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Pre-Algebra is a common name for a course in middle school mathematics. In the United States, pre-algebra is usually taught in the 7th grade.〔In the ''Introduction'' to their book on pre-algebra, say that "the math in this book should match what's taught in many middle school classrooms in California, Florida, New York, Texas, and other states". (p. xix)〕 The objective of pre-algebra is to prepare the student for the study of algebra. Pre-algebra includes several broad subjects: * Review of natural number arithmetic * New types of numbers such as integers, fractions, decimals and negative numbers * Factorization of natural numbers * Properties of operations such as associativity and distributivity * Simple (integer) roots and powers * Rules of evaluation of expressions, such as operator precedence and use of parentheses * Basics of equations, including rules for invariant manipulation of equations * Understanding of variable manipulation * Manipulation and arithmetic with the standard 4-quadrant Cartesian coordinate plane Pre-algebra may include subjects from geometry, especially subjects that further understanding of algebra in applications to area and volume. ==Notes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pre-algebra」の詳細全文を読む スポンサード リンク
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