We look at the division of 68105 by 81 
The aim is to understand the frequency of 81 in 68105.

On to step 1:
6 divided by 81 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 81

Step 2:
81 goes into 68 0 times with a remainder of 68.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 68 leaves us with 68.
Take the next digit (1) from the dividend and append it to 68, then repeat: 681 / 81

Step 3:
81 goes into 681 8 times with a remainder of 33.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 33 after subtracting 648 from 681.
Fetch the next digit (0) from the dividend, attach it to 33 and continue: 330 / 81

Advancing to step 4:
If we divide 330 by 81, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 84.0
Subtract 324 from 330 to get 6.
Take the next digit (5) from the dividend and append it to 6, then repeat: 65 / 81

Moving on to step 5:
81 goes into 65 0 times with a remainder of 65.
The number 0 becomes the next digit in our result. 
Result so far: 840.0
If we take 0 away from 65, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Going ahead to step 6:
81 goes into 650 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 840.8
Deduct 648 from 650 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 7:
20 divided by 81 is 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 840.8
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
The number 81 fits into 200 2 times, leaving a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 840.802
If we subtract 162 from 200, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 9:
If we divide 380 by 81, we get 4 and a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 840.8024
If we take 324 away from 380, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 10:
81 can be fit into 560 6 times, resulting in a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 840.80246
Deduct 486 from 560 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 11:
81 can be fit into 740 9 times, resulting in a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 840.802469
Subtracting 729 from 740 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 12:
If we divide 110 by 81, we get 1 and a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 840.8024691
If we take 81 away from 110, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 13:
The number 81 fits into 290 3 times, leaving a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 840.80246913
If we take 243 away from 290, we end up with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

The final result is 840.80246913 with a remainder of 4.7e-08.