Lesson video

Hello, my name's Miss Jones and I'm going to be teaching you maths today.

I'm going to start with a quick joke, are you ready? Why was the maths book sad? Why do you think a maths book might be sad? Go on, tell me what you think.

Shall I tell you? The maths book was sad because it had too many problems. Let's start today's lesson.

Today we're going to be measuring using millilitres Here's the lesson agenda.

We'll start with the new learning where we'll look at containers and think about whether we would measure them in the units of millilitres or litres.

And then we'll look further into the lesson at how we measure using millilitres.

There'll be a talk task followed by an independent task, and then finishing off with a post quiz.

You will need a pencil and some paper for today's lesson.

Please pause the video and collect these items if you haven't done so already.

Let's start with our lesson.

Here's a question for you.

What is capacity? Here there are some jugs to help give you a clue.

I'm going to pause while you think.

Go on, tell me what capacity is.

Great, capacity is the amount of liquid a container can hold.

All three of these containers are full to capacity.

They hold as much as they can hold.

What is volume? Here are some measuring jugs to give you a clue.

I'm going to pause while you have to think.

Go on, tell me, what is volume? Great job, volume is the amount or liquid or other substance that is in the container.

So all of these containers are not full to capacity.

We would measure the volume, the amount of liquid or substance that is inside them.

Now here's a task for you.

Can you arrange these containers in order of capacity? Pause the video whilst you think about this task.

Are you ready? Can you tell me which container you think has the greatest capacity? Interesting, which container do you think has the least capacity? Great job.

Now, it's important to remember when we're looking at looking at capacity that when a container is the tallest, it doesn't necessarily mean it has the greatest capacity.

To measure the capacity of these containers accurately, we would need to measure the amounts using millilitres or litres by measuring what's inside the containers, or most of these containers, that's been done already.

And they will say on them, how many millilitres or litres they hold.

Which unit would you use to measure the capacity of these containers? Millilitres or litres? I'm going to show you for these four containers below, as I do so I'm going to say this sentence out loud.

I would measure the in millilitres or litres because, and give my reason why and to help me with my reason, I filled up my measuring jug to one litre.

Let's start with the spoon.

I would measure the spoon in millilitres because it is less than one litre.

In fact, I think it's less than half a litre.

I would measure the bucket in litres because I think it is more than one litre.

To fill that bucket, I'm definitely going to be pouring more than one of these jugs.

And then for the swimming pool or the paddling pool, I would measure the pool or paddling pool in litres because to fill that pool it's definitely going to be more than one litre.

And then finally the mug I would measure in millilitres because I estimate that the mug is less than one litre.

Now it's time for your talk task! for your talk task today, I would like you to find which unit would you would use to measure the capacity of these containers.

Would you use millilitres or litres? As you do this, say the sentence out loud.

I would measure the in millilitres or litres because and your reason why.

Pause the video whilst you complete your talk task, click resume when you are ready.

Let's go through the answers.

First of all, the milk carton.

Do you think we'd measure the milk carton in millilitres or litres? Whisper it to the screen now.

Great job.

Now, it depends on the size of the milk carton.

If it's an individual milk carton we'd measure it in millilitres, but if it's a big family size milk carton we'd measure it in litres.

What about the watering can? Millilitres or litres, whisper it to the screen now.

Great, I would measure the watering can in litres because it holds more than one litre.

The egg cup.

Do you think we would measure in millilitres or litres? Whisper it to the screen now.

Great job.

I would measure the egg cup in millilitres because it holds less than one litre.

Finally, the water container.

Would you measure it in millilitres or litres? Whisper it to the screen now.

Great, I agree.

I would measure that big watering container in litres, because it definitely would hold more than one litre.

Now that we've looked at containers that we would use millilitres to measure the contents of the substance, the volume we're going to estimate where we would measure amounts on scales.

Here we are estimating where 550 millilitres is.

Let's look at the scales and the intervals, they are going up.

It is going up in, count with me, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000.

Did you notice what the scale's going up in? Go on, tell me.

Great job.

The scale is going up in 100's.

We need to find 550.

So here is 500 and 50 isn't marked on the scale.

So we've got to estimate where it is.

And I know that 550 is halfway between 500 and 600.

So the mark would be here for 550.

This is where I estimate the amount.

Now it's your turn.

Can you point to the screen where you would estimate 350 millilitres? I'm going to give you time to think.

Have you got it? Go on, point to the screen now.

Well done, 350 would be here between 300 and 400.

Now it's time for your independent task.

For your independent task today, write the volume of each container, the amount that there is inside in millilitres, then you've got some problems to solve.

Read the questions carefully, look at the items and then write your answers on for each question.

You could use bar models to help you.

Pause the video to complete your task.

Resume once you're finished.

Let's go through the answers.

In this first jug, there is 650 millilitres.

It is halfway between 600 and 700.

In this container, there is 900 millilitres.

It's exact, the line is exactly on 900.

In this container, it is on a mark that's not labelled, but we know the scale's going up in 100's and each mark is halfway between.

Half of 100 is 50.

There is 50 millilitres in this container.

And in the final container, it's halfway between 900 and 1000.

So there is 950 millilitres.

The bucket of water holds more than the water bottle.

The bucket of water holds 1000 millilitres and the water bottle holds 500 millilitres.

I know that two lots of the water bottle would fill the bucket.

This is because half of 1000 millilitres is 500 ml, therefore the bucket of water holds 500 millilitres more than the water bottle.

The capacity of the orange juice carton is, and it tells us here, 150 millilitres.

The orange juice carton when full, has a capacity of 150 millilitres.

The water bottle holds more than the orange juice.

The water bottle holds 500 millilitres and the orange juice holds 150.

The difference between these two amounts is 350 millilitres.

The water bottle holds 350 millilitres more than the orange juice.

Well done on the great lesson.

I hope you've enjoyed yourself and I hope to see you again soon, bye.