(i) 2 − √5 (ii) (3 + √23) − √23 (iii) 2√7 / 7√7
(iv) 1/√2 (v) 2π
Math’s NCERT Class 9 Chapter 1 Number System
Page No. 24
Exercise 1.4
Question No. 1
Classify the following numbers as rational or irrational:
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(i) 2 − √5 Irrational Number
(ii) (3 + √23) − √23 Rational Number
(iii) 2√7 / 7√7 Rational Number
(iv) 1/√2 Irrational Number
(v) 2π Irrational Number