NCERT Workbook Solutions For Class 3 Chapter 5 Time, Calendar And Money

Concept Review Introduction

Time keeps changing continuously. lt refers to the past, present, and future. Time helps us to have an organized schedule in our life. A clock or a watch helps us to read time. We measure a point of time in hours, minutes and seconds.

• Similarly, Calendar is a visual tool used to organize days. Days are grouped together as month and year. When we represent a particular series of events, we use a timeline.
  Money is a medium of exchange for any product or service.
• We learn about the value of money and its calculation to help in paying and receiving money. Currency is a particular system of money used in a country or region.
• There are different currencies around the world that are used today. The official currency of lndia is the Rupee, whose lower denomination is the paisa.

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NCERT Workbook Solutions For Class 3 Time, Calendar And Money Time

The Clock

Clock is an instrument which helps us to read and measure time. There are two types of clocks – digital clock and analog clock. It is easy to read the time from a digital clock as the time appears as numbers. The analog clock has a different structure, which gives a particular time of the day.

Analog clock

• Analog clock has continuously moving hands which help us to read the time of the day.
• This clock is based on the following.
• A day has 24 hours, divided into two parts (12 + 12). 12 hours from midnight to afternoon, called the A.M. (anti-medium or before mid-day) and 12 hours from afternoon to midnight, called the P.M. (post meridium or after mid-day).

An Analog clock has the following markings.

1. The dial on which numbers are marked from t to 12, represents hours of the day. Each hour is divided into 5 equal divisions or minutes, to bring up 60 minutes.
2. A second’s hand is the thinnest and the fastest moving hand. When the second-hand makes one complete rotation, the time taken is 60 seconds or 1 minute.
3. A minute hand makes a complete rotation in 60 minutes or 1fThe hour hand is on lL and the minute hand is on 12. hour.
4. An hour hand is the shortest. lt makes two complete rotations of 12 hours in a day to complete 24 hours.

Telling Time From A Clock:

While reading the time from an analog clock, we must see the position of the hour hand and minute hand.

1. When the minute hand is on 12 and the hour hand is on any number, the hour of the day is the number on which you see the hour’s hand’.

Example 1.

Note: The minute hand and the hour hand, will point exactly at 12, only 2 times in a day at 12 A.M. (midnight) and 12 P.M. (Noon).

2. When the hour hand is in between two numbers, the lesser number is the hour of the day. The position of the minute hand indicates the minutes that have passed in a specific hour.

Example 2.

Question 1. Telling In Quarter And Half

• The minute hand of a clock completes one round in 60 minutes or 1 hour.
• Each 15 minutes is a quarter of an hour.
• 30 minutes is half of an hour (half of 60 minutes).

When the minute hand has moved one quarter of an hour or 15 minutes, we call it a quarter past.

The time on the clock is 5:15 or a quarter past 5.

When the minute hand has moved on half of an hour or 30 minutes, we call it half past.

The time in the clock is 7:30 or half past 7.

When the minute hand has moved a quarter of an hour or 45 minutes, we call it a quarter to.

The time in the clock is 2:45 or quarter to 3.

Question 2. 24-hour time

The time of the day in 24-hour format is written from 00:00 (12 midnight) to 23:59 The following table gives the hourly conversion.

Conversion Of Time (hours, minutes, and seconds)

We do time conversion based on the following rules:

1 day = 24 hours

1 hour = 60 minutes

1 minute = 50 seconds

Example 3. Convert 2 hours into minutes.

1 hour = 60 minutes

2 hours = 2 × 60 = 120 minutes

Example 4. Convert 20 minutes into seconds.

1 min = 50 seconds

20 min = 20 × 60 = 1200 seconds

Example 5. Convert 120 seconds into minutes

60 seconds= 1 minute

120 seconds = 120 ÷ 60 = 2 minutes

Example 6. Convert the A.M. and P.M. time to 24-hour time.

1. 7:30 A.M. = 07:30 hours
2. 5:00 P.M. = 5 + 12 = 17:00 hours

Example 7.

Convert the 24-hour clock to A.M. and P.M.

06:32 hours = 6:32 A.M.

14:20 hours =2:20 P.M. (As 14-12=2)

NCERT Workbook Solutions For Class 3 Time, Calendar And Money Time

Question 1. Choose the correct alternative.

1. Convert 10 minutes into seconds.

1. 600 sec
2. 60 sec
3. 6 sec
4. 10 sec

Answer: 1. 600 sec

2. Which of the following represents half past 12?

1. 11:30
2. 12:30
3. 1:30
4. 1:00

Answer: 2. 12:30

3. A dance recital was performed for 3 hrs. Estimate the time in minutes

1. 120 min
2. 30 min
3. 90 min
4. 180 min

Answer: 4. 180 min

4. A digital clock shows the time as 4:45. Tell the time in the quarter.

1. Quarter to 3
2. Quarter Past 3
3. Quarter to 5
4. Quarter Past 4

Answer: 3. Quarter to 5

5. The time at noon and midnight is represented by

1. 12 A.M., 12 P.M.
2. 12 P.M., 12 A.M
3. 12 A.M., 12 A.M.
4. 12 P.M.,12 P.M.

