We're dividing 798209 by 81 
The aim is to understand the frequency of 81 in 798209.

Step 1:
81 goes into 7 0 times with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (9) from the dividend and append it to 7, then repeat: 79 / 81

Moving on to step 2:
81 can be fit into 79 0 times, resulting in a remainder of 79.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 79 to get 79.
Fetch the next digit (8) from the dividend, attach it to 79 and continue: 798 / 81

Moving on to step 3:
If we divide 798 by 81, we get 9 and a remainder of 69.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we subtract 729 from 798, we get 69.
Include the next digit (2) from the dividend after 69, then repeat: 692 / 81

On to step 4:
692 divided by 81 is 8 with a remainder of 44.
Write down 8 as next digit of the result. 
Result so far: 98.0
Subtracting 648 from 692 leaves us with 44.
Append the next digit (0) from the dividend to 44 and continue with: 440 / 81

Advancing to step 5:
The number 81 fits into 440 5 times, leaving a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 985.0
If we subtract 405 from 440, we get 35.
Bring next digit (9) of the dividend behind the 35 and repeat the process: 359 / 81

On to step 6:
The number 81 fits into 359 4 times, leaving a remainder of 35.
The next digit of our result is 4. 
Result so far: 9854.0
If we subtract 324 from 359, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 7:
350 divided by 81 is 4 with a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 9854.4
Subtracting 324 from 350 leaves us with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 8:
The number 81 fits into 260 3 times, leaving a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 9854.43
If we subtract 243 from 260, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 9:
The number 81 fits into 170 2 times, leaving a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 9854.432
If we take 162 away from 170, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
80 divided by 81 is 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 9854.432
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 11:
81 can be fit into 800 9 times, resulting in a remainder of 71.
The next digit of our result is 9. 
Result so far: 9854.43209
Subtracting 729 from 800 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Going ahead to step 12:
If we divide 710 by 81, we get 8 and a remainder of 62.
The next digit of our result is 8. 
Result so far: 9854.432098
If we take 648 away from 710, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 13:
81 can be fit into 620 7 times, resulting in a remainder of 53.
Put 7 as the next digit of the answer. 
Result so far: 9854.4320987
If we take 567 away from 620, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Let's proceed to step 14:
81 goes into 530 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 9854.43209876
The remainder is 44 after subtracting 486 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The quotient of the division is 9854.43209876, and the remainder is 4.4e-08.