repeat: 282 / 81

Advancing to step 5:
81 goes into 282 3 times with a remainder of 39.
The number 3 becomes the next digit in our result. 
Result so far: 1113.0
If we take 243 away from 282, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 6:
81 goes into 390 4 times with a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 1113.4
Subtracting 324 from 390 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 7:
When dividing 660 by 81, we get 8 with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 1113.48
If we subtract 648 from 660, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 8:
When dividing 120 by 81, we get 1 with a remainder of 39.
The number 1 becomes the next digit in our result. 
Result so far: 1113.481
The remainder is 39 after subtracting 81 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 9:
390 divided by 81 is 4 with a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 1113.4814
The remainder is 66 after subtracting 324 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 10:
If we divide 660 by 81, we get 8 and a remainder of 12.
The next digit of our result is 8. 
Result so far: 1113.48148
If we subtract 648 from 660, we get 12.
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 11:
If we divide 120 by 81, we get 1 and a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 1113.481481
If we subtract 81 from 120, we get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Advancing to step 12:
The number 81 fits into 390 4 times, leaving a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 1113.4814814
The remainder is 66 after subtracting 324 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 13:
When dividing 660 by 81, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 1113.48148148
Deduct 648 from 660 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final outcome is 1113.48148148, with a leftover of 1.2e-08.