We're dividing 647020 by 81 
The aim is to understand the frequency of 81 in 647020.

Going ahead to step 1:
When dividing 6 by 81, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 81

Let's proceed to step 2:
64 divided by 81 is 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Fetch the next digit (7) from the dividend, attach it to 64 and continue: 647 / 81

Going ahead to step 3:
When dividing 647 by 81, we get 7 with a remainder of 80.
Use 7 as the next digit of our solution. 
Result so far: 7.0
The remainder is 80 after subtracting 567 from 647.
Grab the next digit (0) from the dividend, add it to 80, then carry on: 800 / 81

Moving on to step 4:
If we divide 800 by 81, we get 9 and a remainder of 71.
Use 9 as the next digit of our solution. 
Result so far: 79.0
If we subtract 729 from 800, we get 71.
Append the next digit (2) from the dividend to 71 and continue with: 712 / 81

Going ahead to step 5:
81 goes into 712 8 times with a remainder of 64.
The next digit of our result is 8. 
Result so far: 798.0
Subtract 648 from 712 to get 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 81

Going ahead to step 6:
If we divide 640 by 81, we get 7 and a remainder of 73.
The next digit of our result is 7. 
Result so far: 7987.0
Deduct 567 from 640 and we're left 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.

Let's proceed to step 7:
When dividing 730 by 81, we get 9 with a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 7987.9
If we subtract 729 from 730, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 8:
81 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 7987.9
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
When dividing 100 by 81, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 7987.901
The remainder is 19 after subtracting 81 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 10:
The number 81 fits into 190 2 times, leaving a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 7987.9012
Subtract 162 from 190 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 11:
When dividing 280 by 81, we get 3 with a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 7987.90123
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 12:
When dividing 370 by 81, we get 4 with a remainder of 46.
Use 4 as the next digit of our solution. 
Result so far: 7987.901234
If we take 324 away from 370, we end up 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 13:
If we divide 460 by 81, we get 5 and a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 7987.9012345
Subtracting 405 from 460 leaves us with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 14:
81 goes into 550 6 times with a remainder of 64.
The next digit of our result is 6. 
Result so far: 7987.90123456
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.

The final outcome is 7987.90123456, with a leftover of 6.4e-08.