Basic Measurements (Times)Form 1

8/3/2019 Basic Measurements (Times)Form 1

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CCHAPTER 8HAPTER 8

BASICEASUREMENTSBASICEASUREMENTS

8.48.4

THE 12THE 12--HOUR ANDHOUR AND

THE 24THE 24--HOUR SYSTEMHOUR SYSTEM


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LEARNING OUTCOMESLEARNING OUTCOMES

I.I. READ AND WRITE TIMES INREAD AND WRITE TIMES INTWELVETWELVE--HOUR SYSTEM.HOUR SYSTEM.

II.II. READ AND WRITE TIMES INREAD AND WRITE TIMES INTWENTYTWENTY--FOURFOUR--HOUR SYSTEM.HOUR SYSTEM.

III.III. CONVERT TIME IN TWELVECONVERT TIME IN TWELVE--HOUR SYSTEM TO TWENTYHOUR SYSTEM TO TWENTY--FOUR HOUR SYSTEM ANDFOUR HOUR SYSTEM ANDVICEVICE--VERSA.VERSA.

IV.IV. SOLVE PROBLEMS INVOLVINGSOLVE PROBLEMS INVOLVING

TIME.TIME.


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12 HOUR SYSTEMS

a.m.= ante meridiem

BEFORE MIDDAYp.m. = post meridiem

AFTER MIDDAY


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What is the time shown on the clockabove?

It is eleven o clock.


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THE 12THE 12--HOUR SYSTEMHOUR SYSTEM

Midnight Morning Noon Afternoon Midnight

12.00 6.00 12.00 6.00 12.00

a.m. p.m.

12 hours 12 hours


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In the 12-hour system, time is writtenusing 3 or 4 digits with a dot place

between the digits to separate the hours

from the minutes.

The time starts from 12 midnight isexpressed as a.m. and the timestarts from 12 noon is expressed as

p.m.


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EXAMPLEEXAMPLE

7. 2 5 a.m.7. 2 5 a.m.

Hour Dot Minute Day time


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IT CAN BEREADAS:IT CAN BEREADAS:

Seven twenty five a.m.Seven twenty five a.m.

Twenty five minutes past seven a.m.Twenty five minutes past seven a.m.

Thirty five minutes to eight a.m.Thirty five minutes to eight a.m.

Seven twenty five in the morningSeven twenty five in the morning


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ExerciseExercise1.1. Use a.m. or p.m. to denote the time.Use a.m. or p.m. to denote the time.

a) 4.35 in the morninga) 4.35 in the morningb) 8.20 at nightb) 8.20 at night

c) 12 middayc) 12 midday

2.2. Write the times in words.Write the times in words.a) 2.55 a.m.a) 2.55 a.m.

b) 1.20 p.m.b) 1.20 p.m.

C) 7.32 p.m.C) 7.32 p.m.

3.3. Write the time in numeralsWrite the time in numerals

a) Nine thirtya) Nine thirty--six in the morningsix in the morning

b) Four fiftyb) Four fifty--one in the afternoonone in the afternoon

c) Twelve midnightc) Twelve midnight


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HOUR SYSTEMHOUR SYSTEM

FLIGHT DEPARTS ARRIVES

AK 5702 0655 (JHB) 0820 (KCH)

AK 5706 2015 (JHB) 2140 (KCH)

AK 5708 2035 (JHB) 2155 (KCH)

FRIDAY 15 AUGUST 2008

JOHOR BAHRU (JHB) TO KUCHING (KCH)


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Midnight

0000

24-HOUR SYSTEM

Morning Noon Afternoon Midnight

0600 1200 1800 2400

12.00pm6.00am12.00am 6.00pm 12.00am


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12 midnight 12 noon 12 midnight


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24 HOUR CLOCK


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The 24-hour system uses 4-digit number

to express time

08 15

Hour Minute

24-HOUR SYSTEM


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Time before 12 p.m. (noon)Time before 12 p.m. (noon)

9.00a.m.

9

Add 0 in front

To change to time in 24-hour

system

Ignore the dot

in the 12-hour system

Time In 12 hour System

. 00

09 00

CONVERTING TIME FROM THE 12CONVERTING TIME FROM THE 12--HOUR SYSTEMHOUR SYSTEM

INTO THE 24INTO THE 24--HOUR SYSTEMHOUR SYSTEM


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Given time is before 12 p.m. (noon)Given time is before 12 p.m. (noon)

5.30a.m.

Add 0 in front

to change to time in 24-hour

system

Ignore the dot



5 30

05 30



EXERCISE


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2.34 a.m.

11.05 a.m.

8.45 a.m

EXERCISE

.

0234

1105

0845


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Time after 12.00 p.m.Time after 12.00 p.m.

(until midnight)(until midnight)6.20p.m.

6

Add 0 in front

To change to 4-digit number

Ignore the dot



. 20

06 20

0600

1800Time In 24 hour System

Add 1200 + 1200


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Time after 12.00 p.m.Time after 12.00 p.m.

(until midnight)(until midnight)9.35p.m.

9

Add 0 in front

To change to 4-digit number

Ignore the dot



. 35

09 35

0935

2135Time In 24 hour System

Add 1200 + 1200


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Time After 12 p.m.Time After 12 p.m.

(until midnight)(until midnight)

7.24 p.m.

5.07 p.m.

11.38 a.m

EXERCISE

.

1924

1707

2338


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Time After 12 a.m. (until midday)Time After 12 a.m. (until midday)

2.34 a.m.

11.05 a.m.

