Let's divide 564025 by 81
The aim is to understand the frequency of 81 in 564025.

Advancing to step 1:
When dividing 5 by 81, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 81

Going ahead to step 2:
If we divide 56 by 81, we get 0 and a remainder of 56.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 56, we get 56.
Fetch the next digit (4) from the dividend, attach it to 56 and continue: 564 / 81

On to step 3:
The number 81 fits into 564 6 times, leaving a remainder of 78.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 486 away from 564, we end up with 78.
Fetch the next digit (0) from the dividend, attach it to 78 and continue: 780 / 81

Let's proceed to step 4:
780 divided by 81 is 9 with a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 69.0
The remainder is 51 after subtracting 729 from 780.
Append the next digit (2) from the dividend to 51 and continue with: 512 / 81

Advancing to step 5:
81 can be fit into 512 6 times, resulting in a remainder of 26.
The next digit of our result is 6. 
Result so far: 696.0
If we subtract 486 from 512, we get 26.
Bring next digit (5) of the dividend behind the 26 and repeat the process: 265 / 81

Moving on to step 6:
81 goes into 265 3 times with a remainder of 22.
Write down 3 as next digit of the result. 
Result so far: 6963.0
The remainder is 22 after subtracting 243 from 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 7:
81 can be fit into 220 2 times, resulting in a remainder of 58.
The number 2 becomes the next digit in our result. 
Result so far: 6963.2
Subtracting 162 from 220 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
If we divide 580 by 81, we get 7 and a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 6963.27
Deduct 567 from 580 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 9:
When dividing 130 by 81, we get 1 with a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 6963.271
If we subtract 81 from 130, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 10:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 6963.2716
If we subtract 486 from 490, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
The number 81 fits into 40 0 times, leaving a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 6963.2716
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
81 goes into 400 4 times with a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 6963.271604
Subtract 324 from 400 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Moving on to step 13:
The number 81 fits into 760 9 times, leaving a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 6963.2716049
Subtract 729 from 760 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 14:
When dividing 310 by 81, we get 3 with a remainder of 67.
Use 3 as the next digit of our solution. 
Result so far: 6963.27160493
Subtract 243 from 310 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

After the division, we end up with 6963.27160493 and a remainder of 6.7e-08.