The magician introduces four wooden math sticks used in elementary schools to teach arithmetic. Each stick has four sides with four digits running in a column down each side. The spectator arranges the sticks in any order and calculates the sum.  Before they can punch in the first set of numbers into a calculator or write anything down, the magician, like a superhuman computer, predicts the sum or calls it aloud!

This can be repeated many times with a different result. 

Great version of an old effect. Very easy to learn. Even if you are not usually good with math.