Any Value in Memorizing Math Formulas?

Some teachers require students to memorize the formulas and some don't. Some standardized testing allow formula sheets (referred to as cheat sheets by some) and some don't. It doesn't seem to matter who you ask, the answers always vary. I've gone both ways myself depending on the concept I'm addressing. For what's it's worth, I'm sitting on the fence with this one as I think there are certain formulas worth committing to memory and others that are always available at your fingertips.

Check out what our users say about the value of memorizing (or not) formulas.

Just to clarify: once upon a time, I would only use the word formulae when referring to the plural of formula. However, with the ever evolving and changing language, both are completely acceptable according to most dictionaries.