The math functions work to adjust the values of 2 or more other node's effects on the material. If a vendor or EZskin has put those in they do have a purpose. For example they may just soften the effect of an SSS node ... or blend two bump effects for more natural looking skin. So, honestly, the math nodes are important. Your best bet is to go through, ask about various nodes here and we will help you sort it out. The Materials room is robust. It has a lot of important features all of which for PP 2012 helps firefly be as realistic as possible. Look up anything by bagginsbill. He is one of the masters of the nodes.

Boni

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