CBSE Class 4 Mathematics NCERT Solutions: Unit 14 Smart Charts

Reviewed by NCERT Help Editorial Team · Updated on 29 Jul 2026

NCERT Solutions PDF Class 4 PDF

CBSE Class 4 Mathematics Unit-14 Smart Charts introduces students to the exciting world of data. We'll learn how to collect information, organize it neatly, and then make sense of it using charts and tables. Imagine finding out how much time your family spends watching TV or listening to the radio – we'll learn to show that visually! We'll also discover what kinds of TV shows or radio programs are everyone's favorites. These NCERT Solutions will guide you through understanding and analyzing this information, helping you build important skills for math and for solving everyday problems. Get ready to become a data detective!

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Quick info

Board	CBSE
Class	Class 4
Subject	Mathematics
Session	2026
Language	English
Type	NCERT Solutions
Chapter	Unit-14 Smart Charts

Chapter summary

Unit 14, "Smart Charts," for Class 4 Mathematics NCERT Solutions focuses on basic data handling. It guides students through collecting information, such as time spent on media or program preferences, and organizing it into tables. The exercises involve interpreting these tables to answer questions about quantities, preferences, and comparisons. This unit helps students develop skills in reading and understanding data presented visually, which is a fundamental aspect of mathematics.

Learning outcomes

Understand the concept of data collection and representation.
Interpret information presented in tables and simple charts.
Calculate time spent on daily activities over a week and a month.
Analyze preferences for different types of media programs.
Compare data to identify most and least liked items.
Solve problems based on collected data.

Topics covered

Paper topics

Data Collection
Data Representation
Tables
Interpreting Charts
Time Calculation (Daily, Weekly, Monthly)
Activity Preferences
Media Consumption (TV/Radio)
Analyzing Data
Comparing Quantities
Identifying Most/Least

Important topics

Interpreting Data from Tables
Calculating Time Spent on Activities
Analyzing Program Preferences
Identifying Trends in Data
Problem Solving with Charts

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Questions and Solutions

Question 1

How many hours do you usually spend watching television (TV) or listening to the radio every day?

Solution: Typically, a student might spend about 1 hour each day watching TV or listening to the radio. This is a personal estimate and can vary for each individual.

Question 2

Note the time you spend in front of a TV or radio every day. Do this for one week. What is the total time spent in a week?

Solution: To find the total time spent in a week, you need to add up the time spent each day. For example, if you spend 1 hour each day, then over 7 days, the total time spent in a week would be:

1 hour/day * 7 days = 7 hours.

So, the time spent in a week is approximately 7 hours.

Question 3

So, in a month you spend about 30 x ____ = ____ hours.

Solution: Assuming a month has 30 days and you spend 1 hour per day on TV or radio, the total time spent in a month can be calculated as:

$30 \text{ days} \times 1 \text{ hour/day} = 30 \text{ hours}$

Thus, in a month, you spend about 30 hours.

Question 4

Find out from your friends the time they spend in a week watching TV or listening to the radio. Present this information in a table showing how many children spend different amounts of time.

Solution: After talking to friends, the time spent on TV or radio in a week can be organized as follows:

Time spent in a week (hours) | Number of children

More than 6 hours | 20

Six hours | 15

Five hours | 15

Four hours | 15

Three hours | 10

Two hours | 12

One hour | 14

Zero hour (do not watch) | 10

This table helps visualize how much time different groups of children spend on these activities.

Question 5

From the table you made, how many children spend more than 6 hours in a week watching TV or listening to the radio?

Solution: Looking at the table created in the previous step, we can find the number of children who spend more than 6 hours. The table shows that 20 children spend more than 6 hours in a week.

Question 6

From the table, how many children spend no time at all watching TV or listening to the radio?

Solution: According to the table, the row for 'Zero hour (do not watch)' indicates the number of children who spend no time on these activities. There are 10 children who spend no time at all.

Question 7

From the table, which group of children spends the most time watching TV or listening to the radio in a week? How many children are in this group?

Solution: The group of children that spends the most time watching TV or listening to the radio in a week is the one that spends 'More than 6 hours'. There are 20 children in this group.

Question 8

How many children spend more than 3 hours watching TV or listening to the radio in a week?

Solution: To find the number of children who spend more than 3 hours, we need to sum the counts for all categories that are greater than 3 hours. These categories are: More than 6 hours (20 children), Six hours (15 children), Five hours (15 children), and Four hours (15 children).

Total children = 20 + 15 + 15 + 15 = 65 children.

