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What type of real number is (0.125)?

Answer and explanation

Correct answer: Rational number

The direct answer is B, rational number. A rational number is any number that can be written as \\(p/q\\), where \\(p\\) and \\(q\\) are integers and \\(q\\neq0\\). The decimal 0.125 has three digits after the decimal point, so write it as \\(125/1000\\). Simplifying by dividing numerator and denominator by 125 gives \\(1/8\\). Thus it can be expressed as a ratio of integers and is rational. Option A, irrational number, is wrong because an irrational decimal does not terminate and cannot be written as such a fraction; 0.125 terminates. Option B is correct. Option C, undefined number, is wrong because 0.125 has a clear finite value. Option D, only integer, is wrong because integers have no fractional part, while \\(0.125=1/8\\) is not an integer. The exam cue is that every terminating decimal is rational; repeating decimals are rational too. The supplied answer is correct.

Related tags

Real NumbersTerminating DecimalRational

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