We look at the division of 268081 by 90 
The aim is to understand the frequency of 90 in 268081.

On to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (6) from the dividend, attach it to 2 and continue: 26 / 90

Step 2:
The number 90 fits into 26 0 times, leaving a remainder of 26.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 26 and we're left with 26.
Fetch the next digit (8) from the dividend, attach it to 26 and continue: 268 / 90

Step 3:
90 can be fit into 268 2 times, resulting in a remainder of 88.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we take 180 away from 268, we end up with 88.
Include the next digit (0) from the dividend after 88, then repeat: 880 / 90

Going ahead to step 4:
When dividing 880 by 90, we get 9 with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 29.0
The remainder is 70 after subtracting 810 from 880.
Fetch the next digit (8) from the dividend, attach it to 70 and continue: 708 / 90

On to step 5:
The number 90 fits into 708 7 times, leaving a remainder of 78.
The number 7 becomes the next digit in our result. 
Result so far: 297.0
Subtracting 630 from 708 leaves us with 78.
Bring next digit (1) of the dividend behind the 78 and repeat the process: 781 / 90

Let's proceed to step 6:
90 can be fit into 781 8 times, resulting in a remainder of 61.
Put 8 as the next digit of the answer. 
Result so far: 2978.0
Deduct 720 from 781 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 7:
When dividing 610 by 90, we get 6 with a remainder of 70.
Use 6 as the next digit of our solution. 
Result so far: 2978.6
Subtract 540 from 610 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.

Moving on to step 8:
700 divided by 90 is 7 with a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 2978.67
The remainder is 70 after subtracting 630 from 700.
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 9:
If we divide 700 by 90, we get 7 and a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 2978.677
Deduct 630 from 700 and we're left 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 2978.677, with a leftover of 0.007.