UNDERSTANDING 24 HOUR TIMEClass 5F

WELCOME EVERYONE

Do you know what “24- hour time” means?

Today, you will navigate this presentation and you will learn to:• Convert 12- and 24- hour time systems.• Identify time differences between 12- and 24- hour systems.• Provide a written explanation of the different time systems. (Optional).

I am here to help you as always,

Mrs Fink.

Dreamstime, n.d. [Image file].

HARRY RECEIVES A TEXT FROM HIS MUM:

Fink, 2013a. [Image file].

“15:10?” He wonders. “What does that mean?”

THERE ARE 24 HOURS IN A DAY…

24 HOUR TIME SHOWS THE HOURS & MINUTES SINCE MIDNIGHT

A “24 hour clock” identifies the time without the use of AM/PM information that is used in a “12 hour clock”.(e.g.: 11:00am = 11:00).

24 hour time is useful in military, travel and medical industries to avoid confusion.

Kahlai, 2011. [Image file].

CONVERTING 12- & 24- HOUR TIMES

LOOK AT THE TABLE →To convert 12- hour to 24- hour time:

• If “AM” time – do nothing, simply ensure four digits are used.

(e.g. 6:00am = 06:00).

• If “PM” time - add “12”.

(e.g. 2:00pm = 2 + 12 = 14:00).

To convert 24- hour to 12- hour time:

• If time > 12, subtract 12 and note as “PM”.

(e.g. 15:00 (greater than 12) = 15 – 12 = 3:00pm).

• If time < 12, do nothing, simply ensure four digits are used.

(e.g. 9:30am = 09:30). *PRINT THIS PAGE

FoundationsA, n.d. [Image file].

UNDERSTANDING 24- HOUR TIME

FutureSchoolVideos. 2011. [Video file.]SOLA Optical, n.d. [Image file.]

• Watch the video →

• Upon completion, return to this presentation for next steps.

TIME TO PRACTICE

• Time to practice!

• Instructions: • Complete the practice questions →• Take your time & use your printed

page to guide you when necessary.

• Upon completion, “print screen” (results) and email to Mrs Fink before returning to this presentation. (http://www.outlook.com).

More Than a Sunday Faith, 2013. [Image file].Mathopolis. (2013). [Web quiz].

YOUR TASK

• An airline timetable is missing key information!

• Using what you have learned today, calculate the missing pieces of information.

• Use Word, Excel or PowerPoint to present your findings. Present all times in 12 and 24 hour time.

• Email to Mrs Fink. http://www.outlook.com

• The next two slides have the information you need for the task!

FLIGHT TIMETABLE – FILL IN THE MISSING PIECES!

Flight #1:

• Departure time: 11:00

• Flight duration: 3.5 hours

• Arrival time: _____

 

Flight #2:

• Departure time: 15:15

• Flight duration: 2.25 hours

• Arrival time: ______

 

Flight #3:

• Departure time: 23:45

• Flight duration: 0.75 hours

• Arrival time: ______

 

Flight #4:

• Departure time: 22:45

• Flight duration: ______

• Arrival time: 00:15 (the next day)

Flight #5:

• Departure time: _____

• Flight duration: 2.5 hours

• Arrival time: 13:30

 

Flight #6:

• Departure time: ______

• Flight duration: 1 hour 15 minutes

• Arrival time: 16:00

 

Flight #7:

• Departure time: 10:45

• Flight duration: ______

• Arrival time: 12:30

 

Flight #8:

• Departure time: ______

• Flight duration: 2 hours 30 minutes

• Arrival time: 19:15

FLIGHT TIMETABLE – FILL IN THE MISSING PIECES!

IF YOU HAVE TIME…

• Harry is confused. How would you explain 24- hour time to him?

• Write a short paragraph and email to Mrs Fink. http://www.outlook.com

Fink, 2013b. [Image file].

WELL DONE!

REFERENCES (RESOURCE)Australian Curriculum and Assessment Reporting Authority. (n.d.). Mathematics. Retrieved 21 December 2013, from http://www.australiancurriculum.edu.au/Mathematics/Curriculum/F-10#level2

Dreamstime. (n.d.). Stock images: Happy smiley cartoon face. [Image file]. Retrieved 29 December 2013, from http://www.dreamstime.com/stock-images-happy-cartoon-smiley-face-image2268974

Fink, V. (2013a). iPhone message. [Image file]. Received via email, 24 December, 2013.

Fink, V. (2013b). iPhone message. [Image file]. Received via email, 24 December, 2013.

FoundationsA. (n.d.). Lecon 4. [Image file]. Retrieved 24 December 2013, from

http://foundationsa.wikispaces.com/Lecon+4

FutureSchoolVideos. (2011). 24 hour time. [Video file]. Retrieved 26 December 2013, from http://www.youtube.com/watch?v=hBiCJt6B9Ow

Kahlai, T. (2011, 1 December). Time – AM/PM v 24-hour clock. [Image file]. Retrieved 24 December 2013, from

http://thoikahlai.blogspot.com.au/2011/12/time-ampm-vs-24-hour-clock.html

Mathopolis. (2013). Question 1. [Web quiz]. Retrieved 24 December 2013, from http://www.mathopolis.com/questions/q.php?id=3698&site=1&ref=/time.html&qs=3698_3699_3700_3701_3702_3703_3704_3705

More Than a Sunday Faith. (2013). Practice = preparation. [Image file]. Retrieved 26 December 2013, from http://www.morethanasundayfaith.com/2013/09/practice-preparation/

SOLA Optical. (n.d.). Summary. [Image file]. Retrieved 26 December 2013, from http://www.solahistory.com/contents.html