Let's divide 888668 by 90
The aim is to understand the frequency of 90 in 888668.

Advancing to step 1:
If we divide 8 by 90, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (8) from the dividend and append it to 8, then repeat: 88 / 90

Moving on to step 2:
88 divided by 90 is 0 with a remainder of 88.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 88 leaves us with 88.
Fetch the next digit (8) from the dividend, attach it to 88 and continue: 888 / 90

Let's proceed to step 3:
If we divide 888 by 90, we get 9 and a remainder of 78.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtracting 810 from 888 leaves us with 78.
Include the next digit (6) from the dividend after 78, then repeat: 786 / 90

On to step 4:
When dividing 786 by 90, we get 8 with a remainder of 66.
Write down 8 as next digit of the result. 
Result so far: 98.0
If we subtract 720 from 786, we get 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 90

Step 5:
The number 90 fits into 666 7 times, leaving a remainder of 36.
The next digit of our result is 7. 
Result so far: 987.0
The remainder is 36 after subtracting 630 from 666.
Take the next digit (8) from the dividend and append it to 36, then repeat: 368 / 90

Step 6:
90 can be fit into 368 4 times, resulting in a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 9874.0
If we take 360 away from 368, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
If we divide 80 by 90, we get 0 and a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 9874.0
Deduct 0 from 80 and we're left 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.

Moving on to step 8:
90 can be fit into 800 8 times, resulting in a remainder of 80.
The number 8 becomes the next digit in our result. 
Result so far: 9874.08
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.

On to step 9:
When dividing 800 by 90, we get 8 with a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 9874.088
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 9874.088, with a leftover of 0.008.