559423 ÷ 90 
The aim is to understand the frequency of 90 in 559423.

Let's proceed to step 1:
The number 90 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 90

Step 2:
55 divided by 90 is 0 with a remainder of 55.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 55 and we're left with 55.
Take the next digit (9) from the dividend and append it to 55, then repeat: 559 / 90

Advancing to step 3:
The number 90 fits into 559 6 times, leaving a remainder of 19.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 19 after subtracting 540 from 559.
Append the next digit (4) from the dividend to 19 and continue with: 194 / 90

Going ahead to step 4:
If we divide 194 by 90, we get 2 and a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 62.0
Deduct 180 from 194 and we're left with 14.
Take the next digit (2) from the dividend and append it to 14, then repeat: 142 / 90

Moving on to step 5:
142 divided by 90 is 1 with a remainder of 52.
The next digit of our result is 1. 
Result so far: 621.0
Deduct 90 from 142 and we're left with 52.
Bring next digit (3) of the dividend behind the 52 and repeat the process: 523 / 90

On to step 6:
The number 90 fits into 523 5 times, leaving a remainder of 73.
The next digit of our result is 5. 
Result so far: 6215.0
Subtract 450 from 523 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 7:
730 divided by 90 is 8 with a remainder of 10.
Use 8 as the next digit of our solution. 
Result so far: 6215.8
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.

Step 8:
90 goes into 100 1 times with a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 6215.81
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.

Step 9:
90 goes into 100 1 times with a remainder of 10.
The next digit of our result is 1. 
Result so far: 6215.811
If we take 90 away from 100, we end up 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.

In conclusion, the division gives 6215.811 with a balance of 0.001.