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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

17/11 - 6/11

Solution:

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:

**ANSWER :- b **

**Solution** :-** 7/8 - 2/3**

**= {(21-16)/24}**

**= 5/24**

QUESTION: 11

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

Solution:

Hence the correct answer is 5/3.

QUESTION: 12

The value of (5/4) – (8/3) is:

Solution:

5/4 – 8/3

Making the denominator equal:

[(5/4) x (3/3)] – [(8/3) x (4/4)]

= (15/12) – (32/12)

= (15 – 32)/12

= -17/12

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:

**-⅙ = -0.16**

**4/9 = 0.44**

**-6/7 = -0.85**

**⅖ = 0.40**

**-¾ = -0.75**

**Descending Order : - 4/9, 2/5, -1/6, -3/4, -6/7**

**Middle term : - -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:

(-3*9 + 5*7 )/63

8/63

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:

Let the rational no be x

-3/5 X x = 21

x = (21 X5 )/ -3

x = -35

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 1/12 + -1/3 + -1/6 + -5/7 + 3/4 + 10/7?

Solution:

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