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Which option correctly describes (1.272727...)?

Answer and explanation

Correct answer: Rational number

The direct answer is A, Rational number. A rational number is any number that can be written as \\(p/q\\), where \\(p\\) and \\(q\\) are integers and \\(q\\ne0\\). In the decimal 1.272727..., the block 27 repeats forever. Step by step, let \\(x=1.272727...\\). Multiplying by 100 gives \\(100x=127.272727...\\). Subtracting the first equation gives \\(99x=126\\), so \\(x=126/99=14/11\\), which is a ratio of integers. Therefore it is rational. Option A is correct. Option B, irrational number, is wrong because irrational decimals do not terminate and do not repeat in a fixed block; this decimal repeats. Option C, natural number, is wrong because 1.272727... is not a counting number such as 1, 2 or 3. Option D, perfect square, is wrong because a perfect square normally refers to a number such as 4, 9 or 16 obtained by squaring an integer; this number is not one of those. Exam cue: a terminating or recurring decimal is rational.

Related tags

Number-SystemsRecurring-DecimalRational-Numbers

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