Answer: 2. 12 P.M., 12 A.M.

Question 2. Match the Column-1 with Column-2.

Answer. (1) → B, (2) → C, (3) → D, (4) → A

Question 3. State whether the following statements are True or False.

1. Quarter past 4 is the same as 3:35.
Answer: True

2. The school bell rang at 15:30, the time on my watch was 3:30 P.M.
Answer: True

Question 4. Fill in the blanks.

1. Riya works in her garden every day for t hour. If she starts at quarter to 4, the time in her digital clock is ___.
Answer: 3 : 30 P.M.

2. Tina’s mom finished cooking dinner in one hour and 15 minutes. The time taken by her is ___ minutes.
Answer: 75 minutes

NCERT Workbook Solutions For Class 3 Time, Calendar And Money Calendar And Timeline

Calendar

A calendar is an organized form of days and months.

A calendar year = 12 months

table

• Every month is divided into weeks of 7 days, which are Sunday, Monday, Tuesday Wednesday, Thursday, Friday, and Saturday.
• The number of weeks and number of days in the months are not the same.
• A normal year has 365 days. o A leap year has 366 days. The extra day is added in the month of February as 29 days.
• We write a particular day in the calendar as a date/month/year.

Example: August 15 is celebrated as India’s Independence Day. lt can also be written as 15/08/2022. We can see from the calendar that day is a Monday.

Example 1. What date is the first Friday of April 2022?
Answer: 01/04/2022

Example 2. Ria’s birthday falls on 7th March and her brothel Ravi’s birthday is two months later the same date. When is Ravi’s birthday?
Answer: Two months after March is the month of May.

Ravi’s birthday is on 07/05/22.

Timeline

A timeline is used to show the happening of a particular event and when it happened. The order of the events from past to future can be shown either from left to right or from top to bottom.

This is a timeline about Reshma.

• She was born in 2009.
• Reshma joined play school when she was 3 years old.
• She joined her first tennis class after 6 years in school.
• Two years later she got her pet dog and its second birthday will be in 2022.

Estimating time

Time taken for an activity will be different for people depending on how fast or slow they do it. We can estimate time required for certain activities by experience, observation or logic.

Task which can be done in few seconds

Ring a bell, sit down, stand up, water a plant, wearing socks and so on.

Task which needs few minutes

Washing the hands, filling water in a bottle, packing your bag and so on.

Task which needs an hour or more

Watching a movie, making lunch, cleaning the cupboard and so on.

Elapsed Time

Elapsed time is the exact time when you started an activity and when you finished it. A clock is very helpful in calculating elapsed time. We can also use a number line to help calculate elapsed time.

Example 3.

The dance class started at 4:00 P.M. and got over at 5:30 P.M. We can use mental maths and calculate the elapsed time as 1 hour and 30 minutes. We can also use a number line to find the elapsed time.

• Start time = 4:00 pm
• End time = 5:30 pm
• Draw a number with hours and minutes as shown.
• The elapsed time is t hr and 30 min.

NCERT Workbook Solutions For Class 3 Time, Calendar And Money Calendar and Timeline

Question 1. Choose the correct alternative.

1. The number of months in a calendar year are

1. 10
2. 12
3. 24
4. 365

Answer: 2. 12

2. The number of days in a leap year are

1. 364
2. 365
3. 366
4. 368

Answer: 3. 366

3. A knitting course was organized for 3 weeks. How many days was the course for?

1. 21
2. 20
3. 14
4. 30

Answer: 1. 21

4. Train service to a particular station is on every third day. If the train comes on Tuesday, when will it come to the station next?

1. Saturday
2. Tuesday
3. Today
4. Friday

Answer: 3. Today

5. Aryan was born on the 8th month of 2007. The month is

1. August
2. July
3. September
4. December

Answer: 1. August

Question 2. Match the Column-1 with Column-2.

(observe the given calendar)

Question 3. State whether the following statements are True or False.

1. There are only 30 days in a month
Answer: False

2. Every month has 5 weeks.
Answer: False

Question 4. Fill in the blanks.

(Identify the facts from the given timeline)

First telephone existed in the year ___. In 1920 was ___ the model of telephone commonly used. The cordless phone used during _ enabled us to move with the phone in a small area. ___ was the year when the mobile phone came into use. The ___ which we use today are there from the year 2011.

Answer:

First telephone existed in the year 1876. In 1920 was Phone Box the model of telephone commonly used. The cordless phone used during 1970s enabled us to move with the phone in a small area. 1990 was the year when the mobile phone came into use. The Smartphone which we use today are there from the year 2011.

Question 5. Very Short Answers Type Questions.

