Question

Hlo everyone. I want Rational number Class 8th maths extra questions not from the ncert book. Anybody have so please help me.​

Answer 1

Answer:

1,2,3 4,5 ,6,7, and all natural numbers are rational number

Answer 2

Answer:

Question 1.

Pick up the rational numbers from the following numbers.

67, −12, 0, 10, 1000

Question 2.

Find the reciprocal of the following rational numbers:

(a) −34

(b) 0

(c) 611

(d) 5−9

Solution:

(a) Reciprocal of −34 is −43

(b) Reciprocal of 0, i.e. 10 is not defined.

(c) Reciprocal of 611 is 116

(d) Reciprocal of 5−9 = −95

Question 3.

Write two such rational numbers whose multiplicative inverse is same as they are.

Solution:

Reciprocal of 1 = 11 = 1

Reciprocal of -1 = 1−1 = -1

Hence, the required rational numbers are -1 and 1.

 

Question 4.

What properties, the following expressions show?

(i) 23+45=45+23

(ii) 13×23=23×13

Solution:

(i) 23+45=45+23 shows the commutative property of addition of rational numbers.

(ii) 13×23=23×13 shows the commutative property of multiplication of rational numbers.

 

Question 5.

What is the multiplicative identity of rational numbers?

Solution:

1 is the multiplicating identity of rational numbers.

Question 6.

What is the additive identity of rational numbers?

Question 7.

If a = 12, b = 34, verify the following:

(i) a × b = b × a

(ii) a + b = b + a

Question 8.

Multiply 58 by the reciprocal of −38

Question 9.

Find a rational number between 12 and 13.

 

Question 10.

Write the additive inverse of the following:

(a) −67

(b) 102

You can find the answers by yourself.