MathsRational Numbers Class 8 Extra Questions and Answers Maths Chapter 1

Rational Numbers Class 8 Extra Questions and Answers Maths Chapter 1

Understanding rational numbers is important in math and everyday life. This chapter, “Rational Numbers Class 8 Extra Questions Maths Chapter 1, helps students learn about rational numbers in a clear and detailed way.

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    Rational numbers are fractions that can be positive or negative. They are used in many real-life situations, like measuring things and solving problems. By exploring the “Class 8 Extra Questions Rational Numbers,” students can see how useful and versatile rational numbers are.

    The chapter also includes “NCERT Solutions for Class 8 Maths Rational Numbers,” which are helpful resources for students to practice and improve their math skills. These solutions make it easier for students to understand and solve problems involving rational numbers.

    By covering the topic of “rational numbers class 8,” this introduction aims to give students the knowledge and skills they need to succeed in math and build a strong foundation in working with rational numbers.

    Rational Numbers Class 8 Extra Questions Maths Chapter 1

    Rational Number Class 8 Extra Questions Very Short Answer Type

    Question 1. Pick up the rational numbers from the following numbers.

    \(\frac { 6 }{ 7 }\), \(\frac { -1 }{ 2 }\), 0, \(\frac { 1 }{ 0 }\), \(\frac { 100 }{ 0 }\)

    Solution:

    Since rational numbers are in the form of \(\frac { a }{ b }\) where b ≠ 0.

    Only \(\frac { 6 }{ 7 }\), \(\frac { -1 }{ 2 }\) and 0 are the rational numbers.

    Question 2. Find the reciprocal of the following rational numbers:

    (a) \(\frac { -3 }{ 4 }\)

    (b) 0

    (c) \(\frac { 6 }{ 11 }\)

    (d) \(\frac { 5 }{ -9 }\)

    Solution:

    (a) Reciprocal of \(\frac { -3 }{ 4 }\) is \(\frac { -4 }{ 3 }\)

    (b) Reciprocal of 0, i.e. \(\frac { 1 }{ 0 }\) is not defined.

    (c) Reciprocal of \(\frac { 6 }{ 11 }\) is \(\frac { 11 }{ 6 }\)

    (d) Reciprocal of \(\frac { 5 }{ -9 }\) = \(\frac { -9 }{ 5 }\)

    Question 3. Write two such rational numbers whose multiplicative inverse is same as they are.

    Solution:

    Reciprocal of 1 = \(\frac { 1 }{ 1 }\) = 1

    Reciprocal of -1 = \(\frac { 1 }{ -1 }\) = -1

    Hence, the required rational numbers are -1 and 1.

    Question 4. What properties, the following expressions show?

    (i) \(\frac { 2 }{ 3 } +\frac { 4 }{ 5 } =\frac { 4 }{ 5 } +\frac { 2 }{ 3 }\)

    (ii) \(\frac { 1 }{ 3 } \times \frac { 2 }{ 3 } =\frac { 2 }{ 3 } \times \frac { 1 }{ 3 }\)

    Solution:

    (i) \(\frac { 2 }{ 3 } +\frac { 4 }{ 5 } =\frac { 4 }{ 5 } +\frac { 2 }{ 3 }\) shows the commutative property of addition of rational numbers.

    (ii) \(\frac { 1 }{ 3 } \times \frac { 2 }{ 3 } =\frac { 2 }{ 3 } \times \frac { 1 }{ 3 }\) shows the commutative property of multiplication of rational numbers.

    Question 5. What is the multiplicative identity of rational numbers?

    Solution: 1 is the multiplicating identity of rational numbers.

    Question 6. What is the additive identity of rational numbers?

    Solution: 0 is the additive identity of rational numbers.


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    Question 7. If a = \(\frac { 1 }{ 2 }\), b = \(\frac { 3 }{ 4 }\), verify the following:

    (i) a × b = b × a

    (ii) a + b = b + a

    Solution:
    Maths Rational Numbers Q7
     Class 8 Maths Rational Numbers Q7.1

    Question 8. Multiply \(\frac { 5 }{ 8 }\) by the reciprocal of \(\frac { -3 }{ 8 }\)

    Solution:
    Numbers Q8

    Question 9. Find a rational number between \(\frac { 1 }{ 2 }\) and \(\frac { 1 }{ 3 }\).

    Solution: Rational number between

    Also Read: NCERT Exemplar Solutions Class 8 Maths Solutions Chapter 10 Direct & Inverse Proportions

    Question 10. Write the additive inverse of the following:

    (a) \(\frac { -6 }{ 7 }\)

    (b) \(\frac { 101 }{ 213 }\)

    Solution:
     Rational Numbers Q10

    Question 11. Write any 5 rational numbers between \(\frac { -5 }{ 6 }\) and \(\frac { 7 }{ 8 }\). (NCERT Exemplar)

    Solution:
    Extra Questions for Class 8

    Question 12. Identify the rational number which is different from the other three : \(\frac { 2 }{ 3 }\), \(\frac { -4 }{ 5 }\), \(\frac { 1 }{ 2 }\), \(\frac { 1 }{ 3 }\). Explain your reasoning.

    Solution: \(\frac { -4 }{ 5 }\) is the rational number which is different from the other three, as it lies on the left side of zero while others lie on the right side of zero on the number line.

