NCERT Grade 8-Rational Numbers-Answers – MySchoolPage

NCERT Grade 8-Rational Numbers-Answers

NCERT Solutions for Class 8 Maths

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1.     

2.    We know that addictive inverse of a rational number 

3.    (i) Putting  in -(-x) = x,

⇒ L.H.S. = R.H.S

Hence, verified.

(ii) Putting  in -(-x) = x,

⇒ L.H.S. = R.H.S

Hence, verified.

4.    We know that multiplicative inverse of a rational number a is 

5.     (i) 1 is the multiplicative identity.

(ii) Commutative property.

(iii) Multiplicative inverse property.

6.    The reciprocal of 

According to the question,

7.    By using associative property of multiplication, we will computes as a × (b × c) = (a × b) × c.

8.    Since multiplicative inverse of a rational number 

Therefore, 

But its product must be positive 1.

Therefore,  is not he multiplicative inverse of 

9.    Since multiplicative inverse of a rational number 

Therefore, 

Therefore, Yes 0.3 is the multiplicative inverse of

10.  (i) 0

(ii) 1 and -1

(iii) 0

11.  (i) No

(ii) 1, -1

(iii) 

(iv) x

(v) Rational number

(vi) Positive.

12.  

13.  

14.   and so on.

15.  

Here, L.C.M. of 5 and 2 is 10.

16.  

17.  Five rational numbers greater than -2 are:

                           [Other rational numbers may also be possible]

18.  

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