Let's divide 287360 by 90
The aim is to understand the frequency of 90 in 287360.

On to step 1:
90 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 90

On to step 2:
When dividing 28 by 90, we get 0 with a remainder of 28.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 28 to get 28.
Fetch the next digit (7) from the dividend, attach it to 28 and continue: 287 / 90

Let's proceed to step 3:
When dividing 287 by 90, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 3.0
If we take 270 away from 287, we end up with 17.
Bring next digit (3) of the dividend behind the 17 and repeat the process: 173 / 90

Advancing to step 4:
When dividing 173 by 90, we get 1 with a remainder of 83.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Subtract 90 from 173 to get 83.
Grab the next digit (6) from the dividend, add it to 83, then carry on: 836 / 90

Going ahead to step 5:
90 can be fit into 836 9 times, resulting in a remainder of 26.
The next digit of our result is 9. 
Result so far: 319.0
Subtract 810 from 836 to get 26.
Grab the next digit (0) from the dividend, add it to 26, then carry on: 260 / 90

Moving on to step 6:
When dividing 260 by 90, we get 2 with a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 3192.0
Subtracting 180 from 260 leaves us 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.

Step 7:
90 can be fit into 800 8 times, resulting in a remainder of 80.
The next digit of our result is 8. 
Result so far: 3192.8
Deduct 720 from 800 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.

Advancing to step 8:
The number 90 fits into 800 8 times, leaving a remainder of 80.
Use 8 as the next digit of our solution. 
Result so far: 3192.88
Deduct 720 from 800 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.

The final result is 3192.88 with a remainder of 0.08.