We're dividing 77340771 by 81 
The aim is to understand the frequency of 81 in 77340771.

Advancing to step 1:
81 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 81

Advancing to step 2:
77 divided by 81 is 0 with a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 77 and we're left with 77.
Fetch the next digit (3) from the dividend, attach it to 77 and continue: 773 / 81

Going ahead to step 3:
The number 81 fits into 773 9 times, leaving a remainder of 44.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
If we take 729 away from 773, we end up with 44.
Bring next digit (4) of the dividend behind the 44 and repeat the process: 444 / 81

Moving on to step 4:
The number 81 fits into 444 5 times, leaving a remainder of 39.
The number 5 becomes the next digit in our result. 
Result so far: 95.0
If we subtract 405 from 444, we get 39.
Grab the next digit (0) from the dividend, add it to 39, then carry on: 390 / 81

Step 5:
390 divided by 81 is 4 with a remainder of 66.
The next digit of our result is 4. 
Result so far: 954.0
If we take 324 away from 390, we end up with 66.
Take the next digit (7) from the dividend and append it to 66, then repeat: 667 / 81

Advancing to step 6:
667 divided by 81 is 8 with a remainder of 19.
Use 8 as the next digit of our solution. 
Result so far: 9548.0
If we take 648 away from 667, we end up with 19.
Take the next digit (7) from the dividend and append it to 19, then repeat: 197 / 81

Going ahead to step 7:
The number 81 fits into 197 2 times, leaving a remainder of 35.
Put 2 as the next digit of the answer. 
Result so far: 95482.0
If we subtract 162 from 197, we get 35.
Include the next digit (1) from the dividend after 35, then repeat: 351 / 81

Let's proceed to step 8:
81 goes into 351 4 times with a remainder of 27.
Record the quotient 4 as the next digit in the result. 
Result so far: 954824.0
If we subtract 324 from 351, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 9:
270 divided by 81 is 3 with a remainder of 27.
The next digit of our result is 3. 
Result so far: 954824.3
If we subtract 243 from 270, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 10:
81 goes into 270 3 times with a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 954824.33
Subtracting 243 from 270 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

After the division, we end up with 954824.33 and a remainder of 0.027.