Lesson video

Hello everyone.

And welcome to maths with Mr. Dobrowolski.

Today's lesson is all about using standard units of measure.

So let's have a look at today's lesson agenda.

First step, we'll be learning about different standard units.

Then we'll be looking at litres.

Then we'll be looking at halves and quarters of the litres of a litre.

And finally, you'll be ready for your independent tasks.

For this lesson, you will need a pencil and notebook.

If you don't have these items, pause the video now and go get them.

Super, let's get started.

So my friend gave me a recipe for some cookies and I was really excited to bake them.

But for some reason, the cookies didn't turn out right.

It was so strange because she told me to measure all of the ingredients in cups.

Now, the cups in her house looked like this blue cup and the cups in my house looked like this pink cup.

Can you maybe spot the problem? Some of you may be thinking, oh, those are two different cups.

So they must be two different cup sizes, which is exactly the problem.

She told me to measure it in cups, but my cups were completely different from her cups.

So that's why it's really important that when we measure, we use a standard measure.

So for example, you may know the standard unit of measurement for length and mass.

If you do know them, pause the video and write them down.

Now, the standard unit of measurement for length is metres.

And the standard measurement of, the standard unit of measurement for mass is grammes.

We are obviously looking at volume and capacity.

So it's really important for us to know that the standard unit of measure for volume and capacity is a litre.

My turn, your turn, litre, super.

So what I'd like for you to do today is a little bit of an investigation.

Now it is super important that you ask an adult for help with this.

Because it involves you getting some items out of the kitchen.

So it's really, really important that you ask an adult for help.

But what I'd like for you to do is investigate.

Do you have any containers in your home that are equal to a litre, half a litre or a quarter of a litre? Let me show you how I did this investigation before you go off on your own.

So I have some containers here and I'm going to investigate.

Do they have a capacity greater than a litre, equal to a litre or less than a litre? Well, I found my kettle has a capacity that is equal to one litre.

And I know that because it's written right there, one litre.

So I'm going to fill up my kettle to the one litre mark.

And now I'm going to check, which of my containers has the capacity greater than one litre? Is it this small glass, this media measuring cup or this very large jug? So what I'll do is I'll pour one litre into what I think has a capacity greater than one litre.

If it still has room inside, if it still has capacity for more, I know that it's greater than its, that its capacity is greater than one litre.

So let's check.

Well, there we go.

I poured everything from my kettle, but I still have space, it still has capacity.

I know that this container holds more than one litre.

What about these other two? Do they hold more or less than one litre? Let's check, I'm going to fill my kettle again.

So I filled my kettle up to one litre.

What I'm going to do now is make sure I'm doing this over the sink so that it don't spill anything.

I think this container will have a capacity that is less than one litre.

So I start pouring.

Oh wow, it's overflowing.

But I still have, I still have liquid in here.

So that must mean this glass has a capacity that is less than one litre.

Oh, that was really messy.

Well, what I'd like to do now is check.

Does this have a capacity that's less than one metre? So again, I'll fill up to one litre.

Alright, and I'm going to start pouring.

Let's see what happens.

I think it's going to be a big mess.

I'm still pouring, I'm still pouring.

Oh, I'm spilling over, I need to stop, but I still have some liquid.

So that must mean that this measuring jug has a capacity, but it's a little less than one litre.

So I know that these two containers hold less than a litre, but saying that something holds less than a litre is not super accurate.

What I can do then is use my knowledge of halves and quarters to investigate, do these items hold half a litre or a quarter of a litre? I want to investigate if this holds half a litre.

How many halves are equal to a whole? Oh that's right, two halves are equal to a whole.

So if I can fill my kettle to one litre and fill this two times that must mean that this is equal a half a litre.

Half plus a half equal to a whole.

And so, I'm going to fill my kettle up to one litre mark.

Now let's see if I can fill this twice.

Remember to fill to the brim, otherwise this won't be a very fair investigation.

So count with me one.

Okay, great, I've got it to the brim.

So that's a half a litre and I've got it to the brim again.

That's another half.

Because I was able to fill this twice using one litre.

I know that this is equal to half a litre.

Now I want to check if this is equal to, if this has a capacity of a quarter of a litre.

Okay, so how many quarters are equal to a whole? That's right, four quarters are equal to one whole.

So if I fill my kettle again, my one litre kettle, I should be able to fill this four times using that one litre.

So let's try.

I filled my kettle up to one litre again.

So now I'm going to try filling this to the brim four times.

So count with me, one, that's one.

Two.

Three, we're so close and let's see if I'll fill a four.

That's right, I filled it four times.

I've used up all the liquid.

So that must mean this is equal to a quarter of a litre.

So now it's your turn to investigate.

Do you have any items that are, any containers that are equal to a litre, half a litre or quarter of a litre? Pause the video now, complete your investigation and I'll see you when you're finished.

Super, so you've all probably come up with loads of different containers and probably made quite the splash investigating that.

If you'd like to, you can share your work with Oak National by asking your parent or carer to share your work on Instagram, Facebook, or Twitter tagging @OakNational and #LearnwithOak.

As always, don't forget to complete your final quiz and make sure you clean up any messes you might have made in this investigation.

I really hope to see you for future lessons.

Bye.