Let's divide 649770 by 81
The aim is to understand the frequency of 81 in 649770.

Advancing to step 1:
6 divided by 81 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 81

Let's proceed to step 2:
81 can be fit into 64 0 times, resulting in a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Append the next digit (9) from the dividend to 64 and continue with: 649 / 81

On to step 3:
When dividing 649 by 81, we get 8 with a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 648 from 649, we get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 81

Going ahead to step 4:
When dividing 17 by 81, we get 0 with a remainder of 17.
The next digit of our result is 0. 
Result so far: 80.0
Deduct 0 from 17 and we're left with 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 81

Step 5:
81 can be fit into 177 2 times, resulting in a remainder of 15.
Write down 2 as next digit of the result. 
Result so far: 802.0
If we subtract 162 from 177, we get 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 81

Moving on to step 6:
150 divided by 81 is 1 with a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 8021.0
Subtract 81 from 150 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 7:
If we divide 690 by 81, we get 8 and a remainder of 42.
The next digit of our result is 8. 
Result so far: 8021.8
Deduct 648 from 690 and we're left 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.

Advancing to step 8:
81 goes into 420 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 8021.85
Deduct 405 from 420 and we're left 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 9:
150 divided by 81 is 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 8021.851
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.

Moving on to step 10:
If we divide 690 by 81, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 8021.8518
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 11:
420 divided by 81 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 8021.85185
Subtracting 405 from 420 leaves us 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.

On to step 12:
The number 81 fits into 150 1 times, leaving a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 8021.851851
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.

On to step 13:
The number 81 fits into 690 8 times, leaving a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 8021.8518518
Deduct 648 from 690 and we're left 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.

Advancing to step 14:
81 goes into 420 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 8021.85185185
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.

Our division results in 8021.85185185 with a remaining 1.5e-08.