## NCERT Exemplar Class 7 Maths Book PDF Download Chapter 8 Rational Numbers Solutions

**Multiple Choice Questions (MCQs)**

**Question 1:
**A rational number is defined as a number that can be expressed in the form p/q, where p and q are integers and

(a) q = 0 (b) q = 1

(c) q ≠ 1 (d) q ≠ 0

**Solution :**

(d) By definition, a number that can be expressed in the form of p/q, where p and q are integers and q≠0, is called a rational number.

**Question 2:
**Which of the following rational numbers is positive?

**Solution :**

(c) We know that, when numerator and denominator of a rational number, both are negative,

it is a positive rational number.

Hence, among the given rational numbers \(\left( \frac { -3 }{ -4 }\right)\) is positive.

**Question 3:
**Which of the following rational numbers is negative?

**Solution :**

**Question 4:
**In the standard form of a rational number, the common factor of numerator and denominator is always

(a) 0 (b) 1 c) -2 (d)2

**Solution :**

(b) By definition, in the standard form of a rational number, the common factor of numerator and denominator is always1

**Note:**Common factor means, a number which divides both the given two numbers.

**Question 5:
**Which of the following rational numbers is equal to its reciprocal?

(a) 1 (b) 2 c) 1/2 (d)0

**Solution :**

**Question 6:
**The reciprocal of 1/2 is

(a) 3 (b) 2 c) -1 (d)0

**Solution :**

(b) Reciprocal of \(\frac { 1 }{ 2 } =\frac { 1 }{ \frac { 1 }{ 2 } } \) =2

**Question 7:
**The standard form of \(\frac { -48 }{ 60 }\) is

**Solution :**

**Question 8:
**Which of the following is equivalent to 4/5 ?

**Solution :**

**Note:** If the numerator and denominator of a rational number is multiplied/divided by a non-zero integer, then the result we get, is equivalent rational number.

**Question 9:
**How many rational numbers are there between two rational numbers?

(a) 1 (b) 0

(c) unlimited (d) 100

**Solution :**

(c) There are unlimited numbers between two rational numbers.

**Question 10:
**In the standard form of a rational number, the denominator is always a

(a) 0 (b) negative integer

(c) positive integer (d) 1

**Solution :**

(c) By definition, a rational number is said to be in the standard form, if its denominator is a positive integer.

**Question 11:
**To reduce a rational number to its standard form, we divide its numerator and denominator by their

(a) LCM (b) HCF

(c) product (d) multiple

**Solution :**

(b) To reduce a rational number to its standard form, we divide its numerator and denominator by their HCF.

**Question 12:
**Which is greater number in the following?

(a) –\(\frac { 1 }{ 2 }\) (b) 0 (c) \(\frac { 1 }{ 2 }\) (d)-2

**Solution :**

**Fill in the Blanks**

In questions 13 to 46, fill in the blanks to make the statements true.

**Question 13:
**\(\frac { -3 }{ 8 }\) is a rational number

**Solution :**

The given rational number \(\frac { -3 }{ 8 }\) is a negative number, because its numerator is negative integer.

Hence, \(\frac { -3 }{ 8 }\) is a negative rational number.

**Question 14:
**is a____rational number.

**Solution :**

The given rational number 1 is positive number, because its numerator and denominator are positive integer.

Hence, 1 is a

**positive**rational number.

**Question 15:
**The standard form of \(\frac { -8 }{ 36 }\) is______ .

**Solution :**

**Question 16:
**The standard form of \(\frac { 18 }{ -24}\) is______ .

**Solution :**

**Question 17:
**On a number line, \(\frac { -1 }{ 2 }\) is to the______of Zero(0).

**Solution :**

**All the negative numbers lie on the left side of zero on the number line**

*Note***Question 18:
**On a number line, \(\frac { 3}{ 4}\) is to the______of Zero(0).

**Solution :**

On a number line, \(\frac { 3 }{ 4 }\) is to the

**right**of Zero(0).

**Note**All the positive numbers lie on the right side of zero on the number line.

**Question 19:
**\(\frac { -1 }{ 2 }\) is _____ than \(\frac { 1 }{ 5 }\).

**Solution :**

**Question 20:
**\(\frac { -3 }{ 5 }\) is _____ than 0.

**Solution :**

**Question 21:
**\(\frac { -16 }{ 24 }\) and \(\frac { 20 }{ -16 }\) represent_______ rational numbers.

**Solution :**

**Question 22:
**\(\frac { -27 }{ 45 }\) and \(\frac { -3 }{ 5 }\) represent_______ rational numbers.

**Solution :**

**Question 23:
**Additive inverse of \(\frac { 2 }{ 3 }\) is_____.

**Solution :**

Since, additive inverse is the negative of a number.

