We look at the division of 909656 by 90 
The aim is to understand the frequency of 90 in 909656.

Moving on to step 1:
The number 90 fits into 9 0 times, leaving a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 90

Advancing to step 2:
90 can be fit into 90 1 times, resulting in a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 90 from 90 to get 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 90

Advancing to step 3:
90 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we subtract 0 from 9, we get 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 90

Going ahead to step 4:
The number 90 fits into 96 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
Subtract 90 from 96 to get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 90

Let's proceed to step 5:
The number 90 fits into 65 0 times, leaving a remainder of 65.
Write down 0 as next digit of the result. 
Result so far: 1010.0
The remainder is 65 after subtracting 0 from 65.
Bring next digit (6) of the dividend behind the 65 and repeat the process: 656 / 90

On to step 6:
90 goes into 656 7 times with a remainder of 26.
Write down 7 as next digit of the result. 
Result so far: 10107.0
If we subtract 630 from 656, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 7:
260 divided by 90 is 2 with a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 10107.2
The remainder is 80 after subtracting 180 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 8:
90 goes into 800 8 times with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 10107.28
If we take 720 away from 800, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
When dividing 800 by 90, we get 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 10107.288
Subtract 720 from 800 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 10107.288 with a remainder of 0.008.