1. Intermediate 1Unit 2 Outcome 2 Speed Distance Time 8 Lessons S D T

2. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa Revision of time Revise previous work on time By the end of this lesson you will 1. Convert 12hr to 24hr clock 2. Convert 24 hr to 12hr clock 3. Count Method to find time intervals S D T

3. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa There are two major ways to show the time: "AM/PM" or "24 Hour Clock". With the 24 Hour Clock the time is shown as how many hours and minutes since midnight. AM/PM the day is split into the 12 Hours running from Midnight to Noon (the AM hours) the other 12 Hours running from Noon to Midnight (the PM hours). S D T

4. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa What Day is Midnight? Midnight has another problem - there is nothing to tell you "is this the beginning or ending of the day". Imagine you are told your friends are leaving on holiday at "midnight" on 12th March, what day should you arrive to say goodbye? Do you get there on the 11th (assuming they leave at the very start of the 12th), or the 12th (assuming they leave at the end of the 12th)? It is better to use: 11:59 PM or 12:01 AM, or 23:59 or 0:01 (24-Hour Clock) which the railroads, airlines and military actually do S D T

5. 230022002100200019001800170016001500140013001200 11 pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday 110010000900080007000600050004000300020001000000 11 am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: Examples 9 pm becomes 11 pm becomes 5:30 pm becomes 10:30 pm becomes 3:40 pm becomes 1:10 pm becomes 15 40 17 30 21 00 23 00 22 30 13 10 Intermediate 1Unit 2 Outcome 2 S D T

6. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: Example 1 2.30 am0230 Example 2 6.30 pm1830 Add 12 to the pm hours No ‘am’ or ‘pm’ in the answer a)4 pm b)6.15 pm c)7 am d)8.45 am e)10.30 pm j)12.15 pm k)1.11 am l)7 am m)11.45 am n) 9.30 pm f)Midday g)1.10 pm h)11.55 am i) 10.05 pm 0) 10.05 am p)4.20 am q)3.35 pm r) 9. 45 pm 1600 1815 0700 0845 2230 1200 1310 1155 2205 2415 0111 0700 1145 2130 1005 0420 1535 2145 S D T

7. 230022002100200019001800170016001500140013001200 11 pm10 pm9 pm8 pm7 pm6 pm5 pm4 pm3 pm2 pm1 pmmidday 110010000900080007000600050004000300020001000000 11 am10 am9 am8 am7 am6 am5am4 am3 am2 am1 am midnight 12/24 Hour Clock 11 17pm 3 30 pm 6 pm 1 pm 2 09 am 4 50pm To go from 24 hour clock to 12 hour clock just subtract 12 from the hours if it is greater than 12: Examples 18 00 becomes 13 00 becomes 15 30 becomes 02 09 becomes 23 17 becomes 16 50 becomes Intermediate 1Unit 2 Outcome 2 S D T

8. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa To go from 12 hour clock to 24 hour clock just add 12 to the pm hours: Example 1 03153.15 am Example 2 20108 10 pm Any time after 1200 is pm time ‘am’ or ‘pm’ must be in the answer a)0230 b)0805 c)1640 d)0245 e)1805 j)1020 k)1430 l)2240 m) 1935 n) 1800 f)1200 g)0545 h)2315 i) 0020 0) 0925 p)1425 q)1955 r) 0635 2 30 am 8 05 am 4 40 pm 2 45 am 6 05 pm Midday 5 45 am 11 15 pm 12 20 am 10 20 am 2 30 pm 10 40 pm 7 35 pm 10 20 am 9 25 am 2 25 pm 7 55 pm 6 35 am S D T

9. Intermediate 1Unit 2 Outcome 2 Speed Distance Time Convert from am/pm to 24 hours and vice versa What do you see?