Lesson video

Hello everybody.

My name is Mrs. Johnson.

I am so happy to be here today to help you with some of your maths learning.

I hope you are ready to work hard and have lots of fun.

Let's have a look at what we're going to be learning about today.

Today's lesson is called describe and name 3D shapes.

It comes from the unit shape.

Discuss and compare 2D and 3D shapes.

By the end of this lesson, you will be able to recognise and name cones, cylinders, cubes, cuboids, and spheres, and describe their properties.

I wonder if you recognise any of those shape names.

Maybe you've learned about them before.

I wonder if you can close your eyes and visualise what those shapes look like.

That means, can you see a picture in your mind of what these shapes could look like? There are five key words that are really important for this lesson.

We're going to practise saying them now.

It will be my turn first and then your turn.

Ready? My turn, cuboid.

Your turn.

My turn, cube.

Your turn.

My turn cone.

Your turn.

My turn, sphere.

Your turn.

My turn, cylinder.

Your turn.

Well done.

Listen out for those words today because they are going to be really important for what we are learning about.

(indistinct) Two parts to this lesson.

To begin with, you are going to learn how to describe 3D shapes and then in a little while you are going to learn to name 3D shapes.

Let's start with describe 3D shapes.

There are two friends in this lesson who are going to help you.

Their names are Lucas and Laura.

Listen carefully to the things that Lucas and Laura have to tell you because they are going to really help with your learning today.

Lucas has found some 3D shapes and Lucas says, I want to count the faces of these 3D shapes.

Oh, I wonder what that means, the faces, let's have a look.

A face is a flat surface on a 3D shape.

Lucas has had a good idea.

He says, I will put a sticky note on each face as I count to help me count the faces accurately.

Let's watch him put a sticky note on each face, so that he can count all the faces of this shape.

Ready? One, two, three.

Now Lucas says I need to rotate the shape to make sure I have counted all the faces.

Lucas has put a sticky note on all the faces he can see, but if he rotates the shape, if he turns the shape around, there will be more faces.

Let's have a look at that now.

Now that Lucas has rotated the shape, you can see another face he needs to count.

That's four.

Now he needs to rotate the shape again.

That's five.

When he rotates the shape again, all the faces are covered.

Now he needs to move the shape in a different way.

He needs to lift the shape up and he can see now there is another face that makes six.

This 3D shape has six faces.

Each face is a square shape.

That means that this shape has six square faces.

Let's have a look at another one.

Again, Lucas is going to put a sticky note on each face to help him count accurately.

One, two, three.

Now he needs to rotate the shape again like last time.

That's four.

Rotate again.

That's five.

When he rotates again it looks like all the faces have been counted, but if he lifts up the shape and looks underneath, there is one more, that's six.

This 3D shape has six faces.

Each face is a rectangle shape.

That means that this shape has six rectangular faces.

Now Lucas has chosen a different 3D shape.

He's going to use his sticky notes again to count the faces.

One, do you think he can put any more sticky notes on? Let's have a look.

Laura says this part of the 3D shape is not a face because it is a curved surface.

Do you remember the face is a flat part of a 3D shape, so this shape only has one face.

The face is a circle shape.

That means that this shape has one circular face.

Let's check if you can match the 3D shapes to their descriptions of their faces.

Pause the video and have a go at matching the descriptions to the shapes.

Good thinking everybody.

Let's have a look and see how you got on.

The first one says this shape has two square faces and four rectangular faces that matches this shape.

The second one has no faces and one curved surface.

That's this first shape here that has no faces because it has no flat part, and the last one says this has two circular faces and one curved surface that goes to the shape in the middle.

Well done if you match those up correctly.

Lucas has finished counting the faces on the 3D shapes now and he says, I wonder if there are any other properties I could count.

What do you think? Can you see anything on these 3D shapes that Lucas might be able to count? He's counted the flat parts, the faces.

What else could he count? Let's have a look.

