559814 divided by 90 
The aim is to understand the frequency of 90 in 559814.

Step 1:
90 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (5) of the dividend behind the 5 and repeat the process: 55 / 90

Moving on to step 2:
When dividing 55 by 90, we get 0 with a remainder of 55.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 55 after subtracting 0 from 55.
Append the next digit (9) from the dividend to 55 and continue with: 559 / 90

On to step 3:
When dividing 559 by 90, we get 6 with a remainder of 19.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 19 after subtracting 540 from 559.
Append the next digit (8) from the dividend to 19 and continue with: 198 / 90

Moving on to step 4:
When dividing 198 by 90, we get 2 with a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 62.0
The remainder is 18 after subtracting 180 from 198.
Fetch the next digit (1) from the dividend, attach it to 18 and continue: 181 / 90

Let's proceed to step 5:
The number 90 fits into 181 2 times, leaving a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 622.0
If we take 180 away from 181, we end up with 1.
Bring next digit (4) of the dividend behind the 1 and repeat the process: 14 / 90

Advancing to step 6:
The number 90 fits into 14 0 times, leaving a remainder of 14.
The next digit of our result is 0. 
Result so far: 6220.0
The remainder is 14 after subtracting 0 from 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
When dividing 140 by 90, we get 1 with a remainder of 50.
The next digit of our result is 1. 
Result so far: 6220.1
Deduct 90 from 140 and we're left 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.

Let's proceed to step 8:
90 goes into 500 5 times with a remainder of 50.
The next digit of our result is 5. 
Result so far: 6220.15
If we take 450 away from 500, 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.

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: 6220.155
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.

The final result is 6220.155 with a remainder of 0.005.