Reddit mentions of Rapid Math Tricks & Tips: 30 Days to Number Power

Rapid Math Tricks & Tips: 30 Days to Number Power

by Edward H. Julius

I teach middle school and use many of the mental math shortcuts in this book, Arithmetricks.

If that book doesn't keep you busy enough, then move on to Rapid Math and its sequel.

If you like videos, these are effective and fun:
Mental Math Secrets - Volume 1 - done by Jason Gibson of the MathTutorDVD series. Short, sweet, and to-the-point.

Since people have already mentioned Arthur Benjamin's book, I'm going to suggest his more enjoyable video from The Great Courses, The Secrets of Mental Math. (It's expensive, but goes on sale, so watch for them.)

I've come accross these tricks before in Rapid Math Tricks & Tips. Useful stuff back in middle and high school on math team.

I only have one, it's not Algebra or even a site, but it's a good book.

• Rapid Math: tips and tricks
  
  It focuses on arithmatic, but allows you to do some of the same things that 'math geniuses' can do. Very handy, but read the other reviews so you can see what the strengths and weaknesses are. There is a sequel "More Rapid Math: tips and tricks". Starts out slow, so don't blow it off as too easy based on the first chapter or two. The best thing about it is that it will give you a good feel for numbers beyond the tricks that are taught in the book.

You know, I've had it for so long that I don't even remember where I got it from. Here is the book on Amazon, and here are a ton of cheap, used ones from Barnes and Noble, if you don't care about it being used.

I suggest you get this book: http://www.amazon.com/Rapid-Math-Tricks-Tips-Number/dp/0471575631

It has a lot of them.