The women behind "Moebius Noodles: Adventurous Math for the Playground Crowd" are back with another fun math game they call Function Machines. I introduced Maria Droujkova and Yelena McManaman ...

This can be demonstrated using a function machine. The function, multiply by 3 and then subtract 1, can be applied to different values. If 5 is the input, the output is 14 because 5 × 3 – 1 = 14.