We divide 109968 by 90
The aim is to understand the frequency of 90 in 109968.

Going ahead to step 1:
90 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 90

Moving on to step 2:
When dividing 10 by 90, we get 0 with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 10 after subtracting 0 from 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 90

Moving on to step 3:
90 goes into 109 1 times with a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 90 from 109, we get 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 90

Advancing to step 4:
If we divide 199 by 90, we get 2 and a remainder of 19.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtract 180 from 199 to get 19.
Bring next digit (6) of the dividend behind the 19 and repeat the process: 196 / 90

Step 5:
196 divided by 90 is 2 with a remainder of 16.
The next digit of our result is 2. 
Result so far: 122.0
The remainder is 16 after subtracting 180 from 196.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 90

Let's proceed to step 6:
90 can be fit into 168 1 times, resulting in a remainder of 78.
Put 1 as the next digit of the answer. 
Result so far: 1221.0
Subtracting 90 from 168 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 7:
If we divide 780 by 90, we get 8 and a remainder of 60.
Write down 8 as next digit of the result. 
Result so far: 1221.8
Subtracting 720 from 780 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 8:
600 divided by 90 is 6 with a remainder of 60.
The next digit of our result is 6. 
Result so far: 1221.86
Deduct 540 from 600 and we're left 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.

Let's proceed to step 9:
600 divided by 90 is 6 with a remainder of 60.
Record the quotient 6 as the next digit in the result. 
Result so far: 1221.866
If we take 540 away from 600, 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.

The final result is 1221.866 with a remainder of 0.006.