We're dividing 287122 by 81 
The aim is to understand the frequency of 81 in 287122.

Moving on to step 1:
When dividing 2 by 81, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 81

On to step 2:
28 divided by 81 is 0 with a remainder of 28.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Fetch the next digit (7) from the dividend, attach it to 28 and continue: 287 / 81

Let's proceed to step 3:
81 can be fit into 287 3 times, resulting in a remainder of 44.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 44 after subtracting 243 from 287.
Grab the next digit (1) from the dividend, add it to 44, then carry on: 441 / 81

Let's proceed to step 4:
If we divide 441 by 81, we get 5 and a remainder of 36.
Use 5 as the next digit of our solution. 
Result so far: 35.0
If we take 405 away from 441, we end up with 36.
Include the next digit (2) from the dividend after 36, then repeat: 362 / 81

Moving on to step 5:
81 can be fit into 362 4 times, resulting in a remainder of 38.
The number 4 becomes the next digit in our result. 
Result so far: 354.0
Deduct 324 from 362 and we're left with 38.
Fetch the next digit (2) from the dividend, attach it to 38 and continue: 382 / 81

Step 6:
If we divide 382 by 81, we get 4 and a remainder of 58.
Record the quotient 4 as the next digit in the result. 
Result so far: 3544.0
If we take 324 away from 382, 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.

Step 7:
81 goes into 580 7 times with a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 3544.7
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.

Let's proceed to step 8:
When dividing 130 by 81, we get 1 with a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 3544.71
Deduct 81 from 130 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 9:
81 can be fit into 490 6 times, resulting in a remainder of 4.
The next digit of our result is 6. 
Result so far: 3544.716
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.

Going ahead to step 10:
When dividing 40 by 81, we get 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 3544.716
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 11:
81 can be fit into 400 4 times, resulting in a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 3544.71604
Subtracting 324 from 400 leaves us 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.

Going ahead to step 12:
If we divide 760 by 81, we get 9 and a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 3544.716049
The remainder is 31 after subtracting 729 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 13:
The number 81 fits into 310 3 times, leaving a remainder of 67.
Record the quotient 3 as the next digit in the result. 
Result so far: 3544.7160493
Subtract 243 from 310 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Advancing 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: 3544.71604938
The remainder is 22 after subtracting 648 from 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Our division results in 3544.71604938 with a remaining 2.2e-08.