2 Important Skills!!!: Arithmetic And Dimensional Analysis = Physical Science!

[CurryPower]

I hear that the 2 most important skills for the physical sciences above all are to do arithmetic (sc notation, division, estimation) rapidly in your head plus dimensional analysis. My question is, what books are out there to practice this. It seems pointless to do tough numerical physics problems in Halliday Resnick when its better to do easier problems that require tough computations in ur head. So yeah, what books should I use?

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[SN2ed]

Did you check out the thread a little below this one on arithmetic tricks?

http://forums.studentdoctor.net/showthread.php?t=528674