# Determining if a Number is Rational or Irrational

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Lesson Description:

Students learn that the following number sets represent rational numbers: natural numbers, whole numbers, integers, fractions, terminating decimals, and repeating decimals. For example, -2, 7, 3/4, 0.0006, and 0.191919... are all rational numbers. However, a decimal that is both non-terminating and non-repeating is an irrational number. For example, 0.12579835781... and 39.779778776775... are irrational numbers.