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Math-Magic Solutions for Class-4, Chapter-14: Smart Charts

Smart Charts deals with the concept of data handling. This chapter have exercises on representing and drawing conclusion from data. Representing data using bar graphs and circle graphs.

The solutions for Math-Magic Chapter-14 have been created and verified by our experienced subject matter experts, according to the CBSE syllabus and guidelines of NCERT. For practice, our subject matter experts have created very interactive, activity-based, and Image-based worksheets on these topics to enhance learning.

Download Chapter 14 Smart Charts in PDF format for free here.

**Chapter 14: Smart Charts **

**Question 1 : **Note the time you spend in front of a TV or radio every day. Do
this
for one week. The time spent in a week is _________ hours.

**Answer : **
Observe the time you spend watching TV or listening to the radio and
keep a record of it for a week. The answer may vary from student to
student.

A sample answer is:

Suppose you spend 1 hour daily watching TV, then time spent in a
week is 7 hours.

**Question 2 : **So in a month you spend about 30 × ___ = _____ hours.

**Answer : **
The answer will vary based on the previous answer. There are 30 days
in a month. Multiply the time spend in a day by 30 to get the total
time spent watching TV or listening to the radio in a month.

A sample answer is:

The time spent in a day is 1 hour.

Therefore, time spent in a month is:

30 × 1 = 30 hours.

**Question 3 : **Find out from your friends the time they spend in a week.

**Answer : **Ask your friends to keep a record of the time they spend in front of
the TV or radio in a week and fill in the table accordingly. The answer
will vary based on the information collected by your friends.

A sample answer is:

**Question 4 : ** From your table
Watching TV/listening to the radio...

________ children spend more than 6 hours in a week.

________ children spend no time at all.

Most children spend ________ hours in a week.

________ children spend more than 3 hours.

**Answer : **Observe the data entered in the table to answer this question. The
answer will vary based on the previous table.

A sample answer is:

8 children spend more than 6 hours in a week.

5 children spend no time at all.

Most children spend 5 hours in a week.

The table shows that 7 children spend 4 hours in a week, 9 children
spend 5 hours in a week, 5 children spend 6 hours in a week, and 8
children spend more than six hours in week.

Add 7, 9, 5, and 8 to get the total number of children that spend more
than 3 hours in a week.

7 + 9 + 5 + 8 = 29

Therefore, 29 children spend more than three hours.

**Question 5 : **(1) Ask people in your family to name one programme they like and
one programme they dislike. Make a table.

**Answer : ** Ask each of your family members to name one TV programme that
they like and one programme that they dislike and note them down in
the table. The answer may vary from student to student based on their
family and their choices.
A sample answer is:

**Question 6 : **The kind of programme most family members like ____.

**Answer : **The answer will vary based on the previous table. Observe the data in
the table carefully and find out the programme that is most liked by
majority of the family members.

A sample answer is:

The table shows that most of the family members like News.

**Question 7 : **The kind of programme most family members dislike ________.

**Answer : ** The answer will vary based on the previous table. Observe the data in
the table carefully and find out the programme that is most disliked by
majority of the family members.

The table shows that most of the family members dislike serials.

**Question 8 : **2) Find out from 20 friends the programmes they like and dislike,
and
write down the information in the table.

**Answer : **Ask 20 of your friends about the programmes they like and dislike
and keep a count of the number of friends that like and dislike the
programmes. Enter the data in the table. The answer may vary based
on your friend’s choice.

A sample answer is:

**Question 9 : ** Which kind of programme is liked by most children?

**Answer : **The answer will vary based on the previous table. Observe the second
column, i.e., “Number of children liking it” and look for the highest
number. The programme that corresponds to the highest number will
be the correct answer.

A sample answer is:

The table shows that most of the children like cartoons.

**Question 10 : ** Which kind of programme is disliked by the least number of
children?

**Answer : **The answer will vary based on the previous table. Observe the third
column, that is “Number of children disliking it” and look for the
lowest number. The programme that corresponds to the lowest number
will be the correct answer.

A sample answer is:

The table shows that most of the children dislike serials.

**Question 11: **How many children like sports programmes?

**Answer : **Answers will vary based on the previous table. Observe the last row
and the second column, that is, “Number of children liking it” to
check the number of children who like sports programmes.

A sample answer is:

The table shows that 1 child likes sports.

**Question 12: **
Is there any kind of programme not liked by anyone? Yes/No.

If yes, which one?

**Answer : **

Answers will vary based on the previous table. Observe the second
column, that is, “Number of children liking it” and check if any row
has 0. If it has 0 then there are programmes that are not liked by
anyone or else there will be no programme that is not liked by
anyone.

