We look at the division of 317261 by 81 
The aim is to understand the frequency of 81 in 317261.

Going ahead to step 1:
If we divide 3 by 81, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (1) from the dividend to 3 and continue with: 31 / 81

Advancing to step 2:
The number 81 fits into 31 0 times, leaving a remainder of 31.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 31, we get 31.
Grab the next digit (7) from the dividend, add it to 31, then carry on: 317 / 81

Going ahead to step 3:
If we divide 317 by 81, we get 3 and a remainder of 74.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 243 from 317 to get 74.
Take the next digit (2) from the dividend and append it to 74, then repeat: 742 / 81

Let's proceed to step 4:
The number 81 fits into 742 9 times, leaving a remainder of 13.
Write down 9 as next digit of the result. 
Result so far: 39.0
Deduct 729 from 742 and we're left with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 81

On to step 5:
81 can be fit into 136 1 times, resulting in a remainder of 55.
Put 1 as the next digit of the answer. 
Result so far: 391.0
Subtracting 81 from 136 leaves us with 55.
Bring next digit (1) of the dividend behind the 55 and repeat the process: 551 / 81

Step 6:
81 goes into 551 6 times with a remainder of 65.
Record the quotient 6 as the next digit in the result. 
Result so far: 3916.0
The remainder is 65 after subtracting 486 from 551.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 7:
81 goes into 650 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 3916.8
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.

Advancing to step 8:
81 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 3916.8
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.

Moving on to step 9:
When dividing 200 by 81, we get 2 with a remainder of 38.
Put 2 as the next digit of the answer. 
Result so far: 3916.802
The remainder is 38 after subtracting 162 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 10:
380 divided by 81 is 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 3916.8024
Deduct 324 from 380 and we're left 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.

Going ahead to step 11:
The number 81 fits into 560 6 times, leaving a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 3916.80246
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.

Step 12:
If we divide 740 by 81, we get 9 and a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 3916.802469
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 13:
If we divide 110 by 81, we get 1 and a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 3916.8024691
Subtracting 81 from 110 leaves us 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.

On to step 14:
If we divide 290 by 81, we get 3 and a remainder of 47.
Put 3 as the next digit of the answer. 
Result so far: 3916.80246913
Subtract 243 from 290 to get 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 outcome is 3916.80246913, with a leftover of 4.7e-08.