Lesson video

Hi, everyone, I'm Miss Mitchell.

Today in maths, we're going to be naming and describing 3-D shapes.

In today's lesson, we'll be looking at 3-D shapes.

You will complete a talk task, an independent task, and then a quiz.

For today's lesson, you will need a pencil and some paper.

You will also need some items in your home to look at.

Please ask a parent or carer before touching any items. Here are some 3-D shapes.

A 3-D shape is when it has depth.

That means it has three dimensions.

It has a width, a length, but it also has depth, the three dimensions.

This here is a sphere.

Now can you think of any real life objects that look like a sphere? So I'm thinking something maybe like a football or a tennis ball or a globe.

They are all spheres.

Over here, I have a cone.

What is something in real life that looks like a cone? Well, straightaway, I think of an ice cream cone.

Over here I have a cuboid.

Now in a cuboid, opposite faces are equal.

Therefore, this face will be identical to this face over here that you can't see.

This face will be identical to this back face that you can't see.

And this top face will be identical to the bottom face that you can't see.

So a real life object that could be a cuboid shape is perhaps a box.

My coffee table is a cuboid.

Over here, we have a cylinder.

Can you say cylinder? Now a cylinder has two faces that are circles.

Now in real life objects, I'm thinking maybe a can, a Diet Coke can, or a tube.

Both are cylinders.

Over here, I have a cube.

Now it's quite similar to a cuboid, but it's different because in a cube, all the faces are square.

All the faces are the same.

So you might get in a cube, I mean, like a Rubik's cube, or you might get cube boxes.

And finally over here, we have a pyramid.

Now, straight away, when I see a pyramid, I think of the Egyptian pyramids.

What I would like you to do for your talk task is to find five or more 3-D objects in your home.

Can you look at the object and decide what a 3-D shape it is? So for example, the coffee table is an example of a cuboid.

Could you please pause the video now to find your five or more objects? So let's have a look at these 3-D shapes in a little bit more detail.

When I'm describing a 3-D shape, I'm going to be thinking about what properties I can see.

Can I see edges, vertices? How many faces does the shape have and what shape are they? Let's start with a cube.

I can see that a cube has square faces.

I could say it has six square faces.

Because the faces are square, all of my edges, which you can see here, are of equal length.

An edge is where two faces meet together.

We can also look at vertices.

A vertex is where two edges meet together, a little bit like the corner of a shape.

And I can count the vertices on each shape.

Let's move on to a sphere.

Now a sphere is quite difficult to see in a picture like mine, but a sphere is the same shape as a ball.

It has no vertices and no edges and just one curved surface.

We could say it has one face, which is curved.

Now the cuboid is very similar to the cube, but not all of its edges have to be equal.

But again, it has six faces.

The faces are a rectangle shape.

They could be a square shape as well, but they do not all have to be equal length edges compared to the cube.

Now you might notice that opposite faces are equal size.

We can also point out the vertices, one here, one here, and we can count them.

What sentences can you say about these shapes? We then have a square based pyramid.

So in a square based permit, the base, which means the bottom, is a square shape and then it meets up at the top to this, which is what we call an apex.

So apex is a point.

A square based pyramid, so here's the square, and then it comes up to meet at the apex.

And here we have a cone.

Now a cone has two faces.

It has a circle face, here, and then it has the face here as well.

Finally, we have a cylinder.

A cylinder has three faces, two circle faces, and then the face in the middle.

Here is your independent task.

I have written some descriptions for each shape.

What I would like you to do is to look at the picture and to match the description to the correct shape.

Pause the video now, and then press play when you are ready for the answers.

And here are the answers.

Pause the video now to check the answers are correct.

If you'd like to share your work with Oak National, then please ask your parents or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak.

You've done a fantastic job today.

Now let's see what you can remember by completing the quiz.

See you later.

Bye.