We look at the division of 85396 by 81 
The aim is to understand the frequency of 81 in 85396.

Step 1:
81 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 81

Advancing to step 2:
The number 81 fits into 85 1 times, leaving a remainder of 4.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 81 from 85 leaves us with 4.
Append the next digit (3) from the dividend to 4 and continue with: 43 / 81

Moving on to step 3:
81 goes into 43 0 times with a remainder of 43.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 43 leaves us with 43.
Fetch the next digit (9) from the dividend, attach it to 43 and continue: 439 / 81

Advancing to step 4:
81 goes into 439 5 times with a remainder of 34.
Put 5 as the next digit of the answer. 
Result so far: 105.0
The remainder is 34 after subtracting 405 from 439.
Grab the next digit (6) from the dividend, add it to 34, then carry on: 346 / 81

Going ahead to step 5:
81 can be fit into 346 4 times, resulting in a remainder of 22.
Use 4 as the next digit of our solution. 
Result so far: 1054.0
Deduct 324 from 346 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 6:
220 divided by 81 is 2 with a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 1054.2
If we subtract 162 from 220, we get 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 can be fit into 580 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 1054.27
If we take 567 away from 580, we end up 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.

Going ahead to step 8:
If we divide 130 by 81, we get 1 and a remainder of 49.
The next digit of our result is 1. 
Result so far: 1054.271
Subtracting 81 from 130 leaves us 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.

Going ahead to step 9:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 1054.2716
If we take 486 away from 490, we end up 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.

Moving on to step 10:
If we divide 40 by 81, we get 0 and a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 1054.2716
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.

Step 11:
The number 81 fits into 400 4 times, leaving a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 1054.271604
Subtract 324 from 400 to get 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:
81 goes into 760 9 times with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 1054.2716049
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.

Going ahead to step 13:
81 can be fit into 310 3 times, resulting in a remainder of 67.
The number 3 becomes the next digit in our result. 
Result so far: 1054.27160493
The remainder is 67 after subtracting 243 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

The quotient of the division is 1054.27160493, and the remainder is 6.7e-08.