Lucas says, I have noticed that there are corners on these 3D shapes.

They feel pointy when I touch them.

Maybe if you have some 3D shapes around you, you could feel them.

See if you can feel the corners that feel pointy when you touch them.

The corners on a 3D shape are called vertices.

Laura says that there are four vertices on the top and four vertices on the bottom.

One, two, three, four on the top.

Let's have a look underneath, one, two, three, four on the bottom.

That means that this 3D shape has eight vertices because four plus four is equal to eight.

Lucas has noticed that this 3D shape has some vertices too.

Those parts that feel pointy.

Let's see if Lucas and Laura can count the vertices again.

Laura has noticed that again, there are four vertices on the top and four vertices on the bottom.

One, two, three, four on the top.

One, two, three, four on the bottom.

That means that this 3D shape has eight vertices.

I wonder if they'd be able to count the vertices on this shape.

Lucas says, when I hold this shape, I can only feel one point.

There it is.

That means that this 3D shape has one vertex.

When there is only one, it's not called vertices.

That's when you have more than one.

When there is one on its own, it is called a vertex.

This shape has one vertex.

Let's check if you can count the vertices.

Do you think this is true or false? This shape has eight vertices.

Pause the video and have a think.

Oh, well done for thinking carefully about that.

Let's have a look.

There are four on the top and there are four on the bottom.

That means it is true.

This shape does have eight vertices.

Let's have a go at a different shape.

Is this true or false? This shape has no vertices.

Pause the video again and have a think.

Well done if you said that this one is true, this one has no corners because when you hold it there are no pointy parts.

You can't feel any points.

That means there are no vertices, so this one was true.

Now let's check that you know what a vertex is and what a face is.

Have a look at these arrows and then see if you can match up what each arrow is pointing to.

Pause the video.

Can you match the words to what those arrows are pointing to? Have a go now.

Let's have a look and see how you've got on.

The first arrow is pointing to a vertex.

That's a corner, isn't it? The second arrow is pointing to a curved surface and the last arrow is pointing to a face because that is the flat part of a 3D shape.

Well done if you match those up correctly.

Good job.

Lucas has finished counting the vertices of these shapes and he says, I wonder if there are any other properties I could count.

Is there anything else left? He has counted the faces and he's counted the vertices.

Can you see anything else on these shapes that he might be able to count? Hmm, I wonder.

Let's have a look.

Lucas says, I have noticed that there are straight lines on a 3D shape where the faces meet.

Did you notice those? The straight line where two faces meet on a 3D shape is called an edge.

Laura says it can be quite tricky to see all the edges when a 3D shape is solid like this.

She has an idea that's going to help you see the edges a little bit more clearly.

I wonder what she's going to do.

Let's have a look.

We're going to look at the same 3D shapes, but this time they are going to be built from straws and sticky tuck.

Here it is.

Laura says, now it's much easier to see all the edges.

Lucas says, there are four edges on the top of the shape.

There are four on the bottom and there are four around the middle.

Let's have a look at that.

There are the four edges on the top.

There are the four edges on the bottom and here are the four edges around the middle.

That means that this 3D shape has 12 edges.

Let's have a look at another 3D shape built from straws and sticky tack.

Lucas has noticed that again, like last time, there are four edges on the top, there are four edges on the bottom and there are four edges around middle.

That means that like last time, this 3D shape has 12 edges.

Now Lucas says, I'm not sure how to build this shape from straws and sticky tack.

Can you think about why Lucas might not be sure? Why might it be trickier to build this shape from straws and sticky tack? I think Laura has an idea.

Let's have a look.

Laura says, you cannot build shape with a curved surface from straws and sticky tack.

If a shape has a curved surface, the line where the curved surface meets the face is not an edge.

An edge needs to be a straight line, not a curved line.

That means that on this shape, this line here is not an edge because it is not a straight line where two flat faces join.

This 3D shape has no edges.

That's why it was tricky for Lucas to build with the straws.

