How do you do a magic square?

My brother has to do a math ignment that requires him to create a 3x3 magic square. All the numbers in the boxes (left, right, up, down. diagonal) have to equal the same number (it can be any number). It has to have at least two mixed numbers ( i.e. 1 1/2), two improper fractions (i.e. 9/6), and two proper fractions (i.e. 5/6),