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What type of number is 0.̅12?

Answer and explanation

Correct answer: Rational real number

The bar over 12 means that the two-digit block repeats indefinitely, so the decimal is 0.12121212… This is a recurring decimal, and every recurring decimal can be expressed as a ratio of two integers. For an algebraic verification, let x = 0.121212…. Multiplying by 100 gives 100x = 12.121212…. Subtracting the first equation from the second removes the repeating decimal part: 99x = 12. Therefore x = 12/99 = 4/33. Since 4/33 is a quotient of integers with a nonzero denominator, the number is rational. Every rational number is real, so option B is correct. It is not an integer because its value is between 0 and 1.

Related tags

Decimal RepresentationRepeating DecimalsRational NumbersNumber SystemsMathematicsClass 9 Mcq

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