We look at the division of 307626 by 81 
The aim is to understand the frequency of 81 in 307626.

Going ahead to step 1:
The number 81 fits into 3 0 times, leaving a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 81

Let's proceed to step 2:
The number 81 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 30 leaves us with 30.
Fetch the next digit (7) from the dividend, attach it to 30 and continue: 307 / 81

Moving on to step 3:
The number 81 fits into 307 3 times, leaving a remainder of 64.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 243 from 307 to get 64.
Include the next digit (6) from the dividend after 64, then repeat: 646 / 81

On to step 4:
81 goes into 646 7 times with a remainder of 79.
The next digit of our result is 7. 
Result so far: 37.0
The remainder is 79 after subtracting 567 from 646.
Grab the next digit (2) from the dividend, add it to 79, then carry on: 792 / 81

Advancing to step 5:
81 goes into 792 9 times with a remainder of 63.
Use 9 as the next digit of our solution. 
Result so far: 379.0
Subtracting 729 from 792 leaves us with 63.
Fetch the next digit (6) from the dividend, attach it to 63 and continue: 636 / 81

Advancing to step 6:
81 goes into 636 7 times with a remainder of 69.
Use 7 as the next digit of our solution. 
Result so far: 3797.0
Deduct 567 from 636 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 7:
The number 81 fits into 690 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 3797.8
Subtracting 648 from 690 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 8:
The number 81 fits into 420 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 3797.85
Deduct 405 from 420 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 9:
81 goes into 150 1 times with a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 3797.851
If we take 81 away from 150, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 10:
The number 81 fits into 690 8 times, leaving a remainder of 42.
The next digit of our result is 8. 
Result so far: 3797.8518
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 11:
When dividing 420 by 81, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 3797.85185
Subtracting 405 from 420 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 12:
150 divided by 81 is 1 with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 3797.851851
Deduct 81 from 150 and we're left with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 13:
690 divided by 81 is 8 with a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 3797.8518518
Subtract 648 from 690 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 14:
81 goes into 420 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 3797.85185185
If we take 405 away from 420, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final outcome is 3797.85185185, with a leftover of 1.5e-08.