We look at the division of 955845 by 90 
The aim is to understand the frequency of 90 in 955845.

On to step 1:
90 goes into 9 0 times with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (5) of the dividend behind the 9 and repeat the process: 95 / 90

On to step 2:
95 divided by 90 is 1 with a remainder of 5.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 5 after subtracting 90 from 95.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 90

Step 3:
If we divide 55 by 90, we get 0 and a remainder of 55.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 55 leaves us with 55.
Take the next digit (8) from the dividend and append it to 55, then repeat: 558 / 90

Let's proceed to step 4:
The number 90 fits into 558 6 times, leaving a remainder of 18.
Write down 6 as next digit of the result. 
Result so far: 106.0
Subtract 540 from 558 to get 18.
Bring next digit (4) of the dividend behind the 18 and repeat the process: 184 / 90

Advancing to step 5:
184 divided by 90 is 2 with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 1062.0
Subtracting 180 from 184 leaves us with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 90

On to step 6:
The number 90 fits into 45 0 times, leaving a remainder of 45.
Use 0 as the next digit of our solution. 
Result so far: 10620.0
If we subtract 0 from 45, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 7:
The number 90 fits into 450 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 10620.5
Deduct 450 from 450 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
The number 90 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10620.5
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
When dividing 0 by 90, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10620.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 10620.5 with a remainder of 0.0.