900946 ÷ 81 
The aim is to understand the frequency of 81 in 900946.

Moving on to step 1:
The number 81 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 81

On to step 2:
81 goes into 90 1 times with a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 9 after subtracting 81 from 90.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 81

Let's proceed to step 3:
90 divided by 81 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 11.0
Subtract 81 from 90 to get 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 81

Moving on to step 4:
When dividing 99 by 81, we get 1 with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 111.0
If we subtract 81 from 99, we get 18.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 81

Step 5:
81 can be fit into 184 2 times, resulting in a remainder of 22.
Write down 2 as next digit of the result. 
Result so far: 1112.0
Deduct 162 from 184 and we're left with 22.
Fetch the next digit (6) from the dividend, attach it to 22 and continue: 226 / 81

On to step 6:
The number 81 fits into 226 2 times, leaving a remainder of 64.
The number 2 becomes the next digit in our result. 
Result so far: 11122.0
If we subtract 162 from 226, 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.

Moving on to step 7:
640 divided by 81 is 7 with a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 11122.7
Subtract 567 from 640 to get 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 8:
The number 81 fits into 730 9 times, leaving a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 11122.79
If we take 729 away from 730, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
81 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 11122.79
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
The number 81 fits into 100 1 times, leaving a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 11122.7901
The remainder is 19 after subtracting 81 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 11:
When dividing 190 by 81, we get 2 with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 11122.79012
Subtract 162 from 190 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 12:
When dividing 280 by 81, we get 3 with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 11122.790123
Deduct 243 from 280 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 13:
81 goes into 370 4 times with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 11122.7901234
Deduct 324 from 370 and we're left 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.

Advancing to step 14:
When dividing 460 by 81, we get 5 with a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 11122.79012345
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.

In conclusion, the division gives 11122.79012345 with a balance of 5.5e-08.