We look at the division of 254724 by 90 
The aim is to understand the frequency of 90 in 254724.

Let's proceed to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Take the next digit (5) from the dividend and append it to 2, then repeat: 25 / 90

Step 2:
When dividing 25 by 90, we get 0 with a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Include the next digit (4) from the dividend after 25, then repeat: 254 / 90

Advancing to step 3:
If we divide 254 by 90, we get 2 and a remainder of 74.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 180 from 254 to get 74.
Fetch the next digit (7) from the dividend, attach it to 74 and continue: 747 / 90

Step 4:
If we divide 747 by 90, we get 8 and a remainder of 27.
Write down 8 as next digit of the result. 
Result so far: 28.0
Subtract 720 from 747 to get 27.
Bring next digit (2) of the dividend behind the 27 and repeat the process: 272 / 90

Let's proceed to step 5:
If we divide 272 by 90, we get 3 and a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 283.0
Subtracting 270 from 272 leaves us with 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 90

Let's proceed to step 6:
The number 90 fits into 24 0 times, leaving a remainder of 24.
Write down 0 as next digit of the result. 
Result so far: 2830.0
If we subtract 0 from 24, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 7:
90 can be fit into 240 2 times, resulting in a remainder of 60.
The number 2 becomes the next digit in our result. 
Result so far: 2830.2
If we take 180 away from 240, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 8:
600 divided by 90 is 6 with a remainder of 60.
The number 6 becomes the next digit in our result. 
Result so far: 2830.26
Subtracting 540 from 600 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
600 divided by 90 is 6 with a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 2830.266
If we subtract 540 from 600, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final outcome is 2830.266, with a leftover of 0.006.