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Which number is an irrational number?

Answer and explanation

Correct answer: (\sqrt{2})

Direct answer: Option A, \(\sqrt{2}\) is irrational. A rational number can be written as \(p/q\), where p and q are integers and \(q\ne0\). Fractions, integers, terminating decimals and repeating decimals are rational. The number \(\sqrt2\) cannot be expressed as such a fraction; 2 is not a perfect square, so its square root is irrational. Option A is correct. Option B, \(3/4\), is already a ratio of integers, so it is rational. Option C, 0.5, terminates and equals \(1/2\), so it is rational. Option D, 7, is an integer and can be written as \(7/1\), so it is rational. Do not confuse an irrational number with a non-real number: \(\sqrt2\) is real, just not rational. Memory cue: the square root of a positive non-perfect square is irrational.

Related tags

Irrational-NumbersReal-NumbersClassification

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