    Rational Numbers Class 8 Extra Questions Short Answer Type

    Question 13. Calculate the following:
     Numbers Q13
    Solution:
    Q13.1
    Class 8 Maths Rational Numbers Q13.2

    Question 14. Represent the following rational numbers on number lines.

    (a) \(\frac { -2 }{ 3 }\)

    (b) \(\frac { 3 }{ 4 }\)

    (c) \(\frac { 3 }{ 2 }\)

    Solution:

    Question 15. Find 7 rational numbers between \(\frac { 1 }{ 3 }\) and \(\frac { 1 }{ 2 }\).

    Solution:
    Numbers Q15

    Question 16. Show that:

    Rational Numbers Q16
    Solution:

    Extra Questions for Class 8

    Question 17. If x = \(\frac { 1 }{ 2 }\), y = \(\frac { -2 }{ 3 }\) and z = \(\frac { 1 }{ 4 }\), verify that x × (y × z) = (x × y) × z.

    Solution: We have x = \(\frac { 1 }{ 2 }\), y = \(\frac { -2 }{ 3 }\) and z = \(\frac { 1 }{ 4 }\)

    LHS = x × (y × z)
    Extra Questions for Class 8 Maths Rational Numbers Q17

    Class 8 Foundation Course

    Question 18. If the cost of 4\(\frac { 1 }{ 2 }\) litres of milk is ₹89\(\frac { 1 }{ 2 }\), find the cost of 1 litre of milk.

    Solution:
    Extra Questions for Class 8 Maths Rational Numbers Q18

    Question 19. The product of two rational numbers is \(\frac { 15 }{ 56 }\). If one of the numbers is \(\frac { -5 }{ 48 }\), find the other.

    Solution: Product of two rational numbers = \(\frac { 15 }{ 56 }\)

    One number = \(\frac { -5 }{ 48 }\)

    Other number = Product ÷ First number
    Extra Questions for Class 8 Maths Rational Numbers Q19

    Hence, the other number = \(\frac { -18 }{ 7 }\)

    Question 20. Let O, P and Z represent the numbers 0, 3 and -5 respectively on the number line. Points Q, R and S are between O and P such that OQ = QR = RS = SP. (NCERT Exemplar)

    What are the rational numbers represented by the points Q, R and S. Next choose a point T between Z and 0 so that ZT = TO. Which rational number does T represent?

    Solution:

    Extra Questions for Class 8 Maths Rational Numbers Q20
    As OQ = QR = RS = SP and OQ + QR + RS + SP = OP

    therefore Q, R and S divide OP into four equal parts.
    Extra Questions for Class 8 Maths Rational Numbers Q20.1

    Question 21. Let a, b, c be the three rational numbers where a = \(\frac { 2 }{ 3 }\), b = \(\frac { 4 }{ 5 }\) and c = \(\frac { -5 }{ 6 }\) (NCERT Exemplar)

    Verify:

    (i) a + (b + c) = (a + b) + c (Associative property of addition)

    (ii) a × (b × c) – (a × b) × c (Associative property of multiplication)

    Solution:

    Extra Questions for Class 8 Maths Rational Numbers Q21
    Extra Questions for Class 8 Maths Rational Numbers Q21.1

    Rational Numbers Class 8 Extra Questions Higher Order Thinking Skills

    Question 22. Rajni had a certain amount of money in her purse. She spent ₹ 10\(\frac { 1 }{ 4 }\) in the school canteen, bought a gift worth ₹ 25\(\frac { 3 }{ 4 }\) and gave ₹ 16\(\frac { 1 }{ 2 }\) to her friend. How much she have to begin with?

    Solution:

    Amount given to school canteen = ₹ 10\(\frac { 1 }{ 4 }\)

    Amount given to buy gift = ₹ 25\(\frac { 3 }{ 4 }\)

    Amount given to her friend = ₹ 16\(\frac { 1 }{ 2 }\)

    To begin with Rajni had

    Extra Questions for Class 8 Maths Rational Numbers Q22

    Question 23. One-third of a group of people are men. If the number of women is 200 more than the men, find the total number of people.

    Solution:

    Number of men in the group = \(\frac { 1 }{ 3 }\) of the group

    Number of women = 1 – \(\frac { 1 }{ 3 }\) = \(\frac { 2 }{ 3 }\)

    Difference between the number of men and women = \(\frac { 2 }{ 3 }\) – \(\frac { 1 }{ 3 }\) = \(\frac { 1 }{ 3 }\)

    If difference is \(\frac { 1 }{ 3 }\), then total number of people = 1

    If difference is 200, then total number of people

    = 200 ÷ \(\frac { 1 }{ 3 }\)

    = 200 × 3 = 600

    Hence, the total number of people = 600

    Question 24. Fill in the blanks:

    (a) Numbers of rational numbers between two rational numbers is ……….

    Extra Questions for Class 8 Maths Rational Numbers Q24
    Solution:

    (a) Countless

    (b) \(\frac { 6 }{ 11 }\)

    (c) \(\frac { -3 }{ 2 }\)

    (d) \(\frac { 3 }{ 5 }\)

    (e) Commutative

    (f) associative

    (g) equivalent

    (h) \(\frac { 3 }{ 11 }\)

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