Example

Classifying 0.5830.58\overline{3}, 0.47, and 3.605551275ldots as Rational or Irrational

Given the numbers 0.5830.58\overline{3}, 0.47, and 3.605551275ldots, classify each as rational or irrational by inspecting its decimal form:

  • 0.5830.58\overline{3}: The digit 33 repeats endlessly, making it a repeating decimal. Therefore, it is a rational number.
  • 0.47: The decimal ends after two digits, making it a terminating decimal. Therefore, it is a rational number.
  • 3.605551275ldots: The digits continue without settling into a repeating block and do not terminate. Therefore, this number is irrational.

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Updated 2026-06-26

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