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What type of number is the decimal 0.333...?

Answer and explanation

Correct answer: Rational number

0.333... is a repeating decimal, so it is a rational number. To show this, let x = 0.333...; then 10x = 3.333... and subtracting gives 9x = 3, so x = 3/9 = \(\frac{1}{3}\). Thus 0.333... can be written as a fraction and is rational. Option B (irrational) is wrong because irrational decimals are non-terminating and non-repeating. Options C and D are also incorrect: 0.333... is a real number, and every real number is either rational or irrational. Exam tip: Any terminating or repeating decimal is rational—use the multiply-and-subtract method to convert to a fraction quickly.

Related tags

Decimal-ExpansionRational-NumbersRepeating-DecimalReal-NumbersIrrational Numbers And Real NumbersPolynomialsMathematicsClass 10 Mcq

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