Let's divide 591359 by 90
The aim is to understand the frequency of 90 in 591359.

On to step 1:
When dividing 5 by 90, we get 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 90

Advancing to step 2:
90 goes into 59 0 times with a remainder of 59.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 59 leaves us with 59.
Append the next digit (1) from the dividend to 59 and continue with: 591 / 90

Advancing to step 3:
When dividing 591 by 90, we get 6 with a remainder of 51.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 540 from 591 leaves us with 51.
Include the next digit (3) from the dividend after 51, then repeat: 513 / 90

Moving on to step 4:
90 can be fit into 513 5 times, resulting in a remainder of 63.
Put 5 as the next digit of the answer. 
Result so far: 65.0
Subtract 450 from 513 to get 63.
Take the next digit (5) from the dividend and append it to 63, then repeat: 635 / 90

Going ahead to step 5:
90 goes into 635 7 times with a remainder of 5.
Use 7 as the next digit of our solution. 
Result so far: 657.0
The remainder is 5 after subtracting 630 from 635.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 90

Let's proceed to step 6:
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: 6570.0
Deduct 0 from 59 and we're left with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

On to step 7:
The number 90 fits into 590 6 times, leaving a remainder of 50.
Write down 6 as next digit of the result. 
Result so far: 6570.6
Subtracting 540 from 590 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.

Moving on to step 8:
500 divided by 90 is 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 6570.65
Subtract 450 from 500 to 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:
When dividing 500 by 90, we get 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 6570.655
The remainder is 50 after subtracting 450 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final result is 6570.655 with a remainder of 0.005.