Lesson video

Hello there.

My name is Mr. Tilstone.

I'm a teacher.

I teach all of the subjects, but my favourite one just has to be maths.

So it's a great pleasure to be with you today, teaching you a lesson all about time.

Time can sometimes be quite a tricky concept, but don't worry.

With a nice positive attitude and good listening skills, you're going to be amazing and I'm going to guide you through it every step of the way.

So if you're ready, I'm ready.

So let's begin.

The outcome of today's lesson is I can convert from hours to minutes and from minutes to seconds.

Our keywords are, my turn, seconds, your turn.

My turn, minutes, your turn.

And my turn, hours, your turn.

Those are very common words.

I'm sure you've heard them lots of times before, but let's have a little reminder about what they mean.

Seconds are a short standard unit of time and 60 seconds are equal to one minute.

See if you can remember that because that's going to be useful today.

Minutes are a standard unit of time.

Minutes are shown by the long hand on an analogue clock.

There are 60 minutes in an hour.

That's another key fact that's going to be used today.

And hours are a standard unit of time.

There are 24 hours in a day.

Hours are shown by the shorthand on an analogue clock.

Our lesson today is split into two cycles.

The first will be convert from hours to minutes and the second, convert from minutes to seconds.

So if you're ready, let's start by converting from hours to minutes.

In this lesson, you're going to meet Sofia and Jun.

Have you met them before? They're here today to give us a helping hand.

The minute hand is always moving around the clock, not this quickly.

But how many minutes are there in one hour? Well, the clock is split into 12 sections, just like you can see there.

That's one of the sections.

Each of them is five minutes in length.

So can you see the little tiny blocks? There's five of them in that section and there's 12 sections together.

12 times five equals 60.

So 60 minutes in one hour.

Jun is baking a large fruitcake, but he has a problem.

The recipe says to bake for 120 minutes, but look what happens after 59 minutes on my oven timer.

So Jun's got a timer on his oven.

You might have one on your oven at home as well.

So this is showing that 59 minutes have gone by.

But look what happens next.

Can you see a little problem? It displays hours and minutes, but Jun's recipe was just in minutes.

Sofia has got a similar problem.

I want to watch a movie.

It says the runtime is 130 minutes, but I'm going to a party in two hours.

Have you ever seen that on the back of a DVD or on a streaming platform or anything like that? It tells you in minutes how long a film is.

But she's going to a party in two hours.

I'm not sure if I've got time to watch the movie.

Jun and Sofia need a way to convert between minutes and hours.

So have a look at the clock.

There's an analogue clock and that's showing one hour has passed.

So that purple section shows you that the minute hand's gone all the way around the clock once.

So that's 60 minutes.

So a full hour has passed on this clock or 60 minutes.

Now we've got two hours.

That's 120 minutes because 60 plus 60 equals 120.

Counting in steps of 60 is easy if you know how to count in steps of six.

Is that something you can do? Can you count in sixes? So here we've got three hours have passed.

How many minutes will that be do you think? There's a little clue.

Look at the numbers.

The six has been highlighted in purple and the 12 in purple.

So six, 12, 18, so that's 180 minutes.

This is four hours.

What's going to come next do you think? Counting in sixes.

Six, 12, 18, 24.

So that's 240 minutes.

Five hours? Six, 12, 18, 24.

What comes next when you're counting in sixes? 30.

So how many minutes would that be? 300.

What about six hours? Six, 12, 18, 24, 30.

What's next? 36.

So that's 360.

Seven hours.

What's going to come next? Six, 12, 18, 24, 30, 36, 42.

So that's 420 minutes.

And eight hours.

Six, 12, 18, 24, 30, 36, 42.

What comes next? 48.

That will be 480 minutes.

So eight hours is exactly the same as 480 minutes.

So let's go back to Jun's problem.

So the recipe said he needed to bake the cake for 120 minutes, but that's the same as two hours.

There are 60 minutes in one hour.

So 120 minutes is equal to two hours.

So that's what he needs to put on his timer.

Two hours.

The recipe says to bake for 120 minutes.

So I need to set my timer for two hours And Jun says I can apply my six times tables knowledge to help me here.

So just like we were counting in six, we can use our six times table as well.

So one hour is 60 minutes.

So if mm times six equals mm then mm times 60 equals mm.