Hence, additive inverse of \(\frac { 2 }{ 3 }\) is \(\frac { -2 }{ 3 }\).

**Note**Additive inverse is a number, which when added to a given number, we get result as zero.

**Question 24:
**\(\frac { -3 }{ 5 }\) + \(\frac { 2 }{ 5 }\) = _____.

**Solution :**

**Question 25:
**\(\frac { -5 }{ 6 }\) + \(\frac { -1 }{ 6 }\) = ______.

**Solution :**

**Question 26:
**\(\frac { 3 }{ 4 }\times \left( \frac { -2 }{ 3 }\right) \) = _____.

**Solution :**

**Question 27:
**\(\frac { -5 }{ 3 }\times \left( \frac { -3 }{ 5 }\right) \) = _____.

**Solution :**

**Question 28:
**Given, \(\frac { -6 }{ 7 } =\bar { 42 }\)

**Solution :**

**Question 29:
**\(\frac { 1 }{ 2 }\) = \(\frac { 6 }{ – }\)

**Solution :**

**Question 30:
**\(\frac { -2 }{ 9 }\) – \(\frac { 7 }{ 9 }\) = _____

**Solution :**

**In questions 31 to 35, fill in the boxes with the correct symbol ‘<‘,'<‘ or ‘=’.**

**Question 31:
**\(\frac { 7 }{ -8 } \Box \frac { 8 }{ 9 }\)

**Solution :**

**Question 32:
**\(\frac { 3 }{ 7 } \Box \frac { -5 }{ 6 }\)

**Solution :**

**Question 33:
**\(\frac { 5 }{ 6 } \Box \frac { 4 }{ 8 }\)

**Solution :**

**Question 34:
**\(\frac { -9 }{ 7 } <\frac { 4 }{ -7 }\)

**Solution :**

**Question 35:
**\(\frac { 8 }{ 8 } \Box \frac { 2 }{ 2 }\)

**Solution :**

**Question 36:
**The reciprocal of_______ does not exist.

**Solution :**

The reciprocal of zero does not exist, as reciprocal of 0 is 1/0, which is not defined.

**Question 37:
**The reciprocal of 1 is_______

**Solution :**

The reciprocal of 1=1/1

Hence, the reciprocal of 1 is 1.

**Question 38:
**\(\frac { -3 }{ 7 } \div \left( \frac { -7 }{ 3 }\right)\) =________

**Solution :**

**Question 39:
**\(0\div \left( \frac { -5 }{ 6 }\right)\) =_________

**Solution :**

**Question 40:
**\(0\times \left( \frac { -5 }{ 6 }\right) \) =_________

**Solution :**

Hence,\(0\times \left( \frac { -5 }{ 6 }\right) \) =0

Because, zero multiplies by any number result is zero.

**Question 41:
**_____ x \(\left( \frac { -2 }{ 5 }\right) \) =1

**Solution :**

**Question 42:
**The standard form of rational number – 1 is_______.

**Solution :**

∴ HCF of given rational number -1 is 1.

For standard form = -1 +1 = -1

Hence, the standard form of rational number -1 is -1.

**Question 43:
** If m is a common divisor of a and b, then \(\frac { a }{ b } =\frac { a+m }{ – }\)

**Solution :**

**Question 44:
**If p and q are positive integers, then \(\frac { p }{ q }\) is a______ rational number and \(\frac { p }{ -q }\) is a_____ rational number.

**Solution :**

if p and q are positive integers, then p/q is a

**positive**rational number, because both numerator and denominator are positive and \(\frac { p }{ -q }\) is a

**negative**rational number, because denominator is in negative

**Question 45:
**Two rational numbers are said to be equivalent or equal, if they have the same_______form.

**Solution :**

Two rational numbers are said to be equivalent or equal, if they have the same

**simplest**form.

**Question 46:
**If p/q is a rational number, then q cannot be_____________

**Solution :**

By definition, if B is a rational number, then q cannot be

**zero**.

**True/False**

In questions 47 to 65, state whether the following statements are True or False.

**Question 47:
**Every natural number is a rational number, but every rational number need not be a natural number.

**Solution :**

**True**

e.g. 1/2 is a rational number, but not a natural number.

**Question 48:
**Zero is a rational number.

**Solution :**

**True**

e.g. Zero can be written as 0 = 0/1. We know that, a number of the form \(\frac { p }{ q }\), where p, q are integers and q ≠ 0 is a rational number. So, zero is a rational number.

**Question 49:
**Every integer is a rational number but every rational number need not be an integer.

**Solution :**

**True**

Integers…. – 3,-2,-1, 0,1,2, 3,…

Rational numbers:

\(1,\frac { -1 }{ 2 } ,0,\frac { 1 }{ 2 } 1,\frac { 3 }{ 2 } ,\)……

Hence, every integer is rational number, but every rational number is not an integer.

