Lesson video

Hello guys, and welcome to our fifth lesson of measuring and comparing capacities in mixed units.

And we are going to be focusing on millilitres and litres as we have in our previous lesson.

So let's begin.

Okay, before we start, let's look at our lesson agenda.

We will be looking at different containers to prove how millilitres are related to litres.

Second part of the lesson will be rehearsing the language of mix units for volume, and then we're going to to be ready for independent task and then followed by our answers.

Which I'm sure you guys will be ready for.

Okay, so as always, you will need a pencil, a rubber and an exercise book to complete your task I have for you.

Okay, so let's start off with this activity.

Out of all these items, which ones do you use to measure length, mass, or volume? I'm going to give you about one minute and you can decide.

Okay, let's see if we got it correct.

So we're going to go with length.

So let's see we got, we should have gone with a ruler, well done.

We should have gone with the measuring tape, and we should have gone with a measuring wheel.

Okay? These are normally going to be using centimetres metres, millimetres kilometres.

These are the type of units would use for length.

All right, let's move on to the mass.

How do we do mass? We had the goods, the weighing scales, okay, we have another set of weighing scales to measure our bodies.

Okay, we also had a little cup when we're adding a bit of flour into our delicious cakes that we make at home.

Therefore the volume will be our container as it is there, and also what we call this a syringe, okay? It's used to measure really small quantities of liquid.

Okay, really good guys.

It's so important to be able to distinguish between the three, land, mass and volume.

Okay guys, before we start any practical work, it's just very important to tell you that you must be safe when you're using any equipment at home.

Not doing it by yourself, and you must have an adult present with you at all times.

Especially when you're dealing with a high volume of water, you want to make sure that the area around you is safe, Okay? And that again, adult should be with you at all times.

Awesome, safety first.

Okay so, as mathematicians, we are now going to prove that 1000 millilitres equal to one litre.

And we're going to start small.

So we're going to start with this container right here, which is used to measure 100 millilitres of water.

And we're going to see how many of those fit into this container, which is equal to 500 millilitres of water.

Before I start pouring it in, just take a second, and I'd like you to estimate, how many hundred millilitres will fit into this 500 millilitre water.

Okay, let's try it.

Okay, so we know then, that five one hundreds, make 500 millilitres.

Now what we're going to do is, we're going to use this one litre bottle, Okay? Now I would like to estimate, how many, hundred millilitres, is it going to take, to fill this one litre bottle.

Have a second to guess, and then we're going to find out.

So there we go.

We know that it's took 10 100 millilitres, to fill this bottle of one litre.

So we now know, we've proved, that it takes 10 100 millilitres, to make 1000 millilitres.

Well ran guys.

Okay mathematicians, we're now going to use this 1000 millilitre container, as you can see here, okay of water.

And what we're going to do is we're going to show you that, both of these, as we know, contain one litre or 1000.

This is 1000 millilitres, or one litre, and this is 1000 millilitres or one litre.

Now this, is a two litre bottle.

Now, according to what we have been saying, that one litre is equal to 1000 millilitres, this container, plus this bottle, both equal to 1000 millilitres each, should be able to fit in there.

We're going to prove that, that is correct.

Are we ready? Let's go.

And as I mentioned in the beginning, we need to make sure that we are being very careful.

If you were doing this at home, then make sure you're being really safe with your area and you're with an adult.

If not, I'll be very careful myself.

Let's go.

1000 millilitres, is going to go into this two litre bottle.

Let's have a look.

Okay, we're halfway there, and can we say that there's about half of the bottle left? Let's find out.

Here we go.

The next one, I'm going to pull this one litre bottle, back into this container so then it's easier.

Okay.

1000 millilitres.

Let's have a look.

Okay, so I can say, that, 2000 millilitres is equal to this two litre bottle.

Now I know some of you may be thinking, "Why is it not all the way to the top?" Now, whenever you get one of these bottles, they never fill it to the top.

Because otherwise when you open, it'll spill all over the place.

So this is exactly 2000 millilitres, which we know is equal to how many litres? Two litres.

What a mathematician.

We did really good work today.

If the people that work with this room at home, while done.

Hopefully this has proved, that 1000 millilitres is equal to one litre.

Well, how can we measure litres and millilitres to measure more accurately? So we can use litres to millilitres to measure more accurately, by measuring and mix units.

That means that we're not just going to be looking at just litres, and just millimetres, we're going to be putting them together.

Just like we did with mass, when we did kilogrammes with grammes.

So, we are going to now start rehearsing the language of mixed units for volume.

So here's an example.

Right here we have two cartons of orange juice, and we have three glasses.

