﻿Hi, everyone. I'm Miss Hill, and today we are going to be converting between 12-hour and 24-hour clocks. So before we begin, let's put on our hats, tighten our ties, and tell the computer, now I'm a mathematician. Now, another fun rhyme we can use when telling the time is this one. Hopefully, you know this one. If not, follow along with me. What's the time? What's the time? What's the time? What's the time? What's the time? What's the time? Now, I always like to start my time lessons off with this little song, so hopefully you enjoyed it too. Before we begin our lesson, let's have a look at our lesson agenda. First off, we're going to be looking at what's the same? What's different? Before doing some exploring. We're then going to be doing, what might you be doing at this time? Before moving on to your independent tasks. But before we begin this lesson, you need to make sure you have the following resources with you; a pencil, a piece of paper, and a ruler. If you need to get any of these things, please pause the video now to go get them. Great job. Let's get started. So here we have two times, but what's the same and what's different? While looking at these times, I can see the same thing is it that they're both showing 45 minutes. But the hours are funny. One is six and one's 18. So that's what's different. The hours are different, but the minutes are the same. Well in fact, they're actually showing the same time. So how many hours are there in the day? Well, we know that there are 24 hours in a day. We can measure time either by using a 12-hour clock, or a 24-hour clock. On a 12-hour clock, if it's six o'clock, how do I know if it's morning or afternoon? Well, luckily they include an AM, which is the 12 hours from midnight to noon, so our mornings. So AM is morning. And PM is the 12 hours from noon to the midnight, so the afternoon. So PM is the afternoon. So repeat after me. AM, morning. PM, afternoon. AM is? PM is? AM? PM? Well done. These are really, really important things to make sure they stick in your brain. So here we have a 12 and 24-hour clocks for a day length. We have midnight, which is 00. One in the morning, 01. Two in the morning, 02. You can see all the way it goes up, until it gets to noon. So noon is 12 o'clock. So 12 o'clock on the 12-hour clock and 12 o'clock on the 24-hour clock. Now this is when it goes a little bit funny. So normally it will continue on one, two, three, four, five six, seven, eight, nine, 10, 11, 12. On a 12-hour clock, it does do that. And it tells us p.m. after it. However, on a 24-hour clock, it continues going up. So we have 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and then it resets to 00. So that's how I look at that again. So here we have our 12-hour, cause you can see it goes one, two, three, four, five, six, seven, eight, nine, 10, 11, 12. And that will all be followed by p.m. in the afternoon. However, our 24-hour clock goes from 13 all the way up to 23 and it will reset at midnight at 00. So the 24-hour clock shows how many hours have passed since midnight. So we don't need to use a.m. or p.m. So here are some times. If I wake up at 7:15 a.m. and 07:15, are they the same time. Yes, they are the same time. But which one is the 12-hour clock and which one's the 24-hour clock? Well I know if there's a.m. that's a big clue. So that's my 12-hour clock. And my 07 is my 24, as you can see here. So if I eat my tea at 7:15 p.m. or 19:15, which one is 12-hour's and which one's 24? Can you point to the 12-hour clock? Well done. And the other one must be 24-hour cook. If I eat my lunch at noon, now this is very interesting cause they look the same. The way that we know that this is a 12-hour clock is that we have the p.m. So p.m. is the afternoon. Hopefully I'm asleep at midnight, but this is our 12:00 AM. And this one? Does this one look correct? No, because it goes back to our 24-hour clock, so it should be 00. I thought I tried to trick you with that one. So what you need to do is to match the 12-hour and 24-hour clocks here. So what you need to do is to pause the video and match the 12-hour and 24-hour clocks. Great job everybody. Let's have a look at these answers. Here, we can see 2:45 a.m. is the same as 2:45. Please make sure you ticking along. 