How do you get the number 50 by making an equation using the numbers 2 0 0 and 9?

There are several ways: * .5 x (91+9) = .5(100) = 50. * [(1+9)! / 9!] x 5 = 10 x 5 = 50 * 51 - 9/9 = 51 - 1 = 50 The first and last methods are of course only valid if the numbers are allowed to be taken as digits, rather than specific numerical values.