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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