We look at the division of 82915 by 90 
The aim is to understand the frequency of 90 in 82915.

Step 1:
The number 90 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (2) from the dividend and append it to 8, then repeat: 82 / 90

Going ahead to step 2:
90 goes into 82 0 times with a remainder of 82.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 82 and we're left with 82.
Take the next digit (9) from the dividend and append it to 82, then repeat: 829 / 90

Let's proceed to step 3:
90 can be fit into 829 9 times, resulting in a remainder of 19.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we subtract 810 from 829, we get 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 90

Moving on to step 4:
90 goes into 191 2 times with a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 92.0
If we subtract 180 from 191, we get 11.
Grab the next digit (5) from the dividend, add it to 11, then carry on: 115 / 90

Advancing to step 5:
The number 90 fits into 115 1 times, leaving a remainder of 25.
Use 1 as the next digit of our solution. 
Result so far: 921.0
Subtracting 90 from 115 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 6:
If we divide 250 by 90, we get 2 and a remainder of 70.
The next digit of our result is 2. 
Result so far: 921.2
Subtract 180 from 250 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 7:
90 goes into 700 7 times with a remainder of 70.
Write down 7 as next digit of the result. 
Result so far: 921.27
If we take 630 away from 700, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 8:
The number 90 fits into 700 7 times, leaving a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 921.277
Subtracting 630 from 700 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 921.277, with a leftover of 0.007.