# Lesson video

In progress...

Hello, everybody.

I'm Miss Charlton and this is my special talk partner Hedwig, all ready for some exciting Maths learning with you today.

But if not, you could have a special friend, a cuddly toy, a bit like Hedwig to help you as well.

Now, sometimes Hedwig gets a bit sleepy during the lesson, and she falls asleep.

But don't worry, we'll wake her up at the end and we'll tell her all about what we've learned today.

Maybe you can help me with that.

Let's get started and see what we're going to be doing.

So today, we are going to be describing and classifying 3-D shapes.

We'll go through the descriptions of the shapes, and then we're going to classify them, that means put them in order in different categories depending on what their properties are, then you're going to do an independent task and then your end of lesson quiz.

You'll need a pencil and some paper if you want to draw the shapes, otherwise, you can use the pictures of the shapes provided.

Let's start off with a brain teaser and I don't know about you, but I need to get my brain warmed up.

So I can see I've got some cubes here, and some number bonds.

Let's look clearly at those.

Now the first picture, I can see that there are 10 cubes all together and there are six blue cubes.

There's a number six representing those six blue cubes.

So what's the missing part? The whole is 10, the parts are six and, can you tell me? Let's see.

Four, well done.

What about the next one? The whole is 10.

I can see that I've got seven blue squares, and three red squares.

The parts are three and seven.

3 + 7= 10.

Then the next one down the whole list is ten.

The parts are eight and I've got eight blue squares, How many red cubes are there? Two.

Eight and two.

Then the whole is 10.

The parts are nine and, one.

Well done.

9 + 1= 10.

And then the last one, the whole is 10.

Oh, the parts are zero and I've got zero red cubes, how many blue cubes are there? There are 10 blue cubes.

10 + 0= 10.

Well done, I feel really warmed up now, I hope you do too.

Let's get through our star words.

Hands up star words.

Face.

Vertices.

Edge.

Those are the words you're going to need in today's lesson.

First, we're going to explore a cube.

Now here is a cube.

Can you see the picture as well? This is a cube.

A cube is a type of cuboid.

It's got six faces.

Let's count them carefully together.

You ready? I'm going to hold this cube still and see if we can count them together.

Let's go for the top first, ready? One two three four five six.

Can you see how I held the cube still? And then I counted the opposite sides, because that makes it easier for me to remember which ones I've counted and which ones I haven't because it's quite tricky.

You sometimes miss them out.

Let's go again.

One on the top two three four five six.

It's got six faces.

They are flat faces, six flat faces.

What shape are these faces? Can you see that? What shape is that? I can see that all of the sides are equal length.

That shape is a? Can you tell me? It's a square, well done.

The faces are squares.

So it's got six faces, flat faces that are all squares.

Now I need to look at these pointy bits in the corners.

Now these corners, we are mathematicians so we call them vertices.

Can you say that? Vertices.

Well done.

Let's count how many vertices it's got.

I'll hold it still again.

One two three four, four on the top five six seven eight, eight on the bottom, four on the top and four on the bottom is equal to eight.

It's got eight vertices, one, two, three, four five, six, seven, eight eight vertices all together.

Right, so I've counted the faces and I can see that they're flat and I said that they're square.

I've counted the vertices, the corners, but there's something missing.

What's missing? Have a little think.

What can you see that's missing on here? What's that? Let's see.

That's right, it's an edge.

We missed counting the edges.

But what is an edge? Now you might have seen these edges on tables, you might have seen edges on doors.

Now often, I bump into edges when I'm rushing about and give myself bruises on those sharp bits near the corners, near the vertices.

But what actually is an edge? An edge is where two faces meet, where they meet together.

Let's see how many edges we've got on a cube One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve.

There are 12 edges on a cube.

It's where all of the flat faces meet.

12 edges on a cube.

Now it's your turn, you're going to look in more detail just like we did at the cube.

Now I want you to have a look to see how many faces the cube has got, what shape are the faces, how many vertices and how many edges.

Now, this is a cuboid.

You could use something like a shoe box to help you count or you use the picture in front of you.

Can you see if you can figure it out? Let's look.

How many faces? You have a think and I'm going to have a think as well.

What do you think it is? How many faces, can you tell me? Should we check together? One, two, three, four, five, six.

Six faces.

Did you get the same answer? Oh, that's the same as the cube.

Let's check that.

Have we got that right? Yes, six faces.

