We look at the division of 464005 by 81 
The aim is to understand the frequency of 81 in 464005.

On to step 1:
When dividing 4 by 81, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (6) from the dividend after 4, then repeat: 46 / 81

Let's proceed to step 2:
81 goes into 46 0 times with a remainder of 46.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 46 after subtracting 0 from 46.
Include the next digit (4) from the dividend after 46, then repeat: 464 / 81

Step 3:
The number 81 fits into 464 5 times, leaving a remainder of 59.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 405 from 464 to get 59.
Include the next digit (0) from the dividend after 59, then repeat: 590 / 81

Going ahead to step 4:
81 can be fit into 590 7 times, resulting in a remainder of 23.
The next digit of our result is 7. 
Result so far: 57.0
Subtract 567 from 590 to get 23.
Append the next digit (0) from the dividend to 23 and continue with: 230 / 81

Moving on to step 5:
The number 81 fits into 230 2 times, leaving a remainder of 68.
Use 2 as the next digit of our solution. 
Result so far: 572.0
If we subtract 162 from 230, we get 68.
Include the next digit (5) from the dividend after 68, then repeat: 685 / 81

On to step 6:
If we divide 685 by 81, we get 8 and a remainder of 37.
Write down 8 as next digit of the result. 
Result so far: 5728.0
The remainder is 37 after subtracting 648 from 685.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 7:
When dividing 370 by 81, we get 4 with a remainder of 46.
The next digit of our result is 4. 
Result so far: 5728.4
Subtracting 324 from 370 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 8:
81 can be fit into 460 5 times, resulting in a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 5728.45
If we take 405 away from 460, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Advancing to step 9:
81 goes into 550 6 times with a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 5728.456
If we subtract 486 from 550, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 10:
81 can be fit into 640 7 times, resulting in a remainder of 73.
Put 7 as the next digit of the answer. 
Result so far: 5728.4567
Subtracting 567 from 640 leaves us with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 11:
81 can be fit into 730 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 5728.45679
The remainder is 1 after subtracting 729 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 12:
The number 81 fits into 10 0 times, leaving a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 5728.45679
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 13:
The number 81 fits into 100 1 times, leaving a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 5728.4567901
If we subtract 81 from 100, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 14:
The number 81 fits into 190 2 times, leaving a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 5728.45679012
Subtracting 162 from 190 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The quotient of the division is 5728.45679012, and the remainder is 2.8e-08.