If it doesn't have any edges, Lucas won't be able to make that shape because it doesn't have any straight lines.

Let's check that you can spot the edges on these shapes.

Which arrows are pointing to an edge? Here's the first one.

Here's the second arrow.

Here's the third arrow, and here is the fourth arrow.

Which arrows are pointing to an edge? Pause the video and have a go now.

Let's have a look and see how you got on.

The first arrow is not pointing to an edge.

This shape has got no faces.

If it has no faces, it can't have any edges can it? The second arrow is pointing to an edge.

This is a straight line where two flat faces meet, so it is an edge.

The third arrow is not pointing to an edge.

This is where a flat face is joining a curved surface, so it's not an edge.

The last arrow is pointing to an edge because this is a straight line where two flat faces meet.

This is an edge.

Well done if you were able to spot the edges there.

Now let's check if you can remember what a face, and a vertex, and an edge are.

You need to join two parts together to build each sentence so that it is correct.

You can see the second parts.

Now I'm going to show you the first parts and your job is to match them up correctly.

A face is the.

The edge of a 3D shape is the.

A vertex is the.

The second parts say, straight line where two faces meet.

Flat part of a 3D shape.

Corner of a shape where two or more edges meet.

Pause the video and see if you can match up the two parts together to make these sentences correct.

Let's see how you got on with your matching.

A face is the flat part of a 3D shape.

The edge of a 3D shape is the straight line where two faces meet.

A vertex is the corner of a shape where two or more edges meet.

Well done if you matched all of those up correctly.

Good job.

Now it's time for you to go and do a little bit of practise.

I would like you to use some straws and some sticky tack, or some play dough to try and build these 3D shapes.

Once you have built them, I want you to have a go at completing these sentences.

This shape has mm faces.

This shape has mm vertices.

This shape has mm edges.

You're going to do lots of counting to find out how many faces, how many vertices, and how many edges these shapes have.

Once you have finished making all three shapes and completing the sentences, think about what do you notice about the shapes that you have made and the sentences that you have completed.

Then I would like you to have a go at this question.

You are going to choose one of the 3D shapes from the box.

Then I would like you to tick all the statements that are true for the shape that you have chosen.

Then repeat, so choose a different shape and use a different colour for each shape that you choose.

Pause the video and go and have a go at that work now.

Off you go.

Well done everybody.

Let's see how you got on.

On question one, your shapes might have looked a bit like this, if you were building them from straws and sticky tack or play dough, this is how they should have ended up.

And your sentences should have looked like this.

This shape has six faces.

This shape has eight vertices.

This shape has 12 edges.

Did you notice like Laura did that the sentences were the same for all the shapes? Even though these shapes are different, the sentences were the same, weren't they? Did you notice what Lucas noticed? He needed to use different length straws to be able to build the last two shapes.

In the first shape, all the straws were the same length, but in the second and the third you needed some shorter straws and some longer straws didn't you? Well done if you noticed that.

I wonder if you noticed anything else.

Maybe you noticed that the shape of the faces wasn't always the same.

You must have been looking really carefully at your shapes to be able to notice those different things, so well done.

Let's have a look at the second question.

These are the statements that are true for the first shape.

Has no vertices.

Has a curved surface.

Has no edges and has no faces.

There should be four sentences for that first shape.

Then I chose the second shape.

Let's see which statements are true for this shape.

Has six faces.

Has square faces.

Has eight vertices.

Has 12 edges.

The next shape has only one face.

Has a circular face.

Has a curved surface.

Has only one vertex.

Has no edges.

There were five sentences for that one that you needed to tick.

The next shape has six faces.

Has eight vertices.

Has 12 edges.

There are only three sentences for that one.

And finally the last shape has no vertices, has a circular face.

Has a curved surface.

Has only two faces and has no edges.

Well done if you ticked the correct sentences for the shapes that you chose, you had to think really carefully to be able to do that, so well done.

