We look at the division of 89836 by 81 
The aim is to understand the frequency of 81 in 89836.

Let's proceed to step 1:
If we divide 8 by 81, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (9) from the dividend, add it to 8, then carry on: 89 / 81

Let's proceed to step 2:
81 can be fit into 89 1 times, resulting in a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 81 from 89 to get 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 81

Let's proceed to step 3:
88 divided by 81 is 1 with a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 11.0
Deduct 81 from 88 and we're left with 7.
Fetch the next digit (3) from the dividend, attach it to 7 and continue: 73 / 81

Moving on to step 4:
73 divided by 81 is 0 with a remainder of 73.
The number 0 becomes the next digit in our result. 
Result so far: 110.0
If we subtract 0 from 73, we get 73.
Fetch the next digit (6) from the dividend, attach it to 73 and continue: 736 / 81

Moving on to step 5:
If we divide 736 by 81, we get 9 and a remainder of 7.
The next digit of our result is 9. 
Result so far: 1109.0
The remainder is 7 after subtracting 729 from 736.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 6:
If we divide 70 by 81, we get 0 and a remainder of 70.
The next digit of our result is 0. 
Result so far: 1109.0
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Going ahead to step 7:
When dividing 700 by 81, we get 8 with a remainder of 52.
Write down 8 as next digit of the result. 
Result so far: 1109.08
If we take 648 away from 700, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 8:
If we divide 520 by 81, we get 6 and a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 1109.086
Subtract 486 from 520 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 9:
340 divided by 81 is 4 with a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 1109.0864
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 10:
The number 81 fits into 160 1 times, leaving a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 1109.08641
Subtract 81 from 160 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 11:
81 can be fit into 790 9 times, resulting in a remainder of 61.
The next digit of our result is 9. 
Result so far: 1109.086419
The remainder is 61 after subtracting 729 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 12:
If we divide 610 by 81, we get 7 and a remainder of 43.
The next digit of our result is 7. 
Result so far: 1109.0864197
Subtracting 567 from 610 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 13:
The number 81 fits into 430 5 times, leaving a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 1109.08641975
If we take 405 away from 430, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 1109.08641975 with a remainder of 2.5e-08.