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Few people understand why a negative number multiplied by a negative number is a positive number. This book explains the reason for this rule and many of the other fundamental math rules that students learn in school so that they can confidently do their calculations with real understanding. The book's intended audience is students in their last couple of years of high school. - Schenk's writing is clear, and his examples are accurate and easy to understand. Reading the text, one is almost able to smell the chalk dust of the classroom. - ForeWord Clarion Reviews. Read more ISBN10 098101190X ISBN13 978-0981011905 Language English Publisher Alpine Publishing Dimensions 6 x 0.38 x 9 inches Item Weight 8.2 ounces Print length 150 pages Publication date August 11, 2008