Now each carton is equal to one litre, and each glass, as you can see there, is equal to 100 millilitres.

Now, what's important is, that we can never add litres and millilitres together.

So I couldn't do one litre, plus 100 millilitres, is 101 millilitres litres.

You cannot do that, that's a big No.

Okay? You can say one litre, and 100 millilitres, is one litre, and 100 millilitres.

So make sure we did not add the numbers together, if they are different units.

So let's begin.

This is the language we'll start with.

There are two one litre cartons, and some 100 millilitre glasses of juices.

So the volume of the juice, is greater than two litres, but less than three litres.

And then we have little Suzie come along and say, "Well, that is one litre, two litres, and 100, 200, 300 millilitres.

Therefore the volume of the juice is about, two litres, and 300 millilitres." And that is what we're going to be rehearsing today.

Now we need your help to answer the next one.

Here we go.

First thing we say, there are one litre cartons, and 100 millilitre glasses.

So always acknowledge, how much each container can hold.

So the carton holds one litre, and the glasses hold 100 millilitres.

So there are two one litre cartons, and some 100 millilitre glasses of juice.

So the volume of juice, is greater than, what is it going to be greater than? How many litres greater than? Two litres, good.

But less than, three litres.

Good.

So we know that, it's in between two litres, and three litres, okay? Okay, Suzie comes along.

That's A, so are we ready? We're going to count this together.

One litre and two litres.

Should we count? Ready? 100, 200, 300, 400, 500 millilitres.

Therefore the volume of the juice, is about, are we going to say, or two litres plus 500, 502 millilitre litres.

Is that the answer? No.

Remember, we did not add the numbers if they have different units.

Therefore we have two litres, and 500 millilitres.

Now it's time for you guys to have a go.

What is the total volume? I want us to follow those steps.

Remember, first acknowledge what is the capacity of each container, then you're going to count them out.

And do we add litres and millilitres together? No we don't.

Pause the video now and then come back.

Alright guys, so what is the total volume? So let's start again.

So first, acknowledge what is in each container.

So, I know that there is one litre in the chocolate milk carton, and I know that there is 100 millilitres of chocolate milk inside each glass.

So then, I know that it is more than, one litre, but less than, two litres.

Good.

Alright, so now we're going to have Suzie reminding us how we do this.

And then Suzie says, "Okay, so there is one litre, of chocolate milk and 100, 200, 300 millilitres of chocolate milk in the glasses.

Therefore all together, we should have one litre, and 300 litres of chocolate milk." What's that you say? Absolutely.

That is a mistake, I did that on purpose.

Seeing if you guys are listening, it is 1 litre, and 300 millilitres of chocolate milk.

Right, well done guys, really good work.

It's time for the independent task.

Okay, I need your help.

As always, you guys have been helping me so much in the last lessons.

You're so reliable, let's go.

Let's keep on going.

We have milk, a yoghourt drink, and chocolate milk.

I need your help.

I need to find out, what they measure in mix units.

So that's litres and millilitres.

Your task, if you choose to accept it, is to find out what they are, make sure you follow those steps to get to your answer.

I can't wait to see how you got on.

Right guys, go to your worksheets and then come back.

I'll be waiting here.

Right guys, you're back.

Here we go.

I really want to know how much milk there is left milk.

So that is how many litres of milk in a carton? One litre of milk in a carton.

There is, should we count together, 100, 200, 300, 400, 500 millilitres of milk in the glasses.

Therefore there is, do we add the litre and millilitres together? No we don't.

Good.

One litre and 500 million litres of milk all together.

Well, if you got that correct.

If it doesn't look like mine, fix it now please.

Let's go to the next question.

All right, here we go yoghurt drink, Love it.

It's strawberry flavoured as well, my favourite.

So what do we do first, acknowledge how many litres are in each container.

So the cartons, there are How many? Two litres of yoghurt cartons, really good.

And there is, should we count, 100, 200, 300, 400 millilitres of yoghurt in the glasses.

Therefore, there is, do we add litres and millilitres together? No.

Therefore, there is two litres, and 400 millilitres of yoghurt.

Well done guys.

If it doesn't look like mine, fix it now.

We're going to go into the next one.

left the best for last, love chocolate, Love it.

Chocolate milk even better.

Right, what will be first? There are one litre, two litre, three litres of chocolate milk cartons.

There is, 100, 200, 300, 400, 500, 600 millilitres of chocolate milk in the glasses.

Therefore there is, three litres and 600 millilitres of chocolate milk.

Thank you so much guys for your help today.

You guys have worked very, very hard.

So happy, thank you.

I hope you guys have really learned from today's lesson.

And anything you don't understand, go back and see if you can try again.

Thank you.