Let's divide 275594 by 90
The aim is to understand the frequency of 90 in 275594.

Going ahead to step 1:
The number 90 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Fetch the next digit (7) from the dividend, attach it to 2 and continue: 27 / 90

Going ahead to step 2:
27 divided by 90 is 0 with a remainder of 27.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 27, we get 27.
Include the next digit (5) from the dividend after 27, then repeat: 275 / 90

On to step 3:
The number 90 fits into 275 3 times, leaving a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Deduct 270 from 275 and we're left with 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 90

Moving on to step 4:
90 can be fit into 55 0 times, resulting in a remainder of 55.
The next digit of our result is 0. 
Result so far: 30.0
The remainder is 55 after subtracting 0 from 55.
Bring next digit (9) of the dividend behind the 55 and repeat the process: 559 / 90

Advancing to step 5:
If we divide 559 by 90, we get 6 and a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 306.0
Subtracting 540 from 559 leaves us with 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 90

Going ahead to step 6:
When dividing 194 by 90, we get 2 with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 3062.0
If we subtract 180 from 194, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 7:
If we divide 140 by 90, we get 1 and a remainder of 50.
Write down 1 as next digit of the result. 
Result so far: 3062.1
If we take 90 away from 140, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 8:
If we divide 500 by 90, we get 5 and a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 3062.15
If we subtract 450 from 500, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 9:
90 can be fit into 500 5 times, resulting in a remainder of 50.
The next digit of our result is 5. 
Result so far: 3062.155
Subtracting 450 from 500 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 3062.155 and a remainder of 0.005.