Now it's time to have a look at the second part of our lesson.

You are going to learn how to name 3D shapes.

You know that these shapes all have the same properties.

Each shape has six rectangular faces.

Each shape has eight vertices.

Each shape has 12 edges.

These are the shapes that you made with your straws and your sticky tack, aren't they? Do you remember all the sentences were the same because they all had the same properties.

Laura says, does that mean that all these shapes could have the same name? Each of these shapes is a cuboid.

Laura was right.

These shapes do all have the same name.

Cuboids don't always look the same as each other.

Some might be taller, some might be wider, but these are all cuboids because they all have the same properties.

A cuboid always has six rectangular faces, eight vertices and 12 edges, just like the ones that you built from your straws and your sticky tack.

Let's just check if you can recognise a cuboid.

Which of these 3D shapes is a cuboid and how do you know? Do you think it's A, B or C? Pause the video and have a go now.

Start by looking at the ones that we know are not a cuboid.

I'm going to start with B.

I can see that B is not a cuboid.

I can also see that C is not a cuboid.

B does not have rectangular faces.

C is a 2D shape, it's a rectangle.

A cuboid is a 3D shape.

I know that B and C cannot be a cuboid.

That only leaves A, so now let me think about A, how do I know that A is a cuboid? A is a cuboid because it has six rectangular faces, eight vertices and 12 edges.

You know that all of these shapes are called cuboids.

Lucas says, I think I know a different name for one of these shapes, I wonder which shape he's talking about.

Can you see any of these shapes that you think you know a different name for? Hmm.

I wonder.

Let's have a look.

This is a cuboid, but it is also a cube.

Lucas was right.

This shape does have another name.

A cube is a special type of cuboid because all the faces are square.

Here are some more cubes.

All of these shapes are cubes because a cube always has six identical square faces.

That means six faces that are all the same.

They are all square shape.

To check if you can recognise that cubes are a special type of cuboid.

Here are some shapes that have been sorted into sets.

They are all in the cuboid set, but some of them are also in the cube set.

Can you see any shapes that might have been placed into the wrong set? Pause the video and look really carefully.

Well done for looking and thinking really carefully.

I noticed this one.

This shape has identical square faces.

This is a cube.

It belongs in the cube set.

I also noticed this shape here.

It does have a square face, but it also has some faces that are not square.

That means it's not a cube, it is a cuboid.

Well done if you notice those shapes.

Good job.

Now you have learned to recognise a cuboid and a cube.

Lucas wants to know if there are any other 3D shape names.

What are these other shapes called? We haven't learned the names of those yet.

Let's have a look.

I wonder if there's any you might already know.

Let's see.

This is called a cone.

Lucas can see that this cone has one vertex and one circular face and he's right.

A cone always has one circular face and one vertex.

A cone might not always look like this.

We could have different types of cones like these.

A cone doesn't always have to look the same, but it does always have to have one circular face and one vertex.

Let's have a look at another shape.

Do you know the name of this one? This one is called a sphere.

Lucas says, I can see that this sphere has one curved surface.

Let's have a look at some other spheres.

A sphere always has one curved surface.

It has no faces, no edges, and no vertices.

It just has one curved surface that goes all the way round, so it's shaped like a ball.

Now let's have a look at another shape.

I wonder if you know the name of this one.

This is a cylinder.

Lucas says, I can see that this cylinder has two circular faces.

Let's have a look at some other cylinders.

Do you think that is always true? A cylinder always has one curved surface and two circular faces.

It has no edges and no vertices.

Let's check if you can recognise a cone, a cylinder, and a sphere.

Can you say, which set each of these shapes needs to be sorted into? Pause the video and have a go at that now.

The first one is a sphere.

This one is a cylinder.

This one is a cone.

Cylinder, sphere, cone.

Cone, cylinder, sphere, cylinder, cone.

Have a look.

Did you sort all of those shapes into the correct like this? Excellent job if you did, you are really showing that you know what a cone is, and what a cylinder is, and what a sphere is.

