We divide 509520 by 99
We're looking to find how many times 99 goes into 509520.

Step 1:
99 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 99

Step 2:
The number 99 fits into 50 0 times, leaving a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 50 after subtracting 0 from 50.
Append the next digit (9) from the dividend to 50 and continue with: 509 / 99

On to step 3:
99 goes into 509 5 times with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 495 from 509 and we're left with 14.
Include the next digit (5) from the dividend after 14, then repeat: 145 / 99

Moving on to step 4:
The number 99 fits into 145 1 times, leaving a remainder of 46.
Write down 1 as next digit of the result. 
Result so far: 51.0
Subtract 99 from 145 to get 46.
Include the next digit (2) from the dividend after 46, then repeat: 462 / 99

Step 5:
462 divided by 99 is 4 with a remainder of 66.
The next digit of our result is 4. 
Result so far: 514.0
Deduct 396 from 462 and we're left with 66.
Bring next digit (0) of the dividend behind the 66 and repeat the process: 660 / 99

Advancing to step 6:
660 divided by 99 is 6 with a remainder of 66.
Use 6 as the next digit of our solution. 
Result so far: 5146.0
The remainder is 66 after subtracting 594 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 7:
When dividing 660 by 99, we get 6 with a remainder of 66.
Put 6 as the next digit of the answer. 
Result so far: 5146.6
If we subtract 594 from 660, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 8:
99 goes into 660 6 times with a remainder of 66.
The number 6 becomes the next digit in our result. 
Result so far: 5146.66
Deduct 594 from 660 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final outcome is 5146.66, with a leftover of 0.066.