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Unit 1: Value and Magnitude of Rational Numbers TEKS: 8.2A(S) extend previous knowledge of sets and subsets using a visual representation to describe relationships between sets of real numbers (irrational numbers are introduced in Unit 8) 8.2D(R) order a set of real numbers arising from mathematical and real-world contexts 8.2C(S) convert between standard decimal notation and scientific notation (irrational numbers are introduced in Unit 8) Vocabulary Base: the number in an expression or equation which is raised to a power or exponent Counting (natural) numbers: the set of positive numbers that begins at one and increases by increments of one each time {1, 2, 3, âŚ, n} â how you naturally count E: a symbol used in a calculator to indicate that the preceding number should be multiplied by ten raised to the number that follows Integers: the set of counting (natural) numbers and their opposites {-n, -3, -2, -1, 0, 1, 2, 3, âŚ, n} Powers: denoted by a number or variable in the superscript place of the base which designates how many times the base will be multiplied by itself if it is positive, or by its inverse if it is negative đ Rational numbers: the set of numbers that can be expressed as a fraction đ, where a and b are integers and b â 0; includes subsets of integers, whole numbers, and counting numbers. Scientific notation: a representation of a number by using a method to write very large or very small numbers using powers of ten that is written as a decimal with exactly one nonzero digit to the left of the decimal point multiplied by a power of ten Whole numbers: the set of counting (natural) numbers and zero {0, 1, 2, 3, âŚn}