Formulas and functions are among what Excel does best, and the most commonly used aspect of the program that is in use on 750 million desktops, but with as many as 455 functions users can get easily overwhelmed, which is why this tip card was created to be as easy to use as possible. From SUM and AVERAGE to VLOOKUP and SUMPRODUCT, this card illustrates the most important functions and groups them into helpful subject matters that include rounding, lookup, text handling, and condition. It uses an illustrative approach to its lessons, and instead of merely stating tips will present a problem and the formula needed to solve the problem.