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Which option contains only rational numbers?

Answer and explanation

Correct answer: \(0.125\), \(-4\), \(\sqrt{169}\)

Rational numbers can be written as fractions, integers, terminating decimals or repeating decimals. In option A, \(0.125\) is a terminating decimal (\(\tfrac{1}{8}\)), \(-4\) is an integer, and \(\sqrt{169}=13\) is an integer — so all are rational. A common distractor is D: \(\sqrt{18}=3\sqrt{2}\) is irrational, so D is not all rational. Exam tip: check whether a square root is of a perfect square and whether decimals terminate or repeat to decide rationality quickly.

Related tags

Rational-NumbersNumber-ClassificationReal-NumbersIrrational-NumbersClass-10Real NumbersNumber SystemsMathematics

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