What is a classification system?, A way to organize information., real numbers, Set of all rational and irrational numbers., natural or counting numbers, Set of 1, 2, 3, 4, .....Does not include 0., whole numbers, Counting numbers and zero: 0, 1, 2, 3, ....., integers, Set of .... -3, -2, -1, 0, 1, 2, 3,........(whole numbers), rational number, Numbers that can be expressed as a fraction or part of a whole number. (examples: -7, 2/3, 3.75), irrational number, Numbers that cannot be expressed as a fraction or ratio of two integers. There is no finite way to express them. ( examples: √2, π, e), absolute value, A number's distance from zero., Perfect Square, An integer multiplied by itself, Square Root, The square root of a number "undoes" the square of a number, Opposite number, Numbers that are in opposite positions on the number line, Terminating Decimal, A fraction/decimal that has a finite number of decimal digits, Repeating Decimal, A fraction/decimal number that has repeating and non terminating decimal digits

Real Numbers --

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