# Classify the Numbers  Sqrt (21) as Rational Or Irrational: - Mathematics

Classify the numbers  sqrt (21) as rational or irrational:

#### Solution

 sqrt (21 ) = sqrt (3) xx sqrt (7) is an irrational number because √3 and √7 are irrational and prime numbers.

Concept: Concept of Irrational Numbers
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#### APPEARS IN

RS Aggarwal Secondary School Class 10 Maths
Chapter 1 Real Numbers
Q 2.09