We're dividing 722671 by 81 
The aim is to understand the frequency of 81 in 722671.

Advancing to step 1:
When dividing 7 by 81, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 81

Step 2:
If we divide 72 by 81, we get 0 and a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Append the next digit (2) from the dividend to 72 and continue with: 722 / 81

Step 3:
81 can be fit into 722 8 times, resulting in a remainder of 74.
Use 8 as the next digit of our solution. 
Result so far: 8.0
The remainder is 74 after subtracting 648 from 722.
Bring next digit (6) of the dividend behind the 74 and repeat the process: 746 / 81

On to step 4:
81 goes into 746 9 times with a remainder of 17.
The next digit of our result is 9. 
Result so far: 89.0
If we take 729 away from 746, we end up with 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 81

Moving on to step 5:
81 goes into 177 2 times with a remainder of 15.
Record the quotient 2 as the next digit in the result. 
Result so far: 892.0
The remainder is 15 after subtracting 162 from 177.
Fetch the next digit (1) from the dividend, attach it to 15 and continue: 151 / 81

Moving on to step 6:
81 can be fit into 151 1 times, resulting in a remainder of 70.
The next digit of our result is 1. 
Result so far: 8921.0
Deduct 81 from 151 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 7:
When dividing 700 by 81, we get 8 with a remainder of 52.
The next digit of our result is 8. 
Result so far: 8921.8
The remainder is 52 after subtracting 648 from 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 8:
81 goes into 520 6 times with a remainder of 34.
Record the quotient 6 as the next digit in the result. 
Result so far: 8921.86
Deduct 486 from 520 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 9:
81 can be fit into 340 4 times, resulting in a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 8921.864
If we subtract 324 from 340, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
81 goes into 160 1 times with a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 8921.8641
Subtract 81 from 160 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 11:
The number 81 fits into 790 9 times, leaving a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 8921.86419
If we subtract 729 from 790, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 12:
81 can be fit into 610 7 times, resulting in a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 8921.864197
If we take 567 away from 610, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 13:
When dividing 430 by 81, we get 5 with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 8921.8641975
Deduct 405 from 430 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 14:
The number 81 fits into 250 3 times, leaving a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 8921.86419753
Deduct 243 from 250 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Our division results in 8921.86419753 with a remaining 7e-09.