Therefore, 65 children spend more than 3 hours in a week.

Question 9

Ask people in your family to name one programme they like and one programme they dislike. Make a table to show this information.

Solution: Here is an example of a table showing program likes and dislikes for family members:

Family Member | Programmes they like | Programmes they dislike

Father | News | Serials

Mother | Serials | Movie

Grandfather | News | Serials

Grandmother | Serials | Sport

Brother | Movie | Serials

Sister | Music | News

Me | Sports | Serials

This table helps to see individual preferences within the family.

Question 10

Based on your family table, what is the kind of programme most family members like?

Solution: By looking at the 'Programmes they like' column in the family table, we can see which programs are liked by the most members. In the example table, 'News' and 'Serials' are liked by multiple family members (Father and Grandfather like News; Mother and Grandmother like Serials). Therefore, Serials and News are the kinds of programs most family members like.

Question 11

Based on your family table, what is the kind of programme most family members dislike?

Solution: To determine the most disliked program, we examine the 'Programmes they dislike' column. In the example table, 'Serials' appear most frequently as a disliked program (disliked by Father, Grandfather, Brother). Thus, most family members dislike serials.

Question 12

Find out from 20 friends the programmes they like and dislike, and write this information in a table.

Solution: Here is a sample table showing the preferences of 20 friends for different types of programs:

Kind of Programme | Number of Children Liking it | Number of Children Disliking it

News | 10 | 10

Serials | 2 | 18

Cartoons | 19 | 1

Music | 18 | 2

Movie | 17 | 3

Sports | 20 | 0

This table summarizes the likes and dislikes of a group of 20 friends.

Question 13

Which kind of programme is liked by most children in your survey?

Solution: Based on the table of friends' preferences, we look for the program with the highest number in the 'Number of Children Liking it' column. 'Sports' is liked by 20 children, and 'Cartoons' is liked by 19 children. Therefore, Sports is the kind of program liked by the most children.

Question 14

Which kind of programme is disliked by the least number of children?

Solution: To find the program disliked by the least number of children, we look at the 'Number of Children Disliking it' column and find the smallest number. 'Sports' is disliked by 0 children, and 'Cartoons' is disliked by only 1 child. Therefore, Sports is the kind of program disliked by the least number of children.

Question 15

How many children like sports programmes?

Solution: According to the table showing friends' preferences, the number of children who like sports programmes is listed in the 'Number of Children Liking it' column for 'Sports'. This number is 20.

Question 16

Is there any kind of programme not liked by anyone? Yes/No. If yes, which one?

Solution: We check the 'Number of Children Disliking it' column for each program. For 'Sports', the number of children disliking it is 0. This means that no child disliked sports programmes. So, the answer is Yes, Sports.

Common mistakes

Misinterpreting data from tables, especially when comparing categories.
Errors in simple multiplication or addition when calculating totals over time.
Confusing 'more than' or 'less than' conditions in data interpretation.
Incorrectly identifying the 'most' or 'least' based on the provided numbers.

Revision tips

Practice creating simple tables to organize information from daily life.
Carefully read each question before answering to understand what data is needed.
Double-check calculations for time spent and program preferences.
Use the provided tables to answer questions about 'most' and 'least' to build analytical skills.

Practice MCQs

Q1. How many children in the survey spend more than 6 hours a week watching TV or listening to the radio?

Q2. According to the family survey, which type of program is disliked by the most family members?

Q3. Which program is liked by the highest number of children in the survey?

Q4. How many children spend zero hours watching TV or listening to the radio in a week?

Q5. If a child spends 1 hour watching TV daily, how many hours do they spend in a week?

Frequently asked questions

What is the main concept covered in CBSE Class 4 Maths Unit 14 Smart Charts?

This unit focuses on collecting, organizing, and interpreting data using tables and simple charts, helping students understand information presented in a structured format.

How do these NCERT Solutions help students with Smart Charts?

The solutions provide step-by-step answers to the textbook questions, explaining how to interpret data, calculate time spent on activities, and analyze preferences, aiding comprehension and revision.

What kind of data is used in the Smart Charts unit?

The unit uses examples like time spent watching TV/radio and preferences for different TV programs to teach data handling concepts.

Are there any calculations involved in this unit?

Yes, students will perform simple calculations such as multiplying daily time spent by the number of days in a week or month, and counting frequencies from tables.

How can I use these solutions for exam preparation?

By working through these rewritten solutions, you can reinforce your understanding of data interpretation and calculation methods, ensuring you are well-prepared for similar questions in exams.

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