82020 divided by 81 
The aim is to understand the frequency of 81 in 82020.

On to step 1:
8 divided by 81 is 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 81

Step 2:
When dividing 82 by 81, we get 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 81 from 82 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 81

On to step 3:
81 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 10, we get 10.
Include the next digit (2) from the dividend after 10, then repeat: 102 / 81

Let's proceed to step 4:
81 can be fit into 102 1 times, resulting in a remainder of 21.
Write down 1 as next digit of the result. 
Result so far: 101.0
If we subtract 81 from 102, we get 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 81

Let's proceed to step 5:
The number 81 fits into 210 2 times, leaving a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 1012.0
If we take 162 away from 210, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 6:
81 can be fit into 480 5 times, resulting in a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 1012.5
Subtract 405 from 480 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 7:
The number 81 fits into 750 9 times, leaving a remainder of 21.
The next digit of our result is 9. 
Result so far: 1012.59
Subtracting 729 from 750 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 8:
81 can be fit into 210 2 times, resulting in a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 1012.592
The remainder is 48 after subtracting 162 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 9:
When dividing 480 by 81, we get 5 with a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 1012.5925
Deduct 405 from 480 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 10:
When dividing 750 by 81, we get 9 with a remainder of 21.
The number 9 becomes the next digit in our result. 
Result so far: 1012.59259
If we subtract 729 from 750, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 11:
When dividing 210 by 81, we get 2 with a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 1012.592592
If we take 162 away from 210, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 12:
81 goes into 480 5 times with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 1012.5925925
Subtracting 405 from 480 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 13:
When dividing 750 by 81, we get 9 with a remainder of 21.
The number 9 becomes the next digit in our result. 
Result so far: 1012.59259259
If we subtract 729 from 750, we get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Our division results in 1012.59259259 with a remaining 2.1e-08.