We look at the division of 980175 by 90 
The aim is to understand the frequency of 90 in 980175.

Step 1:
When dividing 9 by 90, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 90

On to step 2:
The number 90 fits into 98 1 times, leaving a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 90 from 98, we get 8.
Fetch the next digit (0) from the dividend, attach it to 8 and continue: 80 / 90

Advancing to step 3:
80 divided by 90 is 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Deduct 0 from 80 and we're left with 80.
Fetch the next digit (1) from the dividend, attach it to 80 and continue: 801 / 90

Going ahead to step 4:
When dividing 801 by 90, we get 8 with a remainder of 81.
The next digit of our result is 8. 
Result so far: 108.0
If we subtract 720 from 801, we get 81.
Take the next digit (7) from the dividend and append it to 81, then repeat: 817 / 90

Step 5:
When dividing 817 by 90, we get 9 with a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 1089.0
If we take 810 away from 817, we end up with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 90

Going ahead to step 6:
90 can be fit into 75 0 times, resulting in a remainder of 75.
The next digit of our result is 0. 
Result so far: 10890.0
Subtract 0 from 75 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 7:
90 can be fit into 750 8 times, resulting in a remainder of 30.
Write down 8 as next digit of the result. 
Result so far: 10890.8
The remainder is 30 after subtracting 720 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
When dividing 300 by 90, we get 3 with a remainder of 30.
Use 3 as the next digit of our solution. 
Result so far: 10890.83
If we take 270 away from 300, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
90 goes into 300 3 times with a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 10890.833
The remainder is 30 after subtracting 270 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 10890.833, with a leftover of 0.003.