Will you say that stem sentence with me please? If mm times six equals mm, then mm times 60 equals mm.

Now just you say it, off you go.

Let's practise.

So if one times six equals six, then one times 60 equals 60.

What about two? Two hours? Well, if two times six equals 12, then two times 60 equals 120.

What about three? I can use that stem sentence for three.

If three times six equals 18, then three times 60 equals 180.

What about four hours? If four times six equals 24, then four times 60 equals 240.

What about five hours? Let's use that stem sentence.

If five times six equals 30, then five times 60 equals 300.

What about six hours? If six times six equals 36, then six times 60 equals 360.

What about seven hours? If seven times six equals 42, then seven times 60 equals 420.

So if you're good with your six times tables, it's quite easy to convert from hours to minutes.

So we've got that stem sentence again.

Let's do a check.

Use the stem sentence to convert nine hours into minutes.

Pause the video.

Let's have a look.

If nine times six equals 54, then nine times 60 equals 540.

So nine hours is 540 minutes.

We didn't need to start counting from six or 60, did we? We could go straight to using our times tables.

Nine hours equals 540 minutes.

Have a look at this combination of clocks this time.

So the first one's showing 60 minutes passing and the second one, five minutes passing.

How long is that time interval? And can you express it in two different ways? We've got another stem sentence here that is mm minutes or mm hours and mm minutes.

So what do we think? Start by thinking how many minutes you can see.

Well I can see 60 on the first clock and five on the second.

60 add five equals 65.

What about how many hours and minutes? Well I can see one full hour.

So that's one hour.

And how many minutes? Five.

So 65 minutes is one hour and five minutes.

What about this one? How many hours can you see? How many minutes can you see? And before that, just how many minutes can you see? Well, 60 minutes on the first clock.

15 on the second.

60 plus 15 equals 75.

What about the combination of hours and minutes? How many hours can you see there? One.

So that's one hour.

How many minutes? 15.

So 75 minutes is the same as one hour and 15 minutes.

What about this one? Let's do the minutes first.

So how many minutes can you see altogether there? I can see 60 and 30.

That makes 90.

What about how many hours and how many minutes? Well full hours, that's one again.

And how many minutes? 30.

So 90 minutes is one hour and 30 minutes.

What about this one? Well, I can see 105 minutes because 60 minutes and 45 minutes equals 105.

Or again, one hour, look.

And how many minutes? 45.

So 105 minutes is one hour and 45 minutes.

Ooh, a little change this time.

There's more than one full hour.

What can we see here? How many minutes to start with? Well, let's add them together.

You could see 60, add 60 and six add six might be a helpful starting point for that.

So 60 plus 60 plus five.

What does that equal? That's 125.

So we can see 125 minutes or how many hours and how many minutes? How many full hours? Two.

How many minutes on top of that? Five.

So 125 minutes is two hours and five minutes.

What about this one? Start with the minutes.

So we've got 60 plus 60 plus 30.

That equals 150 or how many full hours? Two.

How many extra minutes? 30.

So 150 minutes is two hours and 30 minutes.

Let's do a check.

Express this time interval in two different ways.

So first of all, how many minutes can you see? And then how many hours and minutes can you see? Pause the video.

How did you get on? Let's have a look.

So starting with the minutes then, we need to add together all of those minutes.

So 60 plus 60 plus 60 plus 30 and that gives us 210.

And I used six plus six plus six plus three as my starting point there.

And hours and minutes, well, I can see three full hours and I can see 30 extra minutes.

So 210 minutes is three hours and 30 minutes.

And if you got that correct, very well done.

You are on track in today's lesson.

Let's return to Sofia's problem.

So remember she wants to watch a movie and it says the runtime is 130 minutes but she's going to a party in two hours.

She wants to know if she can watch the movie first.

So Jun says, I know that 120 minutes is two hours.

So 130 minutes is two hours and 10 minutes.

Sorry, Sofia, you won't have time to watch all of the movie.

Maybe she can watch the end when she comes back from the party.

So the number of minutes can be partitioned into a multiple of 60 plus the extra minutes.

Let's have a look at some examples.

For example, 150 minutes can be partitioned into 120 minutes because that's a multiple of 60 and 30 minutes.

The 120 minutes is two hours.

