We look at the division of 196545 by 81 
The aim is to understand the frequency of 81 in 196545.

On to step 1:
81 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 81

Going ahead to step 2:
When dividing 19 by 81, we get 0 with a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 19, we get 19.
Include the next digit (6) from the dividend after 19, then repeat: 196 / 81

Let's proceed to step 3:
When dividing 196 by 81, we get 2 with a remainder of 34.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtracting 162 from 196 leaves us with 34.
Include the next digit (5) from the dividend after 34, then repeat: 345 / 81

Going ahead to step 4:
81 can be fit into 345 4 times, resulting in a remainder of 21.
Write down 4 as next digit of the result. 
Result so far: 24.0
The remainder is 21 after subtracting 324 from 345.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 81

Going ahead to step 5:
214 divided by 81 is 2 with a remainder of 52.
Put 2 as the next digit of the answer. 
Result so far: 242.0
Subtract 162 from 214 to get 52.
Bring next digit (5) of the dividend behind the 52 and repeat the process: 525 / 81

Advancing to step 6:
525 divided by 81 is 6 with a remainder of 39.
Write down 6 as next digit of the result. 
Result so far: 2426.0
The remainder is 39 after subtracting 486 from 525.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Moving on to step 7:
If we divide 390 by 81, we get 4 and a remainder of 66.
The next digit of our result is 4. 
Result so far: 2426.4
Subtract 324 from 390 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Going ahead to step 8:
81 can be fit into 660 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 2426.48
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.

Going ahead to step 9:
81 can be fit into 120 1 times, resulting in a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 2426.481
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.

On to step 10:
The number 81 fits into 390 4 times, leaving a remainder of 66.
The next digit of our result is 4. 
Result so far: 2426.4814
Subtract 324 from 390 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Moving on to step 11:
660 divided by 81 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 2426.48148
Subtracting 648 from 660 leaves us 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.

Moving on to step 12:
If we divide 120 by 81, we get 1 and a remainder of 39.
The next digit of our result is 1. 
Result so far: 2426.481481
Subtracting 81 from 120 leaves us 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.

Moving on to step 13:
If we divide 390 by 81, we get 4 and a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 2426.4814814
If we subtract 324 from 390, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Moving on to step 14:
660 divided by 81 is 8 with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 2426.48148148
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.

The final result is 2426.48148148 with a remainder of 1.2e-08.