Yes, we can verify using subtraction:
If we subtract 5 from 5.5 and the result is positive we can conclude 5.5 is greater than 5, if the result is negative, we can conclude 5.5 is less than 5, so:
Since 0.5 > 0, the result is positive, therefore 5.5 is greater than 5. Therefore Ella will get a bag.