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What type of number is \(\sqrt{5}\times\sqrt{20}\)?

Answer and explanation

Correct answer: Rational real number

\(\sqrt{5}\times\sqrt{20}=\sqrt{5\times20}=\sqrt{100}=10\). The number 10 is an integer and a natural number, so it is also a rational real number. Therefore, option A is correct. It is not irrational because the product simplifies to a whole number. Exam tip: For positive radicands, use \(\sqrt{a}\times\sqrt{b}=\sqrt{ab}\), then check whether the resulting square root is a perfect square.

Related tags

Real NumbersSurdsRational NumbersNumber ClassificationNumber SystemsMathematicsClass 9 Mcq

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