Let's divide 589573 by 90
The aim is to understand the frequency of 90 in 589573.

Moving on to step 1:
When dividing 5 by 90, we get 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 90

On to step 2:
90 goes into 58 0 times with a remainder of 58.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 58 after subtracting 0 from 58.
Bring next digit (9) of the dividend behind the 58 and repeat the process: 589 / 90

Moving on to step 3:
When dividing 589 by 90, we get 6 with a remainder of 49.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 540 from 589, we get 49.
Take the next digit (5) from the dividend and append it to 49, then repeat: 495 / 90

Step 4:
495 divided by 90 is 5 with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 65.0
Deduct 450 from 495 and we're left with 45.
Fetch the next digit (7) from the dividend, attach it to 45 and continue: 457 / 90

Step 5:
The number 90 fits into 457 5 times, leaving a remainder of 7.
Record the quotient 5 as the next digit in the result. 
Result so far: 655.0
Subtracting 450 from 457 leaves us with 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 90

Advancing to step 6:
90 goes into 73 0 times with a remainder of 73.
Write down 0 as next digit of the result. 
Result so far: 6550.0
If we take 0 away from 73, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 7:
The number 90 fits into 730 8 times, leaving a remainder of 10.
The next digit of our result is 8. 
Result so far: 6550.8
Subtracting 720 from 730 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
100 divided by 90 is 1 with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 6550.81
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
If we divide 100 by 90, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 6550.811
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 6550.811, with a leftover of 0.001.