Now my question is, what shape are the faces? So let's have a look at this shape.

Ah, but that shape is different.

What shape is this one and What shape is this one? Let's have a look.

Oh, I can see that the sides are all straight and it's got a flat face and the sides are all of equal length.

So the shape must be a square.

Now let's check this one.

Well, it's got a flat face again, and it's got four straight sides.

But this time, the sides are not of equal length, are they? So this shape must be a rectangle.

Now let's check the vertices together.

Remember the vertices are the corners.

One, two, three, four, five, six, seven, eight.

It's got eight vertices.

Now the edges, that's the last one we learned about.

How many edges has it got? Remember the edges are where the flat faces meet.

Do you think you can have a look? Have a little think.

I'm going to count them as well.

How many edges? How many do you think it has? Did you get 12? Let's see.

I did, should we count them together? One, two, three, four, four edges on the top, five, six, seven, eight.

Don't forget the ones around here.

Nine, ten, eleven, twelve.

12 edges.

You did so well there, with looking at your cuboid in detail.

I think we need a bit of a celebration for that.

Shall we have a fan-tastic.

Can you do that? Fan-tastic.

Well done.

Now we're going to try and classify them.

So we're going to put them into groups.

Now in front of you, you can see on the screen that we've got one group that says it is a cuboid and another that says is not a cuboid.

So we have to think about all of the properties that we just talked about with our cuboid and decide if the shapes that we can see are cuboids are not cuboids.

So let's have a look in more detail.

Now I can see one shape in front of me that I know, I definitely know what it is.

That one is a cuboid.

Look, it's just like the shape that we just saw, all of the properties.

What about this shape? Is that a cuboid? We know it's not because it doesn't have flat faces all the way around, it doesn't have any vertices, we know that it's got a curved surface.

So that is not a cuboid, it's a cylinder.

So we need to put it in the group, not a cuboid.

What about the sphere? That one is not a cuboid either, because it doesn't have any vertices, it doesn't have any flat faces, and it doesn't have any edges.

So that is not a cuboid.

What about the pyramid? The pyramid, does that have any vertices? It does and it has flat faces.

But does it have the same number of flat faces? No, it doesn't.

It doesn't look anything like a cuboid.

So we put that in the group, not a cuboid.

What about the cone, the one that looks like an ice cream cone upside down? Does that have any flat faces? It's got one on the bottom.

Doe it have any vertices though? Does it have any vertices like a cuboid? No, and I can see that it's got a curved surface.

So that couldn't be a cuboid either.

So we need to put that in the group, not a cuboid.

What about the cube? I told you at the start of the lesson that the cube was a special type of cuboid, but let's double check to be sure.

I can see it's got flat faces, it's got one two, three, four, five, six flat faces, the same number as the cuboid.

It's got the same number of vertices, and it's got edges as well.

So that one is a cuboid.

You have got two different groups, you need to sort these shapes into the ones that have a curved surface and the ones that have no curved surface.

So you need to look very carefully at the pictures and you put them into the groups.

Now you can use the pictures that are provided if you want to, or you can draw your own shapes into the groups.

Pause the video now and then come back and we'll check together.

Have fun exploring.

How did everybody get on? Did you get the same answers as me? Let's have a look at the curved surfaces.

I can see that the cone has a curved surface, I can see that the sphere has a curved surface, remember that was a continuous curved surface, and the cylinder has a curved surface.

But the cuboid, the cube and the pyramid do not have curved surfaces.

Really well done everybody, great learning.

If you enjoyed today's lesson and you want to share your work with Oak, you can do so using the hash tag below.

Now go ahead and complete the quiz.

But just before you do remember, we've to wake up Hedwig.

She's been so sleepy.

Everyone say, "Wakey wakey Hedwig." Oh, there she is.

She's a tired, tired owl today.

Now what did we learn in today's lesson? What are the most important things that we need to tell Hedwig? Well Hedwig, we use the language of shape, so that we could describe the properties of different shapes.

For example, we learned the word edge, we know that that's the point at which two flat surfaces meet, flat faces meet.

And we use the word vertices as well, because we're mathematicians and vertices means corners.

And then we use that knowledge to classify the shapes into two different groups.

We decided which properties that they had, so that we could identify which shapes were similar and which were different.

Do you understand Hedwig? Do you think she understands? Let's see.

I think she does understand.

Really well done today, everybody.

Some great learning.

I'll see you again very, very soon.