# 24 Hour Clock - Ms. Cariati's Class Site

24 Hour Clock Grade 6 Math There are 24 hours in a day! The first 12 hours of the day are from: Midnight Midday Think, Pair, Share What places use a 24 hour clock? In 12 hour time We count from midnight to midday Then we count from midday to midnight!

Count the hours in the day 1,2,3,4,5,6,7,8,9,10,11,12 1,2,3,4,5,6,7,8,9,10,11,12 In 24 hour time we count from... 1 to 24! 1,2,3,4,5,6,7,8,9,10,11,12, 13,14,15,16,17,18,19,20,21,22,23,24! We dont use AM or PM in 24 hour clock!

1 am 2am 3am 4am 5am 6am 7am 8am 9am 10am

11am 12 noon 01:00 02:00

03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 11:00 12:00 For PM times we keep counting to 24!

1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm

11pm 12 midnight 13:00 14:00

15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 24:00 / 00:00 Look at Midnight! 12:00 00:00 midnight Why???

Its a new day Midnight is the very beginning of the new day. We have counted a full 24 hours The day is over so we start counting again from zero! 1,2,3,4,5,6,7,8,9,10,11,12, 13,14,15,16,17,18,19,20,21,22,23,24! What about the minutes?

In 24 hour time the minutes dont change. 1.15am 01:15 2:45am 02:45 6:24pm 18:24 8:30pm 20:30 10:45am 10:45 11:35pm 23:35 Noon & Midnight

Noon 12:00pm 12:15pm 12:30pm 12:45pm 12:50pm 12:05pm 12:10pm 12:00

12:15 12:30 12:45 12:50 12:05 12:10 Midnight 12:00am 12:15am

12:30am 12:45am 12:50am 12:05am 12:10am 00:00 00:15 00:30 00:45 00:50 00:05 00:10 Telling Time... If its 10:00PM, what time is it on the 24 hour clock?

If its 19:00 what time is it on the 12 hour clock? Telling Time up to the Second We use a similar method when telling time up to the second. For example, on a 24 hour clock, 10:18:28 means that 18 minutes and 28 seconds is after 10 a.m. How many second have passed after 6 p.m.? 6:42:06

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