So 150 minutes is two hours and 30 minutes.

Let's have a look at that.

There's your two hours or 120 minutes and there's your extra 30 minutes.

So that makes 150 minutes.

If you know how many minutes there are in different hours, you can use that knowledge as a starting point to convert minutes into hours and minutes.

Let's do some examples.

So we've got a table.

Minutes, the minutes partitioned, so split into that multiple of 60 and the extra minutes and then how many hours and minutes that is.

So 130 minutes, right? Think about multiples of 60.

Counting in 60s, how far can you get? You can get to 120.

Then how many extra minutes are left? 10.

So that number partition is 120 plus 10.

So those 120 minutes, how many hours is that? That's two.

So that means that's two hours and 10 minutes.

Shall we do another one? A hundred minutes, right.

Counting in 60s, how many 60s can you do? Just one.

So that's 60 plus 40 minutes left.

So 100 becomes 60 plus 40.

How many hours is 60 minutes? One hour.

So that's one hour and 40 minutes.

Let's do another 200 minutes.

Okay, so we need a multiple of 60 just before that.

So 60, 120, 180.

That's the closest I can get.

And there's 20 minutes left.

So that becomes 180 plus 20.

Right, how many hours is 180 minutes? Three.

How many extra minutes? 20.

So that's three hours and 20 minutes.

Hopefully you're starting to get this a little bit, but let's do a couple more.

135.

So this time it's not a multiple of 10, it's a multiple of five.

Okay, but counting in 60s, what can we get to? 60, 120 and then what's left? 15.

So that's 120 plus 15, that number partitioned.

How many hours is 120 minutes? It's two plus 15 minutes extra.

One more.

110 minutes.

How close can we get in terms of multiples of 60? Just one.

So that's 60, but what's left? 50.

So 110 minutes is 60 minutes and 50 minutes.

How many hours is 60 minutes? One.

What's left? 50 minutes.

So that's one hour and 50 minutes.

Sofia saw that one a bit differently though.

She saw it as 120 minutes, take away 10 minutes 'cause it was really close to 120 or two hours take away 10 minutes.

That's clever, Sofia, but it still gives the answer one hour and 50 minutes.

I think Sofia made it a bit easier for herself there.

So well done.

Let's have a check.

So we've got all those examples there as a reminder.

You're going to do one more.

Use partitioning to convert 150 minutes into hours and minutes.

Pause the video and give that a go.

How did you get on? Let's have a look.

So 150 minutes partitioned.

So in terms of multiples of 60, we can go 60 ,120.

So that's 120 and what's left? 30.

So that becomes 120 plus 30.

How many hours is 120 minutes? It's two.

So that's two hours and 30 minutes.

Well done if you got that.

It's time for some practise.

Number one, how many minutes are equal to four hours? And there's a little reminder there.

Little prompt.

Number two, complete the table.

So we've got hours on the left, minutes on the right, fill in the gaps please.

Number three, express these time intervals in two different ways.

So how many minutes are there and how many hours of minutes are there? And number four, complete the table.

We're going to use that partitioning skill.

So the first one's been partly done for you, 125 minutes.

That's 120 minutes plus five minutes.

So finish it off, fill in the gaps.

Good luck with that, pause the video and I'll see you soon.

Welcome back.

Let's give you some answers.

Let's check against your answers.

So number one, how many minutes are equal to four hours? That's 240 minutes and you can see there, 60, 120, 180, 240 And completed the table.

One hour is 60 minutes, two hours, 120 minutes, three hours, 180 minutes.

And then going the other way, 240 minutes is four hours.

Now maybe using our times tables.

So our eight times six to turn it into eight times 60, that is 480 minutes and then 10 hours, that's a little easier to do because 10 times six is 60.

So 10 times 60 is 600, and then the other way around, 660 minutes is 11 hours.

So well done if you got those.

And expressing these times in two different ways, the first one is 100 minutes or one hour and 40 minutes, and the second one is showing 135 minutes or two hours and 15 minutes.

And completing the table, we've got 125 minutes.

That's partitioning to 120 plus five, which means it's two hours and five minutes.

The next one you have to do the partitioning yourself.

So that's 180 plus 30, that's three hours and 30 minutes.

190, that's 180 plus 10.

