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What is the fraction form of (0.\overline{3})?

Answer and explanation

Correct answer: ( \frac{1}{3} )

The direct answer is B, \\(\frac{1}{3}\\). The bar over 3 means that 3 repeats forever: \\(0.\overline{3}=0.3333\ldots\\). Let \\(x=0.\overline{3}\\). Multiplying by 10 gives \\(10x=3.\overline{3}\\). Subtract the first equation: \\(10x-x=3.\overline{3}-0.\overline{3}\\), so \\(9x=3\\). Dividing by 9 gives \\(x=\frac{3}{9}=\frac{1}{3}\\). Option A, \\(\frac{3}{10}\\), represents 0.3 with only one 3, not an endlessly repeating 3. Option B is correct because its decimal expansion is 0.3333... . Option C, \\(\frac{3}{100}\\), represents 0.03, not 0.333... . Option D, \\(\frac{10}{3}\\), is greater than 3 and has decimal value 3.333..., so it is not the given number. Memory cue: one repeating digit can be converted by placing that digit over 9, so repeating 3 gives \\(\frac{3}{9}=\frac{1}{3}\\).

Related tags

Rational NumbersClass 9Repeating Decimal

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