We're dividing 11752813 by 81 
The aim is to understand the frequency of 81 in 11752813.

Advancing to step 1:
1 divided by 81 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 81

On to step 2:
If we divide 11 by 81, we get 0 and a remainder of 11.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 11 and we're left with 11.
Grab the next digit (7) from the dividend, add it to 11, then carry on: 117 / 81

Let's proceed to step 3:
81 can be fit into 117 1 times, resulting in a remainder of 36.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 36 after subtracting 81 from 117.
Bring next digit (5) of the dividend behind the 36 and repeat the process: 365 / 81

On to step 4:
81 goes into 365 4 times with a remainder of 41.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Deduct 324 from 365 and we're left with 41.
Include the next digit (2) from the dividend after 41, then repeat: 412 / 81

Moving on to step 5:
412 divided by 81 is 5 with a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 145.0
Subtracting 405 from 412 leaves us with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 81

Going ahead to step 6:
The number 81 fits into 78 0 times, leaving a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 1450.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (1) from the dividend to 78 and continue with: 781 / 81

Advancing to step 7:
When dividing 781 by 81, we get 9 with a remainder of 52.
The next digit of our result is 9. 
Result so far: 14509.0
If we take 729 away from 781, we end up with 52.
Bring next digit (3) of the dividend behind the 52 and repeat the process: 523 / 81

Step 8:
If we divide 523 by 81, we get 6 and a remainder of 37.
The next digit of our result is 6. 
Result so far: 145096.0
Subtract 486 from 523 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 9:
81 can be fit into 370 4 times, resulting in a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 145096.4
Deduct 324 from 370 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 10:
81 can be fit into 460 5 times, resulting in a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 145096.45
If we subtract 405 from 460, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 11:
The number 81 fits into 550 6 times, leaving a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 145096.456
The remainder is 64 after subtracting 486 from 550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 12:
81 goes into 640 7 times with a remainder of 73.
The next digit of our result is 7. 
Result so far: 145096.4567
Subtracting 567 from 640 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 13:
If we divide 730 by 81, we get 9 and a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 145096.45679
Subtract 729 from 730 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 14:
When dividing 10 by 81, we get 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 145096.45679
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 15:
81 can be fit into 100 1 times, resulting in a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 145096.4567901
The remainder is 19 after subtracting 81 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 16:
The number 81 fits into 190 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 145096.45679012
If we take 162 away from 190, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Our division results in 145096.45679012 with a remaining 2.8e-08.