Suggestion for practicing math: number concepts

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Could someone suggest some studying material for the basic number concepts, such as sets, integers, multiples, factors, prime numbers... I have no problem solving word problems that involve algebra and geometry, but when it comes to these basic concepts, I don't know where to begin. Maybe lots of practice questions would also help.

This is especially problematic for me in the data sufficiency section. ie: is x>0, 1) x^3<0, 2) (x^2)^0.5 >0 Ofcourse, the actual exam questions are a lot hard.

Thanks
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by OGMATTERS » Sat Aug 22, 2009 12:44 pm
Veritas has a great advanced number properties supplement.

Manhattan and Veritas both have well written subject specific books on number properties.
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