647583 divided by 81 
The aim is to understand the frequency of 81 in 647583.

Step 1:
If we divide 6 by 81, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 81

Step 2:
81 can be fit into 64 0 times, resulting in a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Fetch the next digit (7) from the dividend, attach it to 64 and continue: 647 / 81

Step 3:
81 goes into 647 7 times with a remainder of 80.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtract 567 from 647 to get 80.
Bring next digit (5) of the dividend behind the 80 and repeat the process: 805 / 81

Step 4:
805 divided by 81 is 9 with a remainder of 76.
The number 9 becomes the next digit in our result. 
Result so far: 79.0
Deduct 729 from 805 and we're left with 76.
Fetch the next digit (8) from the dividend, attach it to 76 and continue: 768 / 81

Let's proceed to step 5:
When dividing 768 by 81, we get 9 with a remainder of 39.
Use 9 as the next digit of our solution. 
Result so far: 799.0
Deduct 729 from 768 and we're left with 39.
Bring next digit (3) of the dividend behind the 39 and repeat the process: 393 / 81

On to step 6:
If we divide 393 by 81, we get 4 and a remainder of 69.
Use 4 as the next digit of our solution. 
Result so far: 7994.0
If we take 324 away from 393, 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 7:
The number 81 fits into 690 8 times, leaving a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 7994.8
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.

On to step 8:
81 goes into 420 5 times with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 7994.85
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.

Let's proceed to step 9:
If we divide 150 by 81, we get 1 and a remainder of 69.
Record the quotient 1 as the next digit in the result. 
Result so far: 7994.851
Subtracting 81 from 150 leaves us 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.

Going ahead to step 10:
81 goes into 690 8 times with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 7994.8518
The remainder is 42 after subtracting 648 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 11:
420 divided by 81 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 7994.85185
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.

Step 12:
150 divided by 81 is 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 7994.851851
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.
Record the quotient 8 as the next digit in the result. 
Result so far: 7994.8518518
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.

Step 14:
420 divided by 81 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 7994.85185185
Subtract 405 from 420 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

In conclusion, the division gives 7994.85185185 with a balance of 1.5e-08.