What are some of the helpful mathematical formulas that we should memorize for the SAT?

If you go to http://www.collegeboard.com and wander around a bit, you'll find links to help you get ready for the SAT. There's the obvious one at the right, and more in the Students section.

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I take it from the way you have worded the question you are referring to the US SAT rather than say the UK SATs (Standard Assessment Tests)? If it is the latter the BBC bitesize web site has useful material.

Thank you for using the Jiskha Homework Help Forum. Here is one more site on SAT, etc.

http://www.teacheroz.com/college.htm