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# Understanding 24 hour time

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Grade 5 lesson (mathematics)

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### Understanding 24 hour time

1. 1. UNDERSTANDING 24 HOUR TIME Class 5F
2. 2. 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].
3. 3. HARRY RECEIVES A TEXT FROM HIS MUM: “15:10?” He wonders. “What does that mean?” Fink, 2013a. [Image file].
4. 4. THERE ARE 24 HOURS IN A DAY…
5. 5. 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). Kahlai, 2011. [Image file]. 24 hour time is useful in military, travel and medical industries to avoid confusion.
6. 6. 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: • FoundationsA, n.d. [Image file]. 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
7. 7. UNDERSTANDING 24- HOUR TIME • Watch the video → • Upon completion, return to this presentation for next steps. FutureSchoolVideos. 2011. [Video file.] SOLA Optical, n.d. [Image file.]
8. 8. 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].
9. 9. 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!
10. 10. FLIGHT TIMETABLE – FILL IN THE MISSING PIECES! Flight #1: Flight #3: • Departure time: 11:00 • Departure time: 23:45 • Flight duration: 3.5 hours • Flight duration: 0.75 hours • Arrival time: _____ • Arrival time: ______ Flight #2: Flight #4: • Departure time: 15:15 • Departure time: 22:45 • Flight duration: 2.25 hours • Flight duration: ______ • Arrival time: ______ • Arrival time: 00:15 (the next day)
11. 11. FLIGHT TIMETABLE – FILL IN THE MISSING PIECES! Flight #5: • Departure time: _____ • Flight duration: 2.5 hours • Arrival time: 13:30 Flight #7: • Departure time: 10:45 • Flight duration: ______ • Arrival time: 12:30 Flight #6: • Departure time: ______ • Flight duration: 1 hour 15 minutes • Arrival time: 16:00 Flight #8: • Departure time: ______ • Flight duration: 2 hours 30 minutes • Arrival time: 19:15
12. 12. 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].
13. 13. WELL DONE!
14. 14. 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-imageshappy-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