**Question 50:
**Every negative integer is not a negative rational number.

**Solution :**

**False**

Because all the integers are rational numbers, whether it is negative/positive but vice-versa is not true.

**Question 51:
**If \(\frac { p }{ q }\) is a rational number and m is a non-zero integer, then

\(\frac { p }{ q } =\frac { p\times m }{ q\times m }\)

**Solution :**

**True**

e.g. Let m = 1,2, 3,…

*Note:**When both*numerator and denominator of a rational number are multiplied/divide by a same non-zero number, then we get the same rational number

**Question 52:
**If \(\frac { p }{ q }\) is a rational number and m is a non-zero common divisor of p and q, then

\(\frac { p }{ q } =\frac { p\div m }{ q\div m }\)

**Solution :**

**Question 53:
**In a rational number, denominator always has to be a non-zero integer.

**Solution :**

Basic definition of the rational number is that, it is in the form of \(\frac { p }{ q }\), where q ≠ 0. It is because any number divided by zero is not defined.

**Question 54:
**If \(\frac { p }{ q }\) is a rational number and m is a non-zero integer, then \(\frac { p\times m }{ q\times m }\) is a rational number not equivalent to \(\frac { p }{ q }\).

**Solution :**

**Question 55:
**Sum of two rational numbers is always a rational number.

**Solution :**

**True**

Sum of two rational numbers is always a rational number, it is true.

\(\frac { 1 }{ 2 } +\frac { 2 }{ 3 } =\frac { 3+4 }{ 6 } =\frac { 7 }{ 6 }\)

**Question 56:
**All decimal numbers are also rational numbers.

**Solution**

**True**

All decimal numbers are also rational numbers, it is true.

\(0.6=\frac { 6 }{ 10 } =\frac { 3 }{ 5 }\)

**Question 57:
**The quotient of two rationals is always a rational number.

**Solution :**

**False**

The quotient of two rationals is not always a rational number.

e.g. 1/0.

**Question 58:
**Every fraction is a rational number.

**Solution :**

**True**

Every fraction is a rational number but vice-versa is not true.

**Question 59:
**Two rationals with different numerators can never be equal.

**Solution :**

**False**

**Question 60:
**8 can be written as a rational number with any integer as denominator.

**Solution :**

8 can be written as a rational number with any integer as denominator, it is false because 8 can be written as a rational number with 1 as denominator i.e.8/1.

**Question 61:
**\(\frac { 4 }{ 6 }\) is equivalent to \(\frac { 2 }{ 3 }\)

**Solution :**

**True**

**Question 62:
**The rational number \(\frac { -3 }{ 4 }\) lies to the right of zero on the number line.

**Solution :**

**False**

**Question 63:
**The rational number\(\frac { -12 }{ 15 }\) and \(\frac { -7 }{ 17 }\) are on the opposite sides of zero on the number line.

**Solution :**

**Question 64:
**Every rational number is a whole number.

**Solution :**

**False**

e.g. \(\frac { -7 }{ 8 }\) is a rational number, but it is not a whole number, because whole numbers are 0,1,2….

**Question 65:
**Zero is the smallest rational number.

**Solution :**

**False**

Rational numbers can be negative and negative rational numbers are smaller than zero.

**Question 66:
**Match the following:

**Solution :**

**Question 67:
**Write each of the following rational numbers with positive denominators.

\(\frac { 5 }{ -8 } ,+\frac { 15 }{ 28 } \frac { -17 }{ 13 }\)

**Solution :**

**Question 68:
**Express \(\frac { 3 }{ 4 }\) as a rational number with denominator:

(a)36 (b) — 80

**Solution :**

**Question 69:
**Reduce each of the following rational numbers in its lowest form

(i) \(\frac {- 60 }{ 72 }\)

(ii) \(\frac {91 }{ -364 }\)

**Solution :**

**Question 70:
**Express each of the following rational numbers in its standard form

**Solution :**

**Question 71:
**Are the rational numbers \(\frac {-8 }{ 28 }\) and \(\frac {32 }{ -12 }\) equivalent? Give reason.

**Solution :**

**Question 72:
**Arrange the rational numbers \(\frac { -7 }{ 10 } ,\frac { 5 }{ -8 } ,\frac { 2 }{ -3 } ,\frac { -1 }{ 4 } ,\frac { -3 }{ 5 }\) in ascending order.

