Rational and Irrational Numbers

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A rational number is a number that can be written as a ratio.

  • The number 8 is a rational number because it can be written as the fraction 8/1.

All numbers that are not rational are considered irrational. An irrational number can be written as a decimal, but not as a fraction. An irrational number has endless non-repeating digits to the right of the decimal point.

  • π = 3.141592…
  • square root of 2 = 1.414213…

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