2115577 ÷ 81 
The aim is to understand the frequency of 81 in 2115577.

Let's proceed to step 1:
2 divided by 81 is 0 with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 81

Advancing to step 2:
The number 81 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 81

On to step 3:
81 goes into 211 2 times with a remainder of 49.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 49 after subtracting 162 from 211.
Take the next digit (5) from the dividend and append it to 49, then repeat: 495 / 81

On to step 4:
81 can be fit into 495 6 times, resulting in a remainder of 9.
Use 6 as the next digit of our solution. 
Result so far: 26.0
If we take 486 away from 495, we end up with 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 81

On to step 5:
The number 81 fits into 95 1 times, leaving a remainder of 14.
Use 1 as the next digit of our solution. 
Result so far: 261.0
The remainder is 14 after subtracting 81 from 95.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 81

Let's proceed to step 6:
The number 81 fits into 147 1 times, leaving a remainder of 66.
The number 1 becomes the next digit in our result. 
Result so far: 2611.0
Deduct 81 from 147 and we're left with 66.
Bring next digit (7) of the dividend behind the 66 and repeat the process: 667 / 81

Let's proceed to step 7:
When dividing 667 by 81, we get 8 with a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 26118.0
If we take 648 away from 667, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 8:
When dividing 190 by 81, we get 2 with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 26118.2
The remainder is 28 after subtracting 162 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
81 goes into 280 3 times with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 26118.23
If we subtract 243 from 280, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 10:
If we divide 370 by 81, we get 4 and a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 26118.234
Deduct 324 from 370 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 11:
460 divided by 81 is 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 26118.2345
If we subtract 405 from 460, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 12:
The number 81 fits into 550 6 times, leaving a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 26118.23456
Subtract 486 from 550 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 13:
640 divided by 81 is 7 with a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 26118.234567
If we take 567 away from 640, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 14:
If we divide 730 by 81, we get 9 and a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 26118.2345679
The remainder is 1 after subtracting 729 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 15:
81 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 26118.2345679
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 26118.2345679 with a remainder of 1e-08.