**Solution :**

**Question 73:
**Represent the following rational numbers on a number line.

\(\frac { 3 }{ 8 } ,\frac { -7 }{ 3 } ,\frac { 22 }{ -6 }\)

**Solution :**

**Question 74:
**If \(\frac { -5 }{ 7 }\) = \(\frac {\times }{ 28 }\) find the value of x.

**Solution :**

**Question 75:
**Give three rational numbers equivalent to

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

(ii) \(\frac { 7 }{ 11 }\)

**Solution :**

**Question 76:
**Write the next three rational numbers to complete the pattern:

**Solution :**

**Question 77:
**List four rational numbers between \(\frac { 5 }{ 7 }\) and \(\frac { 7 }{ 8 }\).

**Solution :**

**Question 78:
**Find the sum of

**Solution :**

**Question 79:
**Solve:

**Solution :**

**Question 80:
**Find the product of

**Solution :**

**Question 81:
**Simplify:

**Solution :**

**Question 82:
**Simplify:

**Solution :**

**Question 83:
**Which is greater in the following?

**Solution :**

**Question 84:
**Write a rational number in which the numerator is less than ‘-7 x 11′ and the denominator is greater than ’12+ 4’.

**Solution :**

**Question 85:
**If x = \(\frac { 1 }{ 10 }\) and y = \(\frac { -3 }{ 8 }\), then evaluate x + y, x-y, xxy and x ÷ y.

**Solution :**

**Question 86:
**Find the reciprocal of the following:

**Solution :**

**Question 87:
**Complete the following table by finding the sums.

**Solution :**

**Question 88:
**Write each of the following numbers in the form p/q, where p and q are integers.

(a) six-eighths (b) three and half

(c) opposite of 1 (d) one-fourth

(e) zero (f) opposite of three-fifths

**Solution :**

**Question 89:
**\(\frac { p }{ q }\) = \(\frac { \Box }{ \Box }\)

**Solution :**

**Question 90:
**Given that, \(\frac { p }{ q }\) and \(\frac { r }{ s }\) are two rational numbers with different denominators and both of them are in standard form. To compare these rational numbers, we say that

**Solution :**

**Question 91:
**In each of the following cases, write the rational number whose numerator and denominator are respectively as under:

(a) 5-39 and 54-6 (b) (- 4) x 6 and 8 ÷ 2

(c) 35 ÷ (- 7) and 35 -18 (d) 25 +15 and 81÷40

**Solution :**

**Question 92:
**Write the following as rational numbers in their standard forms.

**Solution :**

**Question 93:
**Find a rational number exactly halfway between

**Solution :**

**Question 94:**

**Solution :**

**Question 95:
**What should be added to \(\frac { -1 }{ 2 }\) to obtain the nearest natural number?

**Solution :**

**Question 96:
**What should be subtracted from \(\frac { -2 }{ 3 }\) to obtain the nearest integer?

**Solution :**

**Question 97:
**What should be multiplied with \(\frac { -5 }{ 8 }\) to obtain the nearest integer?

**Solution :**

**Question 98:
**What should be divided by \(\frac { -1 }{ 2 }\) to obtain the greatest negative integer?

**Solution :**

**Question 99:
**From a rope 68 m long, pieces of equal size are cut. If length of one piece is \(4\frac { 1 }{ 4 }\) m, find the number of such pieces.

**Solution :**

**Question 100:
**If 12 shirts of equal size can be prepared from 27 m cloth, what is length of cloth required for each shirt?

**Solution :**

**Question 101:
**Insert 3 equivalent rational numbers between

**Solution :**

**Question 102:
**Put the (✓), wherever applicable

**Solution :**

**Question 103:
**‘o’ and ‘b’ are two different numbers taken from the numbers 1-50. What is the largest value that \(\frac { a-b }{ a+b }\) can have? What is the largest \(\frac { a+b }{ a-b }\) can have?

**Solution :**

**Question 104:
**150 students are studying English, Maths or both. 62% of the students are studying English and 68% are studying Maths. How many students are studying both?

**Solution :**

**Question 105:
**A body floats \(\frac { 2 }{ 9 }\) of its volume above the surface. What is the ratio of the body submerged volume to its exposed volume? Rewrite it as a rational number.

**Solution :**

In questions 106 to 109, find the odd one out of the following and give reason.

**Question 106:**

**Solution :**

**Question 107:**

**Solution :**

**Question 108:**

**Solution :**

**Question 109:**

**Solution :
**From the above given rational numbers, we can see that \(\frac { -7 }{ 3 }\) is in its lowest form while others have common factor in numerator and denominator.

**Question 110:
**What’s the Error? Chhaya simplified a rational number is this manner \(\frac { -25}{ -30 }\) = \(\frac { -5}{ -6 }\) What error did the student make?

**Solution :**

NCERT Exemplar ProblemsNCERT Exemplar MathsNCERT Exemplar Science