Exercise 2.2 - Chapter 2 Integers Term 3 6th Maths Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated By SaraNextGen

On April 24, 2024, 11:35 AM

Question $1 .$
Write two different real life situations that represent the integer $-3$.

Solution:
(i) A sapling planted at a depth of $3 \mathrm{~m}$
(ii) Sheela lost ₹ 3 on selling an apple.

Question 2 .
Mark the following numbers on a number line
(i) All integers which are greater than $-7$ but less than $7 .$
(ii) The opposite of $3 .$
(iii) 5 units to the left of $-1$
Solution:

Question $3 .$
Construct a number line that shows the depth of 10 feet from the ground level and its opposite.
Solution:

Question $4 .$
Identify the integers and mark on the number line that are at a distance of 8 units from $-6$.
Solution:

Question $5 .$
Answer the following questions from the number line given below

(i) Which integer is greater: $\mathrm{G}$ or $\mathrm{K}$ ? Why?
(ii) Find the integer that represents $\mathrm{C}$.
(iii) How many integers are there between $\mathrm{G}$ and $\mathrm{H}$ ?
(iv) Find the pairs of letters which are opposite of a number.
(v) Say True or False: 6 units to the left of $D$ is $-6$.
Solution:
(i) $\mathrm{K}$ is greater. $\mathrm{K}$ represents $-1$ and $\mathrm{G}$ represents $-3 .$ Because it is to the right of $\mathrm{G}$ in the negative side of the number line.
(ii) C represents $-4$
(iii) G represents $-3$ and H represents 4 .
$\therefore-2,-1,0,1,2,3$ are the 6 numbers between $\mathrm{G}$ and $\mathrm{H}$.
(iv) $(\mathrm{C}, \mathrm{H})$ and $(\mathrm{E}, \mathrm{J})$ are opposite pairs.
(v) False. 6 units to the left of $\mathrm{D}$ is 0 . Because $\mathrm{D}$ represents $+6$ on the number line

Question 6 .
If $\mathrm{G}$ is 3 and $\mathrm{C}$ is $-1$, what numbers are $\mathrm{A}$ and $\mathrm{K}$ on the number line?

Solution

Given G is 3 and C is -1,

$\therefore$ The number line becomes

A represents $-3$ and $K$ represents 7

Question $7 .$
Find the integers that are 4 units to the left of 0 and 2 units to the right of $-3$

Solution:

4 units to the left of 0 is $-4.2$ units to the right of $-3$ is $-1$.

Challenge Problems
Question 8 .
Is there the smallest and the largest number in the set of integers? Give reason.
Solution:
No, we cannot find the smallest (-) and largest (+) number in the set of integers, as the numbers on the number line extends on both the sides without end.
 

Question $9 .$
Look at the Celsius Thermometer and answer the following questions:
i) What is the temperature that is shown in the thermometer?
ii) Where will you mark the temperature $5^{\circ} \mathrm{C}$ below $0^{\circ} \mathrm{C}$ in the Thermometer?
iii) What will be the temperature, if $10^{\circ} \mathrm{C}$ is reduced from the temperature shown in the thermometer.
iv) Mark the opposite of $15^{\circ} \mathrm{C}$ in the Thermometer.

Solution:
(i) Temperature shown in the Thermometer is $-10^{\circ}$
(ii) $5^{\circ} \mathrm{C}$ below $0^{\circ} \mathrm{C}$ is at $-5^{\circ} \mathrm{C}$.
(iii) Thermometer shows $-10^{\circ} \mathrm{C}$ if $10 \mathrm{QC}$ is reduced that means $-10^{\circ} \mathrm{C}-\left(10^{\circ} \mathrm{C}\right)$ gives $^{\wedge} 20^{\circ} \mathrm{C}$.
(iv) Opposite of $15^{\circ} \mathrm{C}$ is $-15^{\circ} \mathrm{C}$

Question $10 .$
$\mathrm{P}, \mathrm{Q}, \mathrm{R}$ and $\mathrm{S}$ are four different integers on a number line. From the following clues, find these integers and write them in ascending order.
i) $S$ is the least of the given integers.
ii) $R$ is the smallest positive integer.
iii) The integers $\mathrm{P}$ and $\mathrm{S}$ are at the same distance from $0 .$
iv) $Q$ is 2 units to the left of integer $R$.
Solution:
According to the clues, plotting the points on a number line, we get

As $S$ is the least of the given integers, it is placed at the left most end.
Since $\mathrm{R}$ is the smallest positive integer, it is placed next to the right of 0 .
As $Q$ is 2 units to the left of $R$ it is placed as the left next number of 0 .
$P$ and $S$ are at the some distance from $0 . P$ is placed opposite to $S$.
$\therefore$ Ascending order : $\mathrm{S}<\mathrm{Q}<0<\mathrm{R}<\mathrm{P}$.
 

Question $11 .$
Assuming that the home to be the starting point, mark the following places in order on the number line as per instructions given below and write their corresponding integers.

Places : Home, School, Library, Playground, Park, Departmental Store, Bus Stand, Railway station, Post office, Electricity Board.
Instructions:
i) Bus Stand is 3 units to the right of Home.
ii) Library is 2 units to the left of Home.
iii) Departmental Store is 6 unit to the left of Home
iv) Post office is 1 unit to the right of the library.
v) Park is 1 unit right of Departmental Store.
vi) Railway Station is 3 units left of Post Office.
vii) Bus Stand is 8 units to the right of Railway Station.
viii) School is next to the right hf Bus Stand.
ix) Playground and Library are opposite to each other.
x) Electricity Board and Departmental Store are at equal distance from Home.

Solution:

Question $12 .$
Complete the table using the following hints:

C1: the first non-negative integer.
C3: the opposite to the second negative integer.
C5 : the additive identity in whole numbers.
C6: the successor of the integer in C2.
$\mathrm{C} 8$ : the predecessor of the integer in $\mathrm{C} 7$
C9 : the opposite to the integer in C5.
Solution:
C1: First non negative integer is 0
C3 : Second negative integer is $-2$ its opposite is 2
C5: 0 is the additive identity in whole numbers
C6 : C2 has $-5$. Its successor is $-\mathrm{A}$

C8 : Integer in C7 is $-7$. Predecessor of-7 is $-8$
C9: C5 has 0 . Opposite of 0 is 0 .

Question $13 .$
The following bar graph shows the profit $(+)$ and loss $(-)$ of a small scale company (in crores) between the years 2011 to 2017 .

i) Write the integer that represents a profit or a loss for the company in 2014 ?
ii) Denote by an integer on the profit or loss in $2016 .$
iii) Denote by integers on the loss for the company in 2011 and 2012
iv) Say True or False: The loss is minimum in $2012 .$
v) Fill in: The amount of loss in 2011 is ___as profit in $2013 .$
Solution:
(i) Profit ₹ 45 crores. $\therefore$ Ans : $+45$
(ii) In 2016 neither profit nor loss happened. $\therefore$ Ans : 0
(iii) In 2011 loss is 10 crores and in 2012 loss is 20 crores. $\therefore$ Ans : $-10$ and- 20 .
(iv) False. In 2011 the company's loss is minimum.
(v) The same. Because in 2013 the profit is 10 crores and in 2011 the loss is 10 crores.