We look at the division of 85949 by 90 
The aim is to understand the frequency of 90 in 85949.

Step 1:
8 divided by 90 is 0 with 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.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 90

Advancing to step 2:
90 can be fit into 85 0 times, resulting in a remainder of 85.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 85, we get 85.
Append the next digit (9) from the dividend to 85 and continue with: 859 / 90

Moving on to step 3:
90 can be fit into 859 9 times, resulting in a remainder of 49.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 49 after subtracting 810 from 859.
Include the next digit (4) from the dividend after 49, then repeat: 494 / 90

Moving on to step 4:
90 goes into 494 5 times with a remainder of 44.
Use 5 as the next digit of our solution. 
Result so far: 95.0
If we take 450 away from 494, we end up with 44.
Fetch the next digit (9) from the dividend, attach it to 44 and continue: 449 / 90

Moving on to step 5:
When dividing 449 by 90, we get 4 with a remainder of 89.
Put 4 as the next digit of the answer. 
Result so far: 954.0
Subtracting 360 from 449 leaves us with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

On to step 6:
890 divided by 90 is 9 with a remainder of 80.
The next digit of our result is 9. 
Result so far: 954.9
Subtract 810 from 890 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.

Let's proceed to step 7:
The number 90 fits into 800 8 times, leaving a remainder of 80.
Put 8 as the next digit of the answer. 
Result so far: 954.98
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.

On to step 8:
800 divided by 90 is 8 with a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 954.988
The remainder is 80 after subtracting 720 from 800.
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 outcome is 954.988, with a leftover of 0.008.