We're dividing 595572 by 90 
The aim is to understand the frequency of 90 in 595572.

Let's proceed to step 1:
If we divide 5 by 90, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (9) from the dividend after 5, then repeat: 59 / 90

Going ahead to step 2:
If we divide 59 by 90, we get 0 and a remainder of 59.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 59 leaves us with 59.
Fetch the next digit (5) from the dividend, attach it to 59 and continue: 595 / 90

On to step 3:
When dividing 595 by 90, we get 6 with a remainder of 55.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 55 after subtracting 540 from 595.
Fetch the next digit (5) from the dividend, attach it to 55 and continue: 555 / 90

Let's proceed to step 4:
555 divided by 90 is 6 with a remainder of 15.
Put 6 as the next digit of the answer. 
Result so far: 66.0
If we take 540 away from 555, we end up with 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 90

Moving on to step 5:
90 can be fit into 157 1 times, resulting in a remainder of 67.
Use 1 as the next digit of our solution. 
Result so far: 661.0
Deduct 90 from 157 and we're left with 67.
Bring next digit (2) of the dividend behind the 67 and repeat the process: 672 / 90

On to step 6:
90 can be fit into 672 7 times, resulting in a remainder of 42.
Write down 7 as next digit of the result. 
Result so far: 6617.0
If we take 630 away from 672, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 7:
90 can be fit into 420 4 times, resulting in a remainder of 60.
The next digit of our result is 4. 
Result so far: 6617.4
If we subtract 360 from 420, 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.

Step 8:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 6617.46
The remainder is 60 after subtracting 540 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
600 divided by 90 is 6 with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 6617.466
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.

The final outcome is 6617.466, with a leftover of 0.006.