Powerpoint is an introduction to 24 hour time

1. 24 Hour Time Learn which of these numbers are telling you about time ! 24 Hour time - Activity 1 1

2. 24 hour time 12 hour time 24 Hour time ‘names’ each hour. 2 24 Hour time - Activity 1

3. Two important things to know about 24 hour time…… 24 hour time uses numbers only to show the time. 24 hour time does not use am or pm. 24 Hour time - Activity 1 3

4. Defence forces Who would use 24 hr time ? 24 Hour time - Activity 1 4

5. ETA means Estimated Time of Arrival Unit 4 – report ETA at base camp ETA at base camp is 14:30 hours 24 Hour time - Activity 1 5

6. Who would use 24 hr time ? Transport companies 24 Hour time - Activity 1 6

7. Discuss these ideas with your teacher, write some sentences about how 24 hour is different from 12 hour time. write a sentence about where 24 hour time is used. then in your exercise book: 24 Hour time - Activity 1 7

8. Communicating and understanding Look at the two next slides and talk about what has happened….. 24 Hour time - Activity 1 8

9. The tide is good for fishing at 7 o’clocktomorrow. I’ll pack a torch ! 24 Hour time - Activity 1 9

10. The tide is good for fishing at 0700 tomorrow. Great- early in the day is the best time ! 24 Hour time - Activity 1 10

11. Using 24 Hour time stops confusion ! Look back at the slides showing who uses 24 hour time…. Discuss: Why is that the best way of communicating time for them ? 24 Hour time - Activity 1 11

12. Where do you see 24 hr time ? Tide times in the newspaper. 24 Hour time - Activity 1 12

13. Tide times Think about how the tides go in and out all day every day, never stopping. The times for high tides and low tides change everyday. Lots of people plan to go fishing at the best times – the best times are at the change of the tide. The change of tides can happen during the day or during the night. Question Why do you think it is a good idea to have the times written in 24 hour time ? Answer Using 24 hour time is a good way to show the tide times because …. 24 Hour time - Activity 1 13

14. Where do you see 24 hr time ? Travel timetables – eg buses, planes, trains 24 Hour time - Activity 1 14

15. Think: Which circle of numbers shows 12 hour time ? Do you understand why there are two different numbers around the outside of the circle ? 24 Hour time - Activity 1 15

16. Use the clock face to convert the following times: 24 Hour time - Activity 1 16

17. Language of time 12 hour time / 24 hour time digital analog timetable / calendar (middle) midnight / midday = noon am = first 12 hours of the day pm = next 12 hours of the day h = hours min = minutes notation = way of writing something down – the writing ‘style’ you use convert / conversion = change 24 Hour time - Activity 1 17