Olympiad Test: Rational Numbers -1


20 Questions MCQ Test Mathematical Olympiad Class 8 | Olympiad Test: Rational Numbers -1


Description
This mock test of Olympiad Test: Rational Numbers -1 for Class 8 helps you for every Class 8 entrance exam. This contains 20 Multiple Choice Questions for Class 8 Olympiad Test: Rational Numbers -1 (mcq) to study with solutions a complete question bank. The solved questions answers in this Olympiad Test: Rational Numbers -1 quiz give you a good mix of easy questions and tough questions. Class 8 students definitely take this Olympiad Test: Rational Numbers -1 exercise for a better result in the exam. You can find other Olympiad Test: Rational Numbers -1 extra questions, long questions & short questions for Class 8 on EduRev as well by searching above.
QUESTION: 1

If 3/5 of a number exceeds its 2/7 by 44, then what is the number?

Solution:

Let the number be x.

QUESTION: 2

A bus is moving at an average speed of  km/hr. How much distance it will cover inhour?

Solution:

Distance = Speed × Time

QUESTION: 3

The sum of two numbers is -4/3 If one of them is –5  then what is the other number?

Solution:
QUESTION: 4

In a school 5/8 of the students are boys. If the number of girls are 270. What is the number of boys in the school?

Solution:

No. of girls = 1 - 5/8 = 3/8
Let x be the total no. of students then

x = 720
No. of boys = 720 - 270 = 450

QUESTION: 5

A cord of lengthm has been cut into 26 pieces of equal length. What is the length of each piece?

Solution:

Length of each piece 
                                 

QUESTION: 6

The product of two numbers is -16/75 . If one of the number is -15/14 what is the other number?

Solution:

Let the number be x.

QUESTION: 7

What should be subtracted from -5/3  to get 5/6 ?

Solution:
QUESTION: 8

What is additive inverse of -7/9?

Solution:

If x is the additive inverse then 
x = 7/9

QUESTION: 9

The sum of two rational numbers is – 3. If one of the number is -10/3. What is the other number?

Solution:

QUESTION: 10

The cost of metres of cloth is .  What is the cost of one metre of cloth?

Solution:

Cost of one metre of cloth = 

QUESTION: 11

​By what number should -33/8 be divided to get -11/2 ?

Solution:


=>  x= 3/4

QUESTION: 12

By what rational number should we multiplying -16/63 - to get -4/7.

Solution:

QUESTION: 13

What number should be added to -7/8 to get 4/9 ?​

Solution:


x = 95/72

QUESTION: 14

What is reciprocal of ?​

Solution:

We have 
∴    Reciprocal of 

QUESTION: 15

Which rational number is in between -2/3 and -1/4?

Solution:

ANSWER :- d

Solution :- If a and b are two Rational numbers then a rational number between them is ( a + b )/2

Rational number between -2/3 and -1/4 = [ (-2/3) + (-1/4)]/2

= [ ( -8 - 3 )/12]/2

= [(-11)/12]/2

= -11/24

QUESTION: 16

What is the reciprocal of ?

Solution:


 

QUESTION: 17

What should be added to -3/5 to get -1/3?

Solution:

Let x should be added.

QUESTION: 18

What is the additive inverse of  ?

Solution:


Additive inverse of 17/60 is -17/60.

QUESTION: 19

What is the value of 3/4 ÷ 5/8 x 3/7 + 2/9 - 1/3 ?

Solution:

QUESTION: 20

What is the value of 

Solution:

Here