We look at the division of 969603 by 81 
The aim is to understand the frequency of 81 in 969603.

Step 1:
81 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 81

Moving on to step 2:
96 divided by 81 is 1 with a remainder of 15.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 81 from 96 leaves us with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 81

Let's proceed to step 3:
81 goes into 159 1 times with a remainder of 78.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we subtract 81 from 159, we get 78.
Take the next digit (6) from the dividend and append it to 78, then repeat: 786 / 81

Let's proceed to step 4:
When dividing 786 by 81, we get 9 with a remainder of 57.
Use 9 as the next digit of our solution. 
Result so far: 119.0
The remainder is 57 after subtracting 729 from 786.
Take the next digit (0) from the dividend and append it to 57, then repeat: 570 / 81

Going ahead to step 5:
If we divide 570 by 81, we get 7 and a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 1197.0
Subtracting 567 from 570 leaves us with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 81

Advancing to step 6:
The number 81 fits into 33 0 times, leaving a remainder of 33.
Use 0 as the next digit of our solution. 
Result so far: 11970.0
The remainder is 33 after subtracting 0 from 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 7:
81 can be fit into 330 4 times, resulting in a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 11970.4
Deduct 324 from 330 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
81 can be fit into 60 0 times, resulting in a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 11970.4
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 9:
When dividing 600 by 81, we get 7 with a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 11970.407
Subtract 567 from 600 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 10:
81 can be fit into 330 4 times, resulting in a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 11970.4074
Subtracting 324 from 330 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 11:
When dividing 60 by 81, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 11970.4074
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
The number 81 fits into 600 7 times, leaving a remainder of 33.
Use 7 as the next digit of our solution. 
Result so far: 11970.407407
The remainder is 33 after subtracting 567 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 13:
330 divided by 81 is 4 with a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 11970.4074074
If we subtract 324 from 330, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 14:
81 can be fit into 60 0 times, resulting in a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 11970.4074074
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

In conclusion, the division gives 11970.4074074 with a balance of 6e-08.