98903 divided by 90 
The aim is to understand the frequency of 90 in 98903.

Let's proceed to step 1:
If we divide 9 by 90, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 90

Advancing to step 2:
90 goes into 98 1 times with a remainder of 8.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 90 from 98 leaves us with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 90

Step 3:
90 can be fit into 89 0 times, resulting in a remainder of 89.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 89 leaves us with 89.
Grab the next digit (0) from the dividend, add it to 89, then carry on: 890 / 90

Step 4:
When dividing 890 by 90, we get 9 with a remainder of 80.
The number 9 becomes the next digit in our result. 
Result so far: 109.0
If we subtract 810 from 890, we get 80.
Bring next digit (3) of the dividend behind the 80 and repeat the process: 803 / 90

On to step 5:
803 divided by 90 is 8 with a remainder of 83.
Put 8 as the next digit of the answer. 
Result so far: 1098.0
Subtract 720 from 803 to get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Step 6:
90 can be fit into 830 9 times, resulting in a remainder of 20.
Put 9 as the next digit of the answer. 
Result so far: 1098.9
Deduct 810 from 830 and we're left 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.

Step 7:
The number 90 fits into 200 2 times, leaving a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 1098.92
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 8:
When dividing 200 by 90, we get 2 with a remainder of 20.
The next digit of our result is 2. 
Result so far: 1098.922
Subtracting 180 from 200 leaves us 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 final result is 1098.922 with a remainder of 0.002.