A sample answer is:

The table shows that there is no such programme that is not liked by any children.

**Question 13: ** Read the poem carefully and answer these questions:

a) Which word comes most often in the poem?

**Answer : **

It can be observed that the word “I” has been used most often in the
poem.

In the entire poem the word “I” is used 4 times.

**Question 14: **b) Which letter has been used most?

**Answer : **
It can observed that the letter “e” has been most often in the poem. In
the entire poem the letter “e” is used 20 times.

**Question 15: **Find out:

c) Which letter comes the least?

**Answer : **It can be observed that the letters “b” and “v” are least used in the
poem. The letters “b” and “v” are used only once in the entire poem.

**Question 16: **
Take a paragraph you like from your language textbook. Read
carefully and find out:

a) Which word comes most often?

How many times? ________

**Answer : **

Answers may vary based on the paragraph selected. Choose any
paragraph from your language textbook and read it carefully. Observe the words in the paragraph
that have been repeated the maximum
number of times. Count the number of times it is repeated to answer
the question.

**Question 17: **
b) Which word comes least often? ________________

**Answer : **The answers will vary.

Answers may vary based on the paragraph selected. Observe the
words in the paragraph that have been repeated the minimum number
of times to answer the question.

**Question 18: **
c) The letter used most often is ________________

**Answer : **Answers may vary based on the paragraph selected. Observe each
letter that is used in the paragraph and count the number of times it is
used. Then find out the letter that has been used the most.

**Question 19: **
d) The letter used least often is ________________

**Answer : **Answers may vary based on the paragraph selected. Observe each
letter that is used in the paragraph and count the number of times it is
used. Then find out the letter that has been used the least.

**Question 20: **
Find out from your classmates and fill the table:

**Answer : **
Ask your friends about their main food. Count the number of friends
that eat the same kind of food and enter it in the table. Answers may
vary based on the information collected from your friends.

A sample answer is:

**Question 21: **
Look at the table and tell:

Most children eat food made from _____________.

**Answer : **
Answers may vary based on the table in the previous answer. Observe
the information in the table and look at the largest number in the
second column. The main food that corresponds to the largest number
is the correct answer.
A sample answer is:

The table shows that most of the children eat food made from rice.

**Question 22: **
Compared to children who eat rice, those who eat wheat are
more/less/equal.

**Answer : **Answers will vary based on the table in the previous answer. Observe
the information in the table and see the number of children who eat rice
and wheat. Check if the number of children eating rice is
more/less/equal to the number of children eating wheat.
A sample answer is:

The table shows that 23 children eat food made from rice and 25 children eat food made from wheat. Therefore, the children who eat rice are less in comparison to the children who eat wheat.

**Question 23: **
Compared to those who eat wheat, children eating ragi are more/less.

**Answer : **Answers will vary based on the table in the previous answer. Observe
the information in the table and see the number of children who eat
wheat and ragi. Check if the number of children eating wheat is more
or less than the number of children eating ragi.
A sample answer is:

The table shows that 25 children eat food made from wheat and 7 children eat food made from ragi. Therefore, the children who eat wheat are more in comparison to the children who eat ragi.

**Question 24: **
a) How many children are acting in the drama?

**Answer : **
Each green triangle represents 3 children. From the table chart, it can
be observed that there are 3 green triangles for acting.

Multiply 3 by 3 to get the number of children acting in the drama.

3 × 3 = 9

Therefore, 9 children are acting in the drama.

**Question 25: **
b) Which are more—children making the sets or those acting?

**Answer : **The number of children acting is equal to 9.
There are 2 green triangles for making the sets. Multiply 3 by 2 to get
the number of children making the sets.

2 × 3 = 6

Therefore, there are 6 children making the sets in the drama. Hence,
the number of children acting is more than the number of children
making the sets.

**Question 26: **
c) What is being done by most of the children?

**Answer : **It is observed from the table chart that the maximum number of green
triangles are in playing the music. Therefore, most of the children
play the music in the drama.

**Question 27: **
d) How many children are collecting dresses?

**Answer : **Each green triangle represents 3 children. From the table chart, it
can
be observed that there are 3 green triangles for collecting dresses.
Multiply 2 by 3 to get the number of children collecting dresses.

2 × 3 = 6

Therefore, 6 children are collecting dresses in the drama.

**Question 28: **
Cut long paper strips from waste paper. Give one strip to each of your
friends. Now put the paper strip around your head and tear off the extra
strip. On a big sheet, paste these paper strips along a line. Some children
had pasted their strips and made a chart like this.

Your chart should also look like this.