That's three hours and 10 minutes and 170, that's either 120 plus 50 making two hours and 50 minutes.

Or you might have seen it a bit like Sofia saw it earlier on and you might have thought of it as 180 minutes, take away 10 minutes or three hours, take away 10 minutes, but it still gives you two hours and 50 minutes.

You're doing really well so far.

I think you're ready for cycle B and that is converting from minutes to seconds.

As well as having an hour hand and a minute hand, some clocks have a hand showing seconds.

Have you noticed that? And on this clock, it's this one.

Often they're in red, in this one it's not, it's black.

The hour and minute hands moves so slowly that it's very hard to see them moving at all.

But the second hand moves so quickly that it can be seen moving.

So if you've got a clock with a second hand on, you can see it moving all the time.

On some clocks, it moves in one smooth continuous movement and on some clocks it jumps from one second to the next like this.

The minute scale on a clock does two different jobs.

It can be used to show how many minutes have passed after each hour using the minute hand, but its second job, it can also be used to show how many seconds have passed each minute using the second hand.

So let's count around the clock in steps of five seconds.

So if you're good at counting at five, you're going to be good at this.

Are you ready? Five seconds, 10 seconds, 15 seconds, 20 seconds.

Are you counting with me? 25 seconds, 30 seconds.

35 seconds, 40 seconds, 45 seconds, 50 seconds, 55 seconds, 60 seconds and 60 seconds equals one minute.

And that's a really important fact that's going to help you today.

Jun and Sofia are timing each other to see how long it takes them to run around the field at Oak Academy.

Jun measured Sofia in seconds and it took her 125 seconds, pretty quick.

Sofia measured Jun in minutes and seconds.

It took him two minutes and 10 seconds.

So can you see they measured each other in slightly different ways.

The first just in seconds and the second in minutes and seconds.

So we perhaps need to convert them so that they're the same.

And that will help us to answer the question, who was quicker? Is 125 seconds quicker or is two minutes and 10 seconds quicker? The times are in different units at the moment.

It would be easier to compare if they were both in seconds or both in minutes and seconds.

So it doesn't really matter which, but converting them will be easy.

So let's have a look at this image.

A full minute has passed on this clock or 60 seconds.

Does that remind you of anything? Hmm, it does me.

I feel like we've seen something very similar to that before.

That's one minute or 60 seconds.

And Sofia's noticed it too.

She says this is the same number of minutes in an hour.

I wonder if we can use the same counting and times table skills.

So in cycle one we were counting in sixes and 60s and using our six and 60 times tables.

I wonder if we can do the same.

So this is two minutes.

What's coming up next do you think? 120 seconds.

This definitely feels familiar, doesn't it? So just like before, counting in steps of 60 is easy if you know how to count in steps of six.

So three minutes is 180 seconds, four minutes, 240 seconds.

These are the same numbers as before, aren't they? Five minutes is 300 seconds.

Six minutes is 360 seconds.

Seven minutes is 420 seconds and eight minutes is 480 seconds.

Just like before says Jun, I can apply my six times tables knowledge to help me here.

And we've got that stem sentence again.

If mm times six equals mm then mm times 60 equals mm.

So one minute is 60 seconds and that stem sentence says if one times six equals six, then one times 60 equals 60.

What about two? If two times six equals 12, then two times 60 equals 123.

If three times six equals 18, then three times 60 equals 180.

Four, if four times six equals 24, then four times 60 equals 245.

Five, if five times six equals 30, then five times six equals 300.

Six, if six times six equals 36, then six times 60 equals 360.

Seven, if seven times six equals 42, then seven times 60 equals 420.

It's just like before, isn't it? So let's do a quick check.

We're going to use that stem sentence again.

If mm times six equals mm, then mm times 60 equals mm.

So use that stem sentence to convert 12 minutes into seconds.

Pause the video.

How did you get on? If 12 times six equals 72, then 12 times 60 equals 720.

12 minutes equals 720 seconds and well done if you got that, you are on track.

Just like before, you can express this time interval in two different ways.

We're going to change the stem sentence slightly though.

This time is mm seconds or mm minute and mm seconds.

So have a look.

Let's start with the seconds.

How many seconds can you see there? I can see 60 and I can see five.

And together that makes 65.

And it's the same calculations as before.

Sofia's right.