8.45 a.m

EXERCISE

.

0234

1105

0845


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0830

8

Add a.m. behind to change

to time in 12-hour system

Place a dot between hours

digits and minutes digits .

Remove digit 0 in front of

the time in 24-hour system


. 30

8 .

CONVERTING TIME FROM THE 24CONVERTING TIME FROM THE 24--HOURHOUR

SYSTEM INTO THE 12SYSTEM INTO THE 12--HOUR SYSTEMHOUR SYSTEM

30 a.m.

0


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Time after 12 p.m. (until midnight)Time after 12 p.m. (until midnight)

2145

Place a dot between the hoursdigits and the minutes digits.

Remove digit 0 in front and place

the p.m. behind to change

to time in 12-hour system.

Minus 1200


9 .



45 p.m.

2145 1200 = 0945

0


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EXERCISEEXERCISE

1.1. Change each of the following to theChange each of the following to the1212--hour system.hour system.

1.1. 0640 =0640 = 2.2. 0930 =0930 =

3.3. 1530 =1530 = 4.4. 1950 =1950 =

5.5. 2035 =2035 = 6.6. 2345 =2345 =


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The conversion of timeThe conversion of time

1212--Hour systemHour system 2424--Hour systemHour system12.00 a.m.12.00 a.m. (Midnight)(Midnight) 0000 or 24000000 or 2400

1.00 a.m.1.00 a.m. 01000100

2.00 a.m.2.00 a.m. 020002003.00 a.m.3.00 a.m. 03000300

4.00 a.m.4.00 a.m.

5.00 a.m.5.00 a.m. 05000500

6.00 a.m.6.00 a.m. 06000600

7.00 a.m.7.00 a.m. 07000700

8.00 a.m.8.00 a.m.

0400

0800


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The Conversion of TimeThe Conversion of Time

1212--Hour systemHour system 2424--Hour systemHour system

9.00 a.m.9.00 a.m. 09000900

10.00 a.m.10.00 a.m. 10001000

11.00 a.m.11.00 a.m. 11001100

12.00 p.m.12.00 p.m. 12001200

1.00 p.m.1.00 p.m. 13001300

14001400

3.00 p.m.3.00 p.m. 15001500

4.00 p.m.4.00 p.m. 16001600

17001700

2.00 p.m.

5.00 p.m.


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The conversion of timeThe conversion of time

1212--Hour systemHour system 2424--Hour systemHour system

6.00 p.m.6.00 p.m. 18001800

7.00 p.m.7.00 p.m. 19001900

8.00 p.m.8.00 p.m.

9.00 p.m.9.00 p.m. 21002100

10.00 p.m.10.00 p.m.

11.00 p.m.11.00 p.m.

12.00 p.m.12.00 p.m. 24002400

2300

2200

2000


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ACTIVITYACTIVITY

http://www.bbc.co.uk/skillswise/numhttp://www.bbc.co.uk/skillswise/num

bers/measuring/time/timesanddates/bers/measuring/time/timesanddates/game.shtmlgame.shtml


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INTERVAL BETWEEN TWOINTERVAL BETWEEN TWO

TIMESTIMES

8.15 a.m. to 4.35 p.m.

3

8.15 a.m. 12.00 p.m. 4.35 p.m.

MinMinHourHour

8 20

hour45 min 4 hour25 min

SAME

DAY !

+


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TIMESTIMES

8.15 a.m. to 4.35 p.m.

12 hour system12 hour system 24 hour system24 hour system

4.35 p.m.4.35 p.m.

8.15 a.m.8.15 a.m. -

16351635

08150815

08200820

SAME

DAY !


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TIMESTIMES

10.25 a.m. to 2.40 p.m.


2.40 p.m.2.40 p.m.

10.25 a.m.10.25 a.m. -

14401440

10251025

04250425

SAME

DAY !

The interval time is 4 hours 25 minutes


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TIMESTIMES

11.10 a.m. to 8.05 a.m.NEXT

DAY !

-

+


2055

24002400

11101110

12501250

08050805

11.1011.10

8.058.05


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TIMESTIMES

6.45 a.m. to 9.20 a.m.NEXT

DAY !

-

+


2655

24002400

06250625

17351735

09200920

6.256.25

9.209.20


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EXAMPLESEXAMPLESTheThe flightflight fromfrom KualaKuala LumpurLumpur toto

KotaKota BharuBharu usuallyusually takestakes 5050minutesminutes.. IfIf aa flightflight isis scheduledscheduled totodepartdepart atat 07450745 isis delayeddelayed byby 3535minutes,minutes, atat whatwhat timetime willwill thethe planeplanearrivearrive atat KotaKota Bharu?Bharu?

07450745 + 0050 = 0835+ 0050 = 0835

07 4507 45

+ 00 50+ 00 50

08 3508 35

The plane will arrive at 08 35.


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AA moviemovie waswas startedstarted atat 20152015.. ItIt lastedlasted forfor

22 hourshours andand 1515 minutesminutes.. AtAt whatwhat timetime diddid

itit end?end?


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CREATED BYCREATED BY

PN ZARINA BT MAAROFPN ZARINA BT MAAROF

PN WAN ZAKIAH BT WANPN WAN ZAKIAH BT WANMUSTAPHAMUSTAPHA

PN CHYE SOO FUENPN CHYE SOO FUENPN CHEONG SHU LINPN CHEONG SHU LIN

PN ZAIMIRA JAILANIPN ZAIMIRA JAILANI

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Basic Measurements (Times)Form 1

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