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In this page we have Important questions for rational Numbers Class 8 CBSE
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Question 1
Write the additive inverse of each of the following:
 1
 1/9
 2/3
 2
 9/1
Answer
(i) 1
Additive inverse = 1
(ii) 1/9
Additive inverse = 1/9
(iii) 2/3
Additive inverse = 2/3
(iv) 2
Additive inverse =2
(v) 9/=9
Additive inverse =9
Question 2
What is the additive identity?
 1
 1
 0
 None of the above
Answer 0
Question 3
True or False Statement
 The difference of two rational number is a rational number
 Addition of rational numbers is associative
 Addition of rational numbers is commutative
 Subtraction of rational numbers is not commutative
 The addition or subtraction of two rational number is a rational number
Answer
All the statement are true
Question 4
Find the multiplicative inverse of the following.
 11/12
 10/9
 1/2
 5/2 X 2/5
 1/2 X 2/5
  4
Answer
 11/12
Multiplicative inverse =12/11
 10/9
Multiplicative inverse =9/10
 1/2
Multiplicative inverse =2
 5/2 X 2/5 =1
Multiplicative inverse =1
 1/2 X 2/5 =1/5
Multiplicative inverse =5

1
Multiplicative inverse =1/4
Question 5
Which of these properties hold false for Multiplication of rational numbers?
 Associative law
 Closure law
 Commutative law
 Existence of Multiplicative identity
 None of the these
Answer
None of these
Question 6
Find the below multiplication
 (1/2) X (9/10)
 ( 25/9) X ( 1/3)
 (7/24) X 10
Answer
 (1/2) X (9/10)
= 1 X 9/2 X 10 = 9/20
2. ( 25/9) X ( 1/3)
= (25/9) X (1/3)
= 25 X 1/9 X 3= 25/27
3. (7/24)X 10
=7X10/24=70/24
Question 7
Find the following
 (1/2)^{1}
 (3)^{1}
 (6)^{1}
 (1/2)^{1}
Answer
 Multiplicative inverse of (1/2) =2
 Multiplicative inverse of (3) =1/3
 Multiplicative inverse of (6) =1/6
 Multiplicative inverse of (1/2) =2
Question 8
The product of two rational number is 2 , if one of the rational number is 1/7 ,what is the value of other?
Answer:
Let a be the other number, then
a X (1/7) =2
Or
a = 2 ÷ (1/7)
a=2X7=14
Question 11
Fill in the blanks
(i) ____ ÷ (3)= (4/15)
(ii) The numbers __________ and __________ are their own reciprocals
(iii) The reciprocal of 1 is __________.
(iv) (1/2) ÷ (2/3) =__________.
(v) The product of two rational numbers is always a __________.
(vi) The reciprocal of a negative rational number is __________.
Answer:
 4/5
 1 and 1
 1
 3
 Rational Number
 Negative rational number
Question 12
Write five rational numbers which are smaller than 5
Answer:
0,1,2,3,4
Question 13
Find five rational numbers between (1) and 2
Answer:
We can write as
1 = 10/10
2= 20/10
So five rational numbers will be
11/10, 12/10, 13/10,14/10,15/10
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