self Maths Puzzle

Make use of 5 0's(Zeros). Do any mathematical operation but answer should be 5

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self Other Question
Of all straight lines drawn through a point of intersection of two circles and terminated by the circumferences, the maximum is that which is parallel to the line joining the two centres---Prove it. does u wish to multiply the number for easier.
here is the simple maths tricks
if it is odd number......
number=75 then add 0 @ last so it will become 750 and divide it by 2
then the answer 375
for even number....
just divide the number by two and add 0 @ last
ex:-278 now divide it by two then it will become 136 and 0 at last then the answer is 1360.........