We look at the division of 973203 by 81 
The aim is to understand the frequency of 81 in 973203.

Let's proceed to step 1:
9 divided by 81 is 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (7) from the dividend to 9 and continue with: 97 / 81

On to step 2:
When dividing 97 by 81, we get 1 with a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 81 from 97 leaves us with 16.
Include the next digit (3) from the dividend after 16, then repeat: 163 / 81

Moving on to step 3:
81 goes into 163 2 times with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 162 from 163 to get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 81

Going ahead to step 4:
When dividing 12 by 81, we get 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 120.0
Subtracting 0 from 12 leaves us with 12.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 81

On to step 5:
120 divided by 81 is 1 with a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 1201.0
Subtracting 81 from 120 leaves us with 39.
Fetch the next digit (3) from the dividend, attach it to 39 and continue: 393 / 81

Step 6:
81 goes into 393 4 times with a remainder of 69.
Write down 4 as next digit of the result. 
Result so far: 12014.0
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:
81 can be fit into 690 8 times, resulting in a remainder of 42.
The next digit of our result is 8. 
Result so far: 12014.8
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.

Going ahead to step 8:
When dividing 420 by 81, we get 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 12014.85
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.

Going ahead to step 9:
If we divide 150 by 81, we get 1 and a remainder of 69.
The next digit of our result is 1. 
Result so far: 12014.851
If we take 81 away from 150, 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 10:
The number 81 fits into 690 8 times, leaving a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 12014.8518
If we take 648 away from 690, we end up 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 11:
81 goes into 420 5 times with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 12014.85185
If we subtract 405 from 420, we 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.

Advancing to step 12:
81 goes into 150 1 times with a remainder of 69.
The number 1 becomes the next digit in our result. 
Result so far: 12014.851851
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 13:
81 can be fit into 690 8 times, resulting in a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 12014.8518518
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:
81 goes into 420 5 times with a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 12014.85185185
If we subtract 405 from 420, we 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 12014.85185185 with a remaining 1.5e-08.