Excellent work.

Now it is time for you to go and practise naming these 3D shapes.

First, you are going to choose one of these 3D shapes.

You are going to describe its properties such as faces, edges, or vertices.

Your partner needs to guess the name of the shape.

Laura says, make sure that you remember to swap over, so that you both have a turn at guessing the shape.

Lucas has a tip for you.

He says that you can make this more challenging by not letting your partner see the shapes.

Can they visualise what your shape might look like by listening to your description? That means they would have to listen really carefully to how many faces, or how many vertices, or how many edges, and they have to try and make a picture in their mind of what that shape could look like to help them guess rather than looking at the pictures of the shapes that you have.

When you have done that, you are going to have a go at completing this table.

You need to show the names and the properties of each 3D shape.

Finally, you are going to have a go at this question.

Is this sentence always, sometimes or never true? A 3D shape has more edges than it has faces.

I would like you to use the box to either write, or draw something that explains your thinking to show how you know if this sentence is always true, sometimes true or never true.

Pause the video and have a go at those now.

Off you go.

Well done for thinking so carefully.

Let's have a look and see how you got on.

On the first question you could have played the game with your partner like this.

Lucas said, my shape has six identical square faces.

Laura needs to think carefully, which shape do I know that has six identical square faces? And Laura says, I think you chose the cube, and then Lucas could say, that is correct.

Well done.

You got it right.

Now you describe a shape for me to guess.

So they remembered to swap over, so they both had a turn.

I hope that you remember to do that too.

Now it's Laura's turn to describe a shape.

Laura says, my shape has exactly one face and one vertex.

Now Lucas needs to think carefully.

Can he visualise that shape? Can he see a picture of it in his mind, a shape with one face and one vertex? I think he can.

Lucas says, I think you chose the cone.

And then Laura says, you are correct.

Well done.

Laura and Lucas played that game really well, didn't they? I wonder if you played it like that too.

Well done if you remembered to describe the faces, the vertices and the edges of your shapes.

Great job.

Now let's have a look at the second question.

You needed to complete the table to show the names and the properties of each shape.

Let's start with the first shape.

This was a cone, we can see it has one face, it has one vertex and no edges.

The second shape is a cuboid.

It has six faces and eight vertices.

The 12 edges was already completed for you.

The third shape is called a sphere.

It has no faces, no vertices, and no edges.

The next shape is a cylinder.

A cylinder has two faces, no vertices, no edges.

And the last shape was a cube, which has six faces, eight vertices and 12 edges.

Well done if you filled in all the spaces in that table and thought really carefully about the names of the shapes and their properties.

Great job.

Finally, you had to think about this sentence.

A 3D shape has more edges than it has faces.

Let's have a look at how you could have thought about this sentence.

You might have pictured some cuboids or some cubes.

These shapes have 12 edges and six faces.

So the sentence is true for these shapes, isn't it? These shapes do have more edges than they have faces, so at the moment this sentence would be true.

If you look at some different shapes though, let's have a look at some cylinders and some cones.

These shapes have either one face or two faces.

Oh, but they have no edges, so the sentence is not true for these shapes.

That means that this sentence is sometimes true.

Well done for thinking so carefully about that.

Now that you are at the end of the lesson, you have learnt that you can count the faces, the vertices and the edges of different 3D shapes.

You know the names and the properties of these 3D shapes.

You have learned that a cuboid has six rectangular faces, eight vertices and 12 edges.

You have learned that a cube is a special type of cuboid, it has six identical square faces.

You know the a cone has one circular face and one vertex.

You have learn that a cylinder has two circular faces, no vertices and no edges, and you have learned that a sphere has no faces, no vertices and no edges.

You have done some excellent thinking about 3D shapes in this lesson today.

Well done.

Hope you feel proud for yourself for your work today.

I hope that I will see you again soon for some more maths learning.

Bye.