65 seconds or how many minutes? One minute.

And how many extra seconds? Five seconds.

65 seconds is one minute and five seconds.

What about this one? 75 seconds or one minute and 15 seconds? Jun measured Sofia in seconds.

It took her 125 seconds and Sofia measured Jun in minutes and seconds and it took him two minutes and 10 seconds.

That's just a reminder.

Now let's see if we can turn them into the same thing.

So you could say Sofia took two minutes and five seconds or you could say it took Jun 130 seconds.

But either way you can see that Sofia was quicker by five seconds.

So converting them was really helpful.

The number of seconds can be partitioned just like before into a multiple of 60 plus the extra seconds.

For example, 155 seconds can be partitioned into 120 seconds and 35 seconds.

The 120 seconds is two minutes.

So 155 seconds is two minutes and 35 seconds.

Here we have it.

There's two minutes or 120 seconds and there's your extra 35 seconds making 155 seconds or two minutes and 35 seconds.

If you know how many seconds there are in different minutes, you can use that knowledge as a starting point to convert seconds into minutes and seconds.

So let's do some practise.

130 seconds partitioned is 120 plus 10, that's two minutes and 10 seconds.

100 seconds partitioned, you might recognise some of these numbers by the way is 60 plus 40 or one minute and 40 seconds.

200 seconds.

So think about your multiples of 60.

180 plus 20.

That's three minutes and 20 seconds.

135.

Multiples of 60 again please.

What can we get to? That's 120 with 15 left.

So 120 plus 15, which is the same as two minutes and 15 seconds.

And 110 seconds.

That's 60 plus 50 and that is one minute and 50 seconds.

So it's very similar to what we did earlier on.

And Sofia, she's clever at this kind of thing, isn't she? She noticed that the last one was like 120, subtract 10 or two minutes, take away 10 seconds.

It still gives the answer one minute and 50 seconds, but I think it was a bit easier.

Let's have a check.

Use partitioning to convert 150 seconds into minutes and seconds.

Pause the video.

What did you get? So thinking about our multiples of 60, we can go 60, 120.

That's as close as we can get.

So 120 plus 20.

And then how many minutes is that? That's two minutes and 20 seconds.

Well done if you got that.

It's time for some more practise, some final practise.

So number one, how many seconds are equal to three minutes? And you've got a visual reminder there.

Number two, complete the table, fill in the gaps.

Number three, express the time intervals in two different ways, just like before.

And number four, complete the table using partitioning.

Pause the video.

Best of luck and I'll see you soon for some feedback.

Welcome back.

How did you get on? How many seconds are equal to three minutes? 180 seconds.

So 60, 120, 180.

Complete the table.

One minute is 60 seconds, two minutes is 120 seconds, four minutes is 240 seconds.

300 seconds is five minutes.

Nine minutes is 540 seconds Using our times table skills here, you might notice.

11 minutes is 660 seconds and 720 seconds is 12 minutes.

Number three, express the intervals in two different ways.

The first one is 105 seconds, which is one minute and 45 seconds.

And the second one is 150 seconds or two minutes and 30 seconds.

And completing the table using that partitioning skill, we've got the first one, 85 seconds, that's 60 and 25, which is one minute and 25 seconds.

Second one, 60 and 40.

That's one minute and 40 seconds.

The third one, 180 and 20, that's three minutes and 20 seconds.

And the last one, 60 plus 50, that's one minute and 50 seconds.

But you might have been clever like Sofia and thought of it as 120 take away 10, which I think is a bit easier, but it still gives one minute and 50 seconds.

We've come to the end of the lesson.

Today's lesson has been converting from hours to minutes and minutes to seconds.

There are 60 minutes in an hour, that key fact, and we can use this fact to say that there are 120 minutes in two hours, 180 minutes in three hours, and so on and so on.

Times expressed in just minutes can be expressed in minutes and hours.

Likewise, times expressed in minutes and hours can be expressed in just minutes.

There are 60 seconds in a minute.

And all of this is true when converting between seconds and minutes.

You've been amazing today, you've made so much progress and you've got some really great new skills.

So well done.

I think give yourself a little pat on the back.

It's been a real pleasure working with you today and I hope I get the chance to spend another lesson with you in the future.

But until then, take care.

Enjoy the rest of your day and bye-bye.