13:30 is the same as 1:30 p.m. 12:30 p.m. is the same as 12:30. 6:15 p.m. is the same as 18:15. 16:45 is the same as 4:45 p.m. 9:30 a.m. is the same as 9:30. 00:30 is the same as 12:30 a.m. 8:15 a.m. is same as 8:15. Great job everyone give yourselves a one, two, three, well done me. Great job. So, here we have the time 09:30. What might you be doing at this time? Pause the video and have a think. What might I be doing? Well, at 09:30 in the morning, well, I usually be teaching or I might be really cheeky on the weekends, having lying, so I might be waking up at this time. So here we have it on our digital clock and our analogue clock. So our minute hand is pointing to the half past. How about this one? The bit trickier. Pause the video, have a go. See your good job. So this time is 18:15 and using my 24 and 12-hour clock, I can see that 18 is the same as 6:00 PM. So it's 6:15 PM. Usually at 6:15 PM, I might be watching the Simpsons or I might be eating my dinner. So 6:15 PM is the same as 18:15 PM. And this is what it looks like on our analogue clock. My hour hand is pointing to the six and the minute hand is pointing to the 3 or 15 minutes past. Ooh, tricky, tricky, tricky. What about this one? Have a think. 12:30. 12:30, let's have a look. Oh, 12. And what's going to be 24-hour? So it's going to be 12 down here. So it's 12:30 or 12:30 PM. So you can see our minute hand is pointing to the six or half past, and this hour hand is pointing to the twelve. Now, usually at 12:30 PM, I might be eating my lunch. 00:30. Now this is the one I tried to trick you with earlier. 00:30. 00:30. Have a think. I know that 00:30 is the same as midnight. So it's half past twelve at night. That is not 12:30 PM, it's 12:30 AM. So my clock, it looks the same. And at 12:30 AM hopefully we're all fast asleep. So now it's your time for your independent task. As you can see on the left-hand side you had been given the digital clock. You need to draw the hands on the analogue clock and circle, is it a.m. or is it p.m.? On this side, you've been told if it's a.m. or p.m. And you've been given the analogue time. So you need to write it correctly in the 24-hour clock. Pause the video and see you shortly. Great job, everybody. Let's go through these answers together. Well, the first one is 2:38. So here I have my hour hand pointing to and our minute hand pointing to 38, and it's the am. If it was in the afternoon, it would be 14:38. Here we have 00:40, so I know that 00 is twelve, and it's twelve at midnight and 40 minutes past 12, and it's a.m. Thirdly, we have 8:12. Now this I know is going to be twelve minutes past eight in the morning. Well done. Let's have a look at these ones together. So here I have just pointing before quarter past or 15 minutes past and my hour hand is pointing there. So it's 16:14, if it was am, it would be 4:14 but because it's PM, it is 16:14. My second answer, I can see it's AM. Therefore the answer is 9:55. Be careful, it's not quite pointing to the ten. It's just before the ten. And last but not least. I know my answer's in the afternoon and it's pointing just before the three. So that's going to be half past two, or 14:30. Great job everyone. You've been super duper stars today. If you'd like to, please ask your parent or carer to share your work on Instagram, Facebook, or Twitter tagging @OakNational and #LearnwithOak. See you again soon for more learning about time. Take care.

2:30 pm on a 24 hour clock would be

17:15 on a 12 hour clock would be

00:20 on a 12 hour clock would be

12:45 pm on a 24 hour clock would be

What could I be doing at 20:45?

Converting time between 12 and 24 hour clocks

In this lesson, we will convert time between 12 and 24 hour digital clocks.

Maths

Y4 Maths

Key Stage 2

Year 4

Miss

Reading, writing and converting time between 12 hour and 24 hour clocks

Time

Number

THEME

UNIT

Reading analogue and digital 12 hour clocks

Converting between hours, minutes and seconds

Converting between years, months and weeks

Solving word problems with time

1 hour in minutes

1 minute in seconds

3 hours in minutes

198 minutes in hours

24 months in years

9 weeks in months

365 days in years

Lesson overview:Reading, writing and converting time between 12 hour and 24 hour clocks

Core Content

Time: