Which square root is not irrational?
Answer and explanation
Correct answer: \(\sqrt{64}\)
\(64\) is a perfect square, and \(\sqrt{64}=8\), which is a rational number. Therefore, \(\sqrt{64}\) is not irrational. In contrast, 31, 40, and 72 are not perfect squares, so their square roots are irrational. Exam tip: The square root of a perfect square is always rational.
Frequently asked questions
What is the correct answer to this question?
\(\sqrt{64}\)
Why is this the correct answer?
\(64\) is a perfect square, and \(\sqrt{64}=8\), which is a rational number. Therefore, \(\sqrt{64}\) is not irrational. In contrast, 31, 40, and 72 are not perfect squares, so their square roots are irrational. Exam tip: The square root of a perfect square is always rational.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems. Topic: Irrational numbers.
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