Join Date: Aug 2004
Location: Eastern Washington
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We have used Art of Problem Solving for PreAlgebra and most of Algebra. Then, my dd was too overwhelmed by it and we changed things up. I am not familiar with the Key to series, but I can honestly say that I have never seen a math program as challenging as Art of Problem Solving. I have always been skilled at math. I went through several levels of calculus, theory classes, etc at the college level before I finished. That said, the Algebra was fun (but still challenging) for me. It was intimidating for my daughter and she needed a lot of hand holding. Amazingly, the math program we switched to isn't considered weak at all, but my dd doesn't even need me there.
I tell you this background so that you understand my recommendation. I would have your daughter begin in Introductory Algebra. It should start out familiar, but even so, there will be challenging problems. When you read the chapter titles, you will think, "no problem." Believe me, this group of people are great at writing solid, challenging texts that are fantastic for math enthusiasts.
ETA: just realized that you didn't want to do Algebra or Geometry. In that case, I would either pick any other "introductory" book or I would use the first volume of their contest prep. books. However, when I looked up the "Key to" series, you will not have finished Algebra 1 until she does all ten books--actually, I am not sure that all ten even cover all of Algebra 1. Also, their geometry series says that by finishing it, you will be ready for formal geometry. I don't think your daughter would be repeating much by using the Art of Problem Solving books for those topics.
Mom to three very active girls Anna (15), Kayla (12), Maya (9).