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This mock test of Test: Rational Numbers- 3 for Class 8 helps you for every Class 8 entrance exam.
This contains 20 Multiple Choice Questions for Class 8 Test: Rational Numbers- 3 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

Which of the following statements is true?

Solution:

Every rational number is not a fraction. In rational numbers, we use integers and in fractions, we use only natural numbers.

QUESTION: 2

Compare

Solution:

Expressing in standard form, we get

Express each rational number with L.C.M as denominator. L.C.M of 9 and 5 is 9 × 5 = 45.

∴

Comparing the numerators, we have −40<−36 .

∴

QUESTION: 3

How is -28/84 expressed as a rational number with numerator 4?

Solution:

Given, -28/84

Dividing both the numbers by 7.

Therefore, -4/12.

QUESTION: 4

A Which of the following sets of rational numbers is arranged in ascending order?

Solution:

Convert the given fractions into equivalent fractions and then compare

-25/28 = -25/28

-5/14 = -10/28 (Multiplied both the numerator and denominator by 2)

-3/7 = -12/8 (Multiplied both the numerator and denominator by 4)

-1/2 = -14/28(Multiplied both the numerator and denominator by 14)

Therefore, option (c) is the correct answer.

QUESTION: 5

Which of the following statements is false?

Solution:

So,

Hence, both (b) and (c) are false.

QUESTION: 6

Which of the following is a rational number between 1/4 and 1/3 ?

Solution:

QUESTION: 7

Which of the following is the correct arrangement of in descending order?

Solution:

LCM of 5,10,15 and 20 which is 60. Now making the denominator same, we have . So descending order is that is

QUESTION: 8

Simplify

Solution:

LCM of 5,3 and 15 is 15

QUESTION: 9

What is the sum of the additive inverse and multiplicative inverse of 2?

Solution:

Additive inverse of 2 is −2

Multiplicative inverse of 2 is 1/2

∴ The sum of multiplicative inverse and additive inverse =

Answer :

QUESTION: 10

Subtract 2/3 from 7/8

Solution:

QUESTION: 11

Which among the following is a rational number equivalent to -5/-3 ?

Solution:

Hence the correct answer is 5/3.

QUESTION: 12

what is the Positive value of x?

Solution:

QUESTION: 13

Which number is in the middle if -1/6, 4/9, 6/-7, 2/5 and -3/4 arranged in descending order?

Solution:

The descending order is

∴ The middle number is -1/6

QUESTION: 14

What is the average of the two middle rational numbers when and are arranged in ascending order?

Solution:

Arranging the given rational numbers in ascending order, we get

The two middle rational numbers

Their average is

QUESTION: 15

Subtract -5/9 from -3/7.

Solution:

QUESTION: 16

What number should be added to -4/7 to get 5/9 ?

Solution:

**The correct answer is b**

**Let the number be x **

**Then, **

**X+(-4/7)=5/9**

**X=5/9+4/7**

**X= 35+36/63**

**X=71/63**

QUESTION: 17

What should be subtracted from -7/11 to get −2?

Solution:

Let x be subtracted from -7/11

then -7/11 - x= -2

-x= -2 + (7/11)

-x= -2 + 7/11

-x= -15/11

x= 15/11

QUESTION: 18

By what rational number should -3/5 be multiplied to obtain 21?

Solution:

QUESTION: 19

The sum of two rational numbers is −3. If one of them is -11/5, find the other.

Solution:

**The correct answer is a.**

**Let the other number be x **

**x+(-11/5)= -3**

**x= -3+11/5**

**x=-15+11/5**

**x= -4/5**

QUESTION: 20

Which of the following is the resultant of

Solution:

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