We're dividing 279751 by 81 
The aim is to understand the frequency of 81 in 279751.

Let's proceed to step 1:
If we divide 2 by 81, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 81

Let's proceed to step 2:
81 goes into 27 0 times with a remainder of 27.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 27 and we're left with 27.
Include the next digit (9) from the dividend after 27, then repeat: 279 / 81

Step 3:
If we divide 279 by 81, we get 3 and a remainder of 36.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtracting 243 from 279 leaves us with 36.
Take the next digit (7) from the dividend and append it to 36, then repeat: 367 / 81

Going ahead to step 4:
367 divided by 81 is 4 with a remainder of 43.
Record the quotient 4 as the next digit in the result. 
Result so far: 34.0
Deduct 324 from 367 and we're left with 43.
Include the next digit (5) from the dividend after 43, then repeat: 435 / 81

Going ahead to step 5:
435 divided by 81 is 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 345.0
Deduct 405 from 435 and we're left with 30.
Bring next digit (1) of the dividend behind the 30 and repeat the process: 301 / 81

Going ahead to step 6:
When dividing 301 by 81, we get 3 with a remainder of 58.
The number 3 becomes the next digit in our result. 
Result so far: 3453.0
If we take 243 away from 301, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
When dividing 580 by 81, we get 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 3453.7
Deduct 567 from 580 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 8:
81 goes into 130 1 times with a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 3453.71
Subtract 81 from 130 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 9:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 3453.716
Deduct 486 from 490 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 10:
If we divide 40 by 81, we get 0 and a remainder of 40.
The next digit of our result is 0. 
Result so far: 3453.716
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
81 can be fit into 400 4 times, resulting in a remainder of 76.
The next digit of our result is 4. 
Result so far: 3453.71604
If we take 324 away from 400, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 12:
When dividing 760 by 81, we get 9 with a remainder of 31.
The next digit of our result is 9. 
Result so far: 3453.716049
Deduct 729 from 760 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 13:
If we divide 310 by 81, we get 3 and a remainder of 67.
The number 3 becomes the next digit in our result. 
Result so far: 3453.7160493
If we take 243 away from 310, we end up with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 14:
When dividing 670 by 81, we get 8 with a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 3453.71604938
If we subtract 648 from 670, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final result is 3453.71604938 with a remainder of 2.2e-08.