<< Chapter < Page Chapter >> Page >

Mathematics

Grade 4

Measurement, space and shape

Module 10

Learn to read, tell and write the time from analogue clocks

Activity 1:

  • To learn to read, tell and write the time from analogue clocks [LO 4.1]
  • To use time measuring instruments, including watches and clocks [LO 4.3]

TIME

  • We know that there are 365 1 4 size 12{"365" { {1} over {4} } } {} days in one year. For your calculations in this module you may use 365 days in a normal year and 366 days in a Leap Year. A Leap Year occurs every 4 years (four quarter days = 1 whole day). A Leap Year may be identified by dividing the last two digits of the year by 4. If there is no remainder, the year is a Leap Year. The year 2004 was a Leap Year. The extra day is always put in February.

There are 24 hours in one day. There are 7 days in a week

There are 60 minutes in an hour. There are 12 months in a year

There are 60 seconds in a minute.

SHORT FORMS:

year = a

day = d

hour = h

minutes = min. (remember: m = metres!)

seconds = s

month = mo

week = wk

In this module we shall also come across tenths and hundredths of a second!

Analogue clocks and watches show twelve hours only. They do not indicate whether it’s morning or afternoon.

Every hour the long hand goes right round the circle once. It counts the minutes.

The long hand tells us the minutes.

The short hand tells us the hour.

The short hand takes twelve hours to go round the circle once. It tells us the hour.

  1. Write down the time on each of the clocks:

Hands on: practical work

On the next page you will find two circles. Cut out the first one. Fold it in half. Open it and shade one half. Write PAST in the half on the right and TO in the half on the left. Now paste your cut-out on the circle below.

TO PAST

When we read the minutes, the first half of the circle shows minutes past the hour. When the long minute hand has gone halfway round the circle, we say it is half past the hour. The second half shows minutes to the next hour.

Now cut out the second circle on the “cutting page” page. Fold it in half and in half again. Open the circle and draw dotted lines on the folds. We have divided the hour into 4 quarters. So we get a quarter past the hour and a quarter to the next hour. Write A QUARTER PAST on the right side and A QUARTER TO on the left side and paste your cut-out on the circle below.

A QUARTER TO A QUARTER PAST

for cutting out

Read the instructions very carefully; be sure you understand before you do each step.

Now we are going to write in the hours on the clock face. On the next page there are two more circles for you to cut out. Cut out the first one. Fold it in half. Fold it in half again. Do not open it. Now, fold the quarter in three (like an ice-cream cone). Can you predict how many parts there should be when you open it?

Yes, there should be 12 marks. Start with the top mark and label it inside the circle: 12. Then work clockwise and number each fold in the circle. (Your spaces between each number should be accurate because you made folds.) You have now written in the hours. Mark each fold at the edge of the circle and write in the number of the hour. (The first one has been indicated.) Paste it on the first circle on this page.

Questions & Answers

do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
Read about ancient clocks like_ hour glass, water clock and sun dial for a quiz and hand on Activity in the class
Neha Reply

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Mathematics grade 4. OpenStax CNX. Sep 18, 2009 Download for free at http://cnx.org/content/col11101/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Mathematics grade 4' conversation and receive update notifications?

Ask