# 1st Class Mathematics Time and Calendar Time and Calendar

## Time and Calendar

Category : 1st Class

LEARNING OBJECTIVES

• understand the concept of time, day, week, month and year.

QUICK CONCEPT REVIEW

TIME

Have you ever wondered that if there was no clock, how would you know when to go to school or when to watch your favourite cartoon television?

A clock tells us time.

The numbers 1 to 12 are written on it.

It has two hands. The long hand is the minute hand. The short hand is the hour hand.

The place where numbers are written is called the dial of the clock. The hour hand moves from one number to the next in 1 hour.

DAY TIME AND NIGHT TIME

We do number of activities from morning to night.

When the sun rises, it is light and we are awake. It is daytime. We perform various activities in day time. For example we go to school, eat, play with our friends and study. When it is dark, it is night time. We sleep at night.

Real Life Example

Calendar helps us to keep record of important dates like birthday, holidays, summer vacations etc.

Clock helps us to set morning alarm for school and offices.

If someone asks you, what is the time? Then how will you answer? Let us understand

and if long hand is pointing at 12 and short hand is pointing at 6 than we say that time is 60' clock. You will learn more about reading time in higher classes.

MORE TIME-LESS TIME

Some activities take less time and some take more time to do. Let us understand with the help of some examples Example:

 Activities which take less time Activities which take more time To brush teeth To read a comic To drink a glass of water To play with friends To comb hair To take proper sleep

TYPES OF CLOCK IN USE

We use different types of clock:

1. Wall Clock
2. Alarm Clock .
3. Wrist Watch
4. Digital Clock

Wall Clock: A wall clock is a clock mounted on the wall.

Alarm Clock: Alarm clock is used to set up the alarm.

Wrist Watch: A wrist watch is a watch that is worn on the wrist.

Digital Clock: A digital clock does not have hands and shows time in digits. These clocks use two sets of numbers separated by a colon to indicate the hour and minutes.

Historical Preview

In ancient time, when there was no clock people kept track of time by the help of sun rise and sun set.

THE CALENDAR

Have you ever wondered if there was no calendar, you would not be able to know in which month you birthday comes?

DAYS

There are 7 days in a week.

Do you know?

60 minutes make 1 hour.

24 hours make 1 day.

If today is Thursday than yesterday was Wednesday and tomorrow will be Friday.

MONTHS IN A YEAR

There are 12 months in a year.

Some months have 31 days.

Some months have 30 days.

February has 28 or 29 days. It is the only month that does not have 30 or 31 days.

In a year, there are 365 days. Each leap year has 366 days, when there are 29 days in the month of February.

Leap year comes after every 4 years!

Do you know?

The calendar which we are using currently is called Gregorian Calendar, before gregorian calendar, most of the countries relied on the Julian calendar. The Julian calendar creates an error of 1 day every 128 years.

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