We're dividing 964580 by 81 
The aim is to understand the frequency of 81 in 964580.

Moving on to step 1:
The number 81 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Take the next digit (6) from the dividend and append it to 9, then repeat: 96 / 81

On to step 2:
81 can be fit into 96 1 times, resulting in a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 81 from 96 to get 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 81

Advancing to step 3:
81 goes into 154 1 times with a remainder of 73.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Deduct 81 from 154 and we're left with 73.
Fetch the next digit (5) from the dividend, attach it to 73 and continue: 735 / 81

Step 4:
81 goes into 735 9 times with a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 119.0
If we take 729 away from 735, we end up with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 81

On to step 5:
When dividing 68 by 81, we get 0 with a remainder of 68.
Put 0 as the next digit of the answer. 
Result so far: 1190.0
Subtracting 0 from 68 leaves us with 68.
Append the next digit (0) from the dividend to 68 and continue with: 680 / 81

Moving on to step 6:
81 goes into 680 8 times with a remainder of 32.
Write down 8 as next digit of the result. 
Result so far: 11908.0
Deduct 648 from 680 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 7:
81 goes into 320 3 times with a remainder of 77.
Use 3 as the next digit of our solution. 
Result so far: 11908.3
Subtracting 243 from 320 leaves us with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 8:
When dividing 770 by 81, we get 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 11908.39
If we subtract 729 from 770, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Advancing to step 9:
If we divide 410 by 81, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 11908.395
Subtract 405 from 410 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 10:
The number 81 fits into 50 0 times, leaving a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 11908.395
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 11:
When dividing 500 by 81, we get 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 11908.39506
Subtracting 486 from 500 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 12:
If we divide 140 by 81, we get 1 and a remainder of 59.
The next digit of our result is 1. 
Result so far: 11908.395061
The remainder is 59 after subtracting 81 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 13:
When dividing 590 by 81, we get 7 with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 11908.3950617
If we subtract 567 from 590, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 14:
The number 81 fits into 230 2 times, leaving a remainder of 68.
Record the quotient 2 as the next digit in the result. 
Result so far: 11908.39506172
If we subtract 162 from 230, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

After the division, we end up with 11908.39506172 and a remainder of 6.8e-08.