Answer :

They are exactly the same number. .500 .50 is actually written as .5
When you are to the right of the decimal point, any ending zeroes are erased.
[tex]0.500 = 0.50 = 0.5[/tex]

They are all equal, since their values are all equal to five tenths, or one half. The zeros in 0.500 and 0.50, equal just that - zero. Since they equal zero, you can cross them out, which leaves you with 0.5.