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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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Class 8 Maths
Class 8 Science
