We're dividing 905001 by 81 
The aim is to understand the frequency of 81 in 905001.

Moving on to step 1:
9 divided by 81 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 81

On to step 2:
81 goes into 90 1 times with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 81 from 90 leaves us with 9.
Take the next digit (5) from the dividend and append it to 9, then repeat: 95 / 81

Advancing to step 3:
81 goes into 95 1 times with a remainder of 14.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 81 from 95 leaves us with 14.
Include the next digit (0) from the dividend after 14, then repeat: 140 / 81

On to step 4:
81 can be fit into 140 1 times, resulting in a remainder of 59.
Write down 1 as next digit of the result. 
Result so far: 111.0
Subtracting 81 from 140 leaves us with 59.
Fetch the next digit (0) from the dividend, attach it to 59 and continue: 590 / 81

Let's proceed to step 5:
If we divide 590 by 81, we get 7 and a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 1117.0
Deduct 567 from 590 and we're left with 23.
Include the next digit (1) from the dividend after 23, then repeat: 231 / 81

Going ahead to step 6:
81 can be fit into 231 2 times, resulting in a remainder of 69.
Use 2 as the next digit of our solution. 
Result so far: 11172.0
If we subtract 162 from 231, we 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.

On to step 7:
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: 11172.8
Subtract 648 from 690 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 8:
420 divided by 81 is 5 with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 11172.85
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.

On to step 9:
When dividing 150 by 81, we get 1 with a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 11172.851
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.

Moving on to step 10:
When dividing 690 by 81, we get 8 with a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 11172.8518
If we subtract 648 from 690, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 11:
The number 81 fits into 420 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 11172.85185
Subtracting 405 from 420 leaves us 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.

Moving on to step 12:
150 divided by 81 is 1 with a remainder of 69.
Write down 1 as next digit of the result. 
Result so far: 11172.851851
If we subtract 81 from 150, we 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.

On to step 13:
81 can be fit into 690 8 times, resulting in a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 11172.8518518
Subtract 648 from 690 to get 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 14:
The number 81 fits into 420 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 11172.85185185
Deduct 405 from 420 and we're left 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.

The final result is 11172.85185185 with a remainder of 1.5e-08.