# Ex 1.1, 8 - Chapter 1 Class 8 Rational Numbers

Last updated at June 22, 2018 by Teachoo

Last updated at June 22, 2018 by Teachoo

Transcript

Ex 1.1, 8 Is 8/9 " the multiplicative inverse of" –11/8? Why or why not? − 1 1/8 = (−(1 × 8 + 1))/8 = (−(8 + 1))/8 = (−9)/8 We know that, Number × Multiplicative inverse of Number = 1 ∴ We need to check if, −11/8 × 8/9 = 1 Taking L.H.S –1 1/8 × 8/9 = (−9)/8 × 8/9 = −1 ≠ 1 Hence, 8/9 is not the multiplicative inverse of −1 1/8 as product is not 1.

Ex 1.1

Ex 1.1, 1 (i)

Ex 1.1, 1 (ii)

Ex 1.1, 2 (i) Important

Ex 1.1, 2 (ii)

Ex 1.1, 2 (iii)

Ex 1.1, 2 (iv)

Ex 1.1, 2 (v)

Ex 1.1, 3

Ex 1.1, 4 (i) Important

Ex 1.1, 4 (ii)

Ex 1.1, 4 (iii)

Ex 1.1, 4 (iv)

Ex 1.1, 4 (v)

Ex 1.1, 4 (vi)

Ex 1.1, 5 Important

Ex 1.1, 6

Ex 1.1, 7

Ex 1.1, 8 You are here

Ex 1.1, 9

Ex 1.1, 10 (i) Important

Ex 1.1, 10 (ii)

Ex 1.1, 10 (iii)

Ex 1.1, 11 Important

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.