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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
in the 12-hour system
Time In 12 hour System
5 30
05 30
CONVERTING TIME FROM THE 12CONVERTING TIME FROM THE 12--HOUR SYSTEMHOUR SYSTEM
INTO THE 24INTO THE 24--HOUR SYSTEMHOUR SYSTEM
EXERCISE
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Time before 12 p.m. (noon)Time before 12 p.m. (noon)
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
in the 12-hour system
Time In 12 hour System
. 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
in the 12-hour system
Time In 12 hour System
. 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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Time before 12 p.m. (noon)Time before 12 p.m. (noon)
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
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
Time In 24 hour System
9 .
CONVERTING TIME FROM THE 24CONVERTING TIME FROM THE 24--HOUR SYSTEMHOUR SYSTEM
INTO THE 12INTO THE 12--HOUR SYSTEMHOUR SYSTEM
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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INTERVAL BETWEEN TWOINTERVAL BETWEEN TWO
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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INTERVAL BETWEEN TWOINTERVAL BETWEEN TWO
TIMESTIMES
10.25 a.m. to 2.40 p.m.
12 hour system12 hour system 24 hour system24 hour system
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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INTERVAL BETWEEN TWOINTERVAL BETWEEN TWO
TIMESTIMES
11.10 a.m. to 8.05 a.m.NEXT
DAY !
-
+
12 hour system12 hour system 24 hour system24 hour system
2055
24002400
11101110
12501250
08050805
11.1011.10
8.058.05
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INTERVAL BETWEEN TWOINTERVAL BETWEEN TWO
TIMESTIMES
6.45 a.m. to 9.20 a.m.NEXT
DAY !
-
+
12 hour system12 hour system 24 hour system24 hour system
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