Let's divide 728304 by 90
The aim is to understand the frequency of 90 in 728304.

On to step 1:
90 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 90

Going ahead to step 2:
90 can be fit into 72 0 times, resulting in a remainder of 72.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 72, we end up with 72.
Grab the next digit (8) from the dividend, add it to 72, then carry on: 728 / 90

Going ahead to step 3:
728 divided by 90 is 8 with a remainder of 8.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
If we subtract 720 from 728, we get 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 90

Moving on to step 4:
The number 90 fits into 83 0 times, leaving a remainder of 83.
Put 0 as the next digit of the answer. 
Result so far: 80.0
Subtracting 0 from 83 leaves us with 83.
Include the next digit (0) from the dividend after 83, then repeat: 830 / 90

Advancing to step 5:
90 can be fit into 830 9 times, resulting in a remainder of 20.
The next digit of our result is 9. 
Result so far: 809.0
Subtract 810 from 830 to get 20.
Include the next digit (4) from the dividend after 20, then repeat: 204 / 90

On to step 6:
When dividing 204 by 90, we get 2 with a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 8092.0
Deduct 180 from 204 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
If we divide 240 by 90, we get 2 and a remainder of 60.
Put 2 as the next digit of the answer. 
Result so far: 8092.2
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.

On to step 8:
If we divide 600 by 90, we get 6 and a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 8092.26
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.

Moving on to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
The next digit of our result is 6. 
Result so far: 8092.266
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.

After the division, we end up with 8092.266 and a remainder of 0.006.