This powerpoint is used to engage students before learning about functions. When you click on a number it will go to the coresponding candy. If you press the push button on the machine it will lead you to a table. The A2 button is special, if you click on the A it will lead to the Pops candy. If you click on the 2 it will lead to the Dots. (This is the non function part) You can ask the students is this a functional vending machine. They will say no because when you pressed the A2 button you got 2 different things. Explain and relate to them the definition of a math function. (Every input has exactly one output)
You can engage students even more by giving them candy like it is a real machine!
I also have a functional Vending machine