We're dividing 596859 by 90 
The aim is to understand the frequency of 90 in 596859.

Moving on to step 1:
5 divided by 90 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 90

Moving on to step 2:
When dividing 59 by 90, we get 0 with a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 59, we get 59.
Bring next digit (6) of the dividend behind the 59 and repeat the process: 596 / 90

Let's proceed to step 3:
90 can be fit into 596 6 times, resulting in a remainder of 56.
Put 6 as the next digit of the answer. 
Result so far: 6.0
Deduct 540 from 596 and we're left with 56.
Include the next digit (8) from the dividend after 56, then repeat: 568 / 90

Going ahead to step 4:
90 goes into 568 6 times with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 66.0
Subtracting 540 from 568 leaves us with 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 90

Moving on to step 5:
When dividing 285 by 90, we get 3 with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 663.0
Subtracting 270 from 285 leaves us with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 90

Going ahead to step 6:
90 goes into 159 1 times with a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 6631.0
The remainder is 69 after subtracting 90 from 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 7:
When dividing 690 by 90, we get 7 with a remainder of 60.
Put 7 as the next digit of the answer. 
Result so far: 6631.7
Deduct 630 from 690 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.

Going ahead to step 8:
The number 90 fits into 600 6 times, leaving a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 6631.76
Subtract 540 from 600 to 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 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
Put 6 as the next digit of the answer. 
Result so far: 6631.766
Subtracting 540 from 600 leaves us 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.

After the division, we end up with 6631.766 and a remainder of 0.006.