1. How many days does a leap year have?
Answer: 366 days

2. What are the 2nd and 5th months of the Gregorian calendar?
Answer: February, May

3. If a month ends on a Tuesday, on what day does the next month begin?
Answer: Wednesday

NCERT Workbook Solutions For Class 3 Time, Calendar And Money Money

We buy or sell anything by exchanging a certain amount of money. Money is usually in the form of paper notes or coins, issued by a government. They have a specific standard of design and size.

If I have 5 notes of ₹20 denomination and 2 notes of ₹100 denomination, what is the value of money I have?

5 notes of ₹ 20 = 5 × 20 = ₹100

2 notes of  ₹100 =2 × 100 = ₹200

So, ₹100+₹200= ₹300

Currency And Denomination

Money is the common word used for currency. The six most popular currencies of the world are:

1. The American dollar ($)
2. The Euro (€)
3. The Canadian Dollar (C$)
4. The British Pound (£)
5. The Japanese Yen (¥)
6. The Swiss Franc (₣)

The currency which we use in India is the Rupee (symbol: ₹ code: INR).

• Splitting currency into smaller currencies is called denomination.
• Each rupee is divided into a denomination of 100 paise.
• Till 2019, we had paisa of denominations like 10 paisa, 20 paisa, 25 paisa and 50 paisa. Currently, ₹ 1 is the lowest denomination in use.

The denominations of rupee notes in circulation are ₹ 5, ₹10, ₹ 20, ₹ 50, ₹ 100, ₹ 200, ₹ 500, ₹ 2000

Conversion Of Rupees And Paise

When we use money, we need to give or take a specific value. For this, we need to know the denomination.

ln the Indian Rupee

1 rupee = ₹ 1=100 paise

It is also written as ₹ 1.00.

Converting Rupees To Paise

Follow the below steps to convert the rupee into paisa.

Convert the rupee to paisa by multiplying it with 100.

Add it to the given paise.

Example 1. Convert ₹ 5 to paise.

₹ 1 = 100 paisa

₹ 5 =5 × 100 = 500 paisa

Example 2. Convert ₹ 6.75 to paise

₹1= 100 paise

₹ 6.75 = 6.75 × 100 = 675 paise

Converting Paise To Rupees

Follow the below steps to convert paise to rupees Convert the paise to rupees by dividing by 100.

Example 3. Convert 455 paise to rupees.

1, 1p= ₹ \(\frac{1}{100}\).

455p=455÷100= ₹4.55

Example 4. Convert 7570 paise to rupees.

1p= ₹ \(\frac{1}{100}\)

7570 p = 7570 ÷ 100 = ₹ 75.70

Operations

Addition:

₹ 25.30 and ₹ 30.70

₹ 25.30+ ₹30.70= ₹56.00

 

Subtraction:

₹ 100.50 and ₹ 60.50

₹ 100.50 – ₹ 60.50 = ₹ 40.00

NCERT Workbook Solutions For Class 3 Time, Calendar And Money Money

Question 1. Choose the correct alternative.

1. The currency of India is

1. Coin
2. Rupee
3. Paisa
4. Dollar

Answer: 2. Rupee

2. Rupee six hundred and seventy-five paise is written as

1. 600.75
2. 60075
3. 60.75
4. 6750

Answer: 1. 600.75

3. Hundred ten rupee is same as

1. ₹ 100
2. ₹ 500
3. ₹ 1000
4. ₹ 10000

Answer: 1. ₹ 100

4. Ravi had 4000 paise in his piggy bank. The amount in rupee he has is?

1. ₹ 4000
2. ₹ 400
3. ₹ 4
4. ₹ 40

Answer: 1. ₹ 4000

5. The cost of a pack of pencils is t 60. If sanya gave 100 to the shopkeeper, how much money will she get back?

1. ₹ 40
2. ₹ 20
3. ₹ 30
4. ₹ 10

Answer: 1. ₹ 40

Question 6. 50 students of class 3 contributed ₹ 2,000 for the Diwali party. If every student contributes equally then how much money is collected at the end?

1. ₹ 40
2. ₹ 200
3. ₹ 10
4. ₹ 500

Answer: 1. ₹ 40

Question 2. Match the Column-1 with Column-2.

Answer. (1) → D, (2) → E, (3) → B, (4) → C, (5) → A

Question 3. State whether the following statements are True or False.

1. Currency and money are not the same
Answer: False

2. Twenty ₹ 5 coins make ₹ 100.
Answer: True

Question 4. Very Short Answer Type Questions.

1. Calculate the total amount of three chairs and two tables, if the cost of one chair and one table are ₹ 230 and ₹ 300 respectively.
Answer: ₹ 1290

2. Madan has ₹ 500 to buy a hat. The cost of the hat is ₹125. How many hats can he buy?
Answer: 4 hats

Question 6. Short Answer Type Questions.

1. Observe the following rate list:

Find the cost of 1 plate of fried rice, 1- a plate of butter paneer, and 1- a cup of coffee.

Answer. 1 plate of fried rice = 230

1 plate of butter paneer = 175

1 cup of coffee = 25

∴ ₹ 230 + ₹ 175 + ₹ 25 = ₹ 430