Time What units do we use to measure
- Slides: 26
Time
What units do we use to measure time? How many can you think of?
millennium month second decade hour day century week year fortnight Can you put these units of time into order – starting with the smallest?
second minute hour day week month year decade century millennium
Some of these times are analogue times and some are digital. Can you convert them?
half past two 2: 30
quarter past eight 8: 15 Hang on a minute – morning or evening? How do we show morning or evening?
quarter past eight in the morning 8: 15 am
twenty past one in the afternoon 1: 20 pm
quarter to ten at night 9: 45 pm
five past six in the morning 6: 05 am
11: 15 am quarter past eleven in the morning
3: 10 pm ten past three in the afternoon
6: 25 pm twenty-five past six in the evening
3: 35 am twenty-five to four in the morning
The twenty four hour clock works in a different way. When we use the twelve hour clock, we split the day up into two lots of twelve. There are two times each day when it is half past two, five past three and so on. We use am or pm to show which one is which.
The twenty four hour clock splits the day into 24 hours. The day starts at midnight which is written as 00: 00. Five past twelve (midnight) is written as 00: 05 One o’clock in the morning is 01: 00, so five past one is 01: 05
12: 00 am 00: 00 1: 00 pm 13: 00 1: 00 am 01: 00 2: 00 pm 14: 00 2: 00 am 02: 00 3: 00 pm 15: 00 3: 00 am 03: 00 4: 00 pm 16: 00 4: 00 am 04: 00 5: 00 pm 17: 00 5: 00 am 05: 00 6: 00 pm 18: 00 6: 00 am 06: 00 7: 00 pm 19: 00 7: 00 am 07: 00 8: 00 pm 20: 00 8: 00 am 08: 00 9: 00 pm 21: 00 9: 00 am 09: 00 10: 00 pm 22: 00 10: 00 am 10: 00 11: 00 pm 23: 00 11: 00 am 11: 00 12: 00 pm 00: 00 12: 00 noon 12: 00 pm 12: 00
Write these times as 24 hour clock times:
half past two in the afternoon 14: 30
five past seven in the morning 07: 30
nine o’clock in the evening 21: 00
ten past four in the afternoon 16: 00
half past two in the afternoon 14: 30
quarter to five in the evening 16: 45
Twenty five past one in the afternoon 13: 25
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