805331 ÷ 90 
The aim is to understand the frequency of 90 in 805331.

Step 1:
When dividing 8 by 90, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 90

Step 2:
When dividing 80 by 90, we get 0 with a remainder of 80.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 80 leaves us with 80.
Take the next digit (5) from the dividend and append it to 80, then repeat: 805 / 90

Going ahead to step 3:
The number 90 fits into 805 8 times, leaving a remainder of 85.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 720 from 805 and we're left with 85.
Fetch the next digit (3) from the dividend, attach it to 85 and continue: 853 / 90

On to step 4:
853 divided by 90 is 9 with a remainder of 43.
Use 9 as the next digit of our solution. 
Result so far: 89.0
If we subtract 810 from 853, we get 43.
Take the next digit (3) from the dividend and append it to 43, then repeat: 433 / 90

Advancing to step 5:
When dividing 433 by 90, we get 4 with a remainder of 73.
Record the quotient 4 as the next digit in the result. 
Result so far: 894.0
If we subtract 360 from 433, we get 73.
Bring next digit (1) of the dividend behind the 73 and repeat the process: 731 / 90

Moving on to step 6:
731 divided by 90 is 8 with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 8948.0
Subtracting 720 from 731 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
If we divide 110 by 90, we get 1 and a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 8948.1
If we take 90 away from 110, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
90 goes into 200 2 times with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 8948.12
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 9:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 8948.122
If we take 180 away from 200, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 8948.122, and the remainder is 0.002.