Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

Class 8: Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

The document Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8 is a part of the Class 8 Course Mathematics (Maths) Class 8.
All you need of Class 8 at this link: Class 8

Question 1: Multiply the reciprocal of (7/8) by the reciprocal of (-2/21)
Solution: Given two rational numbers 7/8 and -2/21

We know,
Reciprocal of (-2/21) is (-21/2)
Reciprocal of (7/8) is (8/7)
Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8
Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

Question 2: The product of two rational numbers is (-28/75). If one of the numbers is (14/25), find the other.
Solution: 
Product of two numbers = -28/75
Any one of the rational numbers = 14/25
Let the other number be R
∴ R х 14/25 = -28/75
The other number 
Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8
Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8
Thus, the required rational number is (-2/3)

Question 3: Find three rational numbers between –3 and –4.
Solution: By formula method,

a = -3 and b = -4
Therefore, the rational number b/w -3 and -4 is

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8
A rational number between (–3) and (-7/2)

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

A rational number between (-7/2) and (-4)
Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8
Thus, the three rational numbers between (–3) and (–4) are -7/2, -13/4, -15/4.

Question 4: Find three rational numbers between (1/2) and (–2)
Solution: By formula method, 

a = 1/2 and b = -2
A rational number between  (1/2) and (–2)

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

 A rational number between 1/2 and (-3/4)

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

A rational number between (-3/4) and (–2)

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8

Thus, the three rational numbers between 1/2 and -2 are -3/4, -1/8, -11/8.

The document Important Questions: Rational Numbers Notes | Study Mathematics (Maths) Class 8 - Class 8 is a part of the Class 8 Course Mathematics (Maths) Class 8.
All you need of Class 8 at this link: Class 8

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