**Answer : **Take a sheet of waste paper and cut it into a few strips. Give one
strip
to each friend. Ask your friend to put the strip around their head and
cut off the extra bits. Place all the strips on a sheet to make a chart.
The answer may vary based on the friend’s head.

**Question 29: **Use a scale and find out from your chart:

The length of the longest strip is _________ cm. So ____________

has the biggest head.

**Answer : **Answers may vary based on the chart in the previous answer. Observe
the length of each strip and check which is the longest one. Take a ruler
and measure the length of the longest strip and also check who has the
biggest head.

**Question 30: **
The smallest strip is ___________ cm long. It belongs to
__________.

**Answer : **Answers may vary based on the chart in the previous answer. Observe
the length of each strip and check which is the smallest one. Take a
ruler and measure the length of the smallest strip and also check who
has the smallest head.

**Question 31: **
The Chapati Chart shows the number of children in different clubs.

If there are 200 students in the school, look at the above Chapati
Chart and tell the number of members in each club:

The Games Club has ______ members.

**Answer : **The above Chapati Chart shows that half of the students are the
members of the Games Club.

The total number of students is 200. Divide 200 by 2 to get the
number of students who are members of Games Club.

200 ÷ 2 = 100

Hence, the Games Club has 100 members.

**Question 32: **
The Garden Club has ______ members.

**Answer : **The Chapati Chart shows that one-fourth of the students are the
members of the Garden Club.

The total number of students is 200. Divide 200 by 4 to get the
number of students who are members of the Garden Club.

200 ÷ 4 = 50

Hence, the Garden Club has 50 members.

**Question 33: **
There are _____ members in the Drawing Club.

**Answer : **The Chapati Chart shows that one-fourth of the students are the
members of the Drawing Club.

The total number of students is 200. Divide 200 by 4 to get the
number of students who are members of the Drawing Club.

200 ÷ 4 =50

Hence, there are 50 members in the Drawing Club.

**Question 34: **
Who likes to get wet in the rain? A child made this Chapati Chart
after asking his friends.

See the Chapati Chart and tell:

1) How many children like to get wet in the rain?

a) half

b) one-fourth

c) three-fourth

**Answer : **Observe the Chapati Chart. If you divide the circle into four equal
parts, three parts represent the children who like to get wet in the rain.
Therefore, three-fourth of the children like to get wet in the rain.
Hence, option c) is the correct answer.

**Question 35: **
2) How many children do not like to get wet in the rain?

a) half

b) one-fourth

c) three-fourth

**Answer : **Observe the Chapati Chart. If you divide the circle into four equal
parts, one part represents the children who do not like to get wet in the
rain.

Therefore, one-fourth of the children do not like to get wet in the rain.

Hence, option b) is the correct answer.

**Question 36: **
If the number of children in the class is 28, then tell the number of
children

Who like to get wet in the rain?

**Answer : **Step 1: The total number of children is 28.
Three-fourth of the children like to get wet in the rain. Divide 28 by 4
to get one-fourth of the children.

28 ÷ 4 = 7

Step 2: Multiply 7 by 3 to get three-fourth of the total children.

7 × 3 = 21

Therefore, 21 children like to get wet in the rain.

**Question 37: **
Who do not like to get wet in the rain __________

**Answer : **Total number of children is 28.

Number of children who like to get wet in the rain is 21.

Subtract 21 from 28 to get the number of children who do not like to
get wet in the rain.

28 – 21 = 7

Therefore, 7 children do not like to get wet in the rain.

**Question 38: **
Some children were asked which of these they liked most—Tea,
Coffee or Milk.

Total Number of children ______.

**Answer : **
Add 20, 10, and 10 to get the total number of children.

20 + 10 + 10 = 40

Therefore, there are 40 children in total.

**Question 39: **
Find out from the table:

Children who like milk are 1/2 or 1/4
of the total children.

**Answer : **Total number of children is 40.

Number of children who like milk is 20 which is half of the total
students.
Therefore, children who like milk are 1/2 of the total children.

**Question 40: **
Children who like coffee are 1/2 or 1/4
of the total children.

**Answer : **Total number of children is 40.

Number of children who like milk is 10 which is equal to one-quarter
of the total student.

Therefore, children who like coffee are 1/4
of the total children.

**Question 41: **
Show the liking for Tea, Coffee or Milk in a Chapati Chart.

**Answer : **From the table: Half of the children like milk, one- quarter of the
children like coffee, and one-quarter of the children like tea.

Draw a circle and shade half of a circle with a colour to represent the
children who like milk, shade one-quarter of the circle with another
colour to represent the children who like coffee, and shade one- quarter
of the circle with a different colour to represent the children who like
tea.