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What type of number is 0.\overline{6}?

Answer and explanation

Correct answer: A rational real number

The bar over 6 means that 6 repeats indefinitely: 0.666... A repeating decimal is rational because it can be expressed as a fraction. Let x = 0.666.... Then 10x = 6.666.... Subtracting the first equation from the second gives 9x = 6, so x = 6/9 = 2/3. Thus the number is rational, and every rational number is real. Option C is correct. It is not irrational because irrational decimals do not repeat in a fixed pattern. It is not a natural number, since 2/3 is not a counting number, and it is certainly not undefined.

Related tags

Real NumbersRepeating DecimalsRational NumbersNumber SystemsMathematicsClass 9 Mcq

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