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1.1 Real Numbers and Number Operation SUBSETS OF THE REAL NUMBERS: Whole Numbers: 0, 1, 2, 3,… Integers: …, -3, -2, -1, 0, 1, 2, 3,… Rational Numbers: Numbers that can be written as the ratio of two integers. As decimals they terminate or repeat. Ex: ¾ = 0.75 and 1/3 = 0.333… Irrational Numbers: Real numbers that are not rational. When written as decimals, irrational numbers neither terminate nor repeat. 1.2 Algebraic Expressions and Models Please Excuse My Dear Aunt Sally PE MD AS Parenthesis Exponent Multiplication and Division in the order that it appears from left to right. Addition and Subtraction in the order that it appears from left to right.