Lesson video

Hello everybody.

My name is Mrs. Johnson.

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

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

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

Today's lesson is called, Identify 2D shapes within 3D shapes," and it comes from the unit: Recognise, compose, decompose and manipulate 2D and 3D shapes.

You are going to be thinking really carefully about what 3D shapes look like.

Don't worry if you haven't really thought about this before because I'm going to help you and we will learn it together.

By the end of this lesson, you are going to be able to describe the individual faces on a 3D shape.

We have five key words that are going to help us in this lesson today.

I would like you to practise saying each one.

I'll say it first and then it will be your turn.

Ready? My turn.

Flat face.

Your turn.

My turn.

Curved surface.

Your turn.

My turn.

Circular face.

Your turn.

My turn.

Square face.

Your turn.

My turn.

Rectangular face.

Your turn.

Well done.

Some of those words are quite tricky today.

Listen out for them throughout this lesson, they are really going to help you with your learning that we're going to do today.

There are going to be two parts to this lesson.

To begin with, you are going to learn about rolling and sliding and then in a little while you are going to learn more about describing the faces of 3D shapes.

Let's start with rolling and sliding.

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

Their names are Izzy and Alex.

Listen carefully to the things that Izzy and Alex tell you because they have lots of helpful hints that can really help you with your learning today too.

Izzy has some 3D shapes.

She's going to put them at the top of the ramp.

Izzy says, "I wonder what will happen with each shape?" What do you think will happen? Shall we watch? I think we should, have a look at this.

Wow.

Did you notice that some shapes slid down the ramp and some shapes rolled down the ramp? I wonder why all the shapes didn't roll.

What do you think? Let's watch it again, this time, before each shape comes down the ramp, can you say if you think it's going to slide or it's going to roll, watch carefully and be ready to say what you think.

Let's have a look.

Well done.

You watched that really carefully.

What happened with these shapes? That's right.

All of these shapes slid down the ramp.

These shapes slid because they have a flat face.

Flat face means that if you move your hand across the surface, your hand will move in a straight line.

Watch this video so you can see what I mean.

Can you remember what happened with this shape on the ramp? That's right.

This sphere, this shape, rolled down the ramp.

That's because a sphere has a curved surface and shapes with a curved surface can roll.

A sphere doesn't have any flat faces.

It only has a curved surface.

That means if you move your hand across the surface, your hand will move in a curve.

Watch this video so you can see what I mean.

Now let's check that you know which shapes would slide and which shapes would roll.

The first question is, which 3D shapes can slide? Do you think it's A or B or C? The 3D shapes that can slide are A and C.

Well done.

If you said that.

The pyramid can slide because it has mm faces.

The cube can slide because it has mm faces.

What do you think that word could be? The pyramid can slide because it has flat faces.

The cube can slide because it has flat faces.

Well done If you said flat.

Now for a different question.

Which 3D shape can roll? Do you think it's A or B or C? This time the 3D shape that can roll is C.

Well done if you said C.

Do you think you'll be able to work out the missing word in this sentence? The sphere can roll because it has a mm surface.

What do you think that word could be? The sphere can roll because it has a curved surface.

Well done if you said curved.

Now let's learn a little bit more about curved surfaces.

We've looked at a sphere so far.

There are other shapes that have a curved surface.

Look at this cylinder and this cone.

They have a curved surface too.

Is every surface curved? What do you think? Let's think about that a little bit more.

Cylinders and cones both have a curved surface.

I wonder what's going to happen when these shapes go down the ramp? Alex thinks that a cylinder and a cone can roll but they cannot slide.

Izzy thinks a cylinder and a cone could roll or slide depending on which face it is lying on.

Shall we watch these shapes go down the ramp and see who's right? Do you think it's going to be Alex or Izzy? Watch carefully and have a look.

Okay, now we've seen those shapes on the ramp, let's have a think about what happened.

Cones and cylinders have both curved surfaces and flat faces.

If the shapes are lying on their curved surface, they can roll, but if they are lying on their flat face they can slide.

Did you see that in the video? The cone and the cylinder can roll and slide, so Izzy was right.

Let's check that you understand flat faces and curved surfaces on these shapes.

Which cylinder is lying on its flat face? Is it A, B, or C? The cylinder lying on its flat face is B.

Good job if you said that.

Now I want you to think about which 3D shape do you think will slide? Is it A, is it B, or is it C? The shape that will slide is B.

Well done if you said B.

Now I want you to try and think which 3D shapes will roll.

Do you think it's A, B, or C? The 3D shapes that would roll are A and C.

Well done if you spotted both of those.

You are going to do a bit of practise now.

I would like you to ask an adult to help you set up a ramp or a slide and then go and choose some 3D shapes or some objects.

Don't put them on the ramp straightaway though.

Before you put them on the ramp, I want you to look carefully at them.

Can you see any flat faces or any curved surfaces? Can you predict, can you say if each one is going to roll or slide or maybe it might be able to do both? Then once you've said what you think is going to happen, put them on the ramp and test out your ideas.

Are you ready to go and have a go at that? Off you go.

Well done, everybody.

There was lots of rolling and sliding in that work wasn't there? Good job.

Let's have a look at what happened when Izzy tested out some more objects that she found.

She put each one on the ramp and then she sorted them into these three groups.

First she made a group of all the objects that could slide.

Then she made a group of all the objects that could roll and finally, she made a group of the objects that could slide and roll.

If we look carefully at the objects that could slide, we can see that they only have flat faces.

The objects that can roll only have a curved surface and the objects that can slide and roll have both flat faces and a curved surface.

Well done if you were able to sort your items into groups a bit like this, it's good to see that you were thinking really carefully about whether something would roll or slide or both.

Now we're going to move on to the second part of the lesson and you are going to be thinking about how you can describe the faces of a 3D shape.

Izzy has been doing something really fun.

She's been playing with some playdough and she's used one of her 3D shapes to make some stamps in the playdough.

I wonder which 3D shape she might have used? Have a look carefully at all of her shapes.

Which one could have made the stamps in the playdough? Let's have a look.

Izzy used the cuboid.

Cuboids have rectangular faces, so they make a rectangle-shaped stamp in the playdough.

If you use different 3D shapes, you could make different stamps in the playdough.

So I can see here there is a square stamp, some triangle stamps and some circle stamps.

The square stamp could have been made by a cube because a cube has square faces.

The triangle stamp could have been made by a pyramid because a pyramid has triangular faces and the circle stamp could have been made by a cylinder because cylinders have circular faces.

Maybe if you have some playdough near you, you'd be able to go and get some 3D shapes and some playdough and see if you could make some stamps as well.

Let's see if you can work out now, which shape might have made this stamp in the playdough.

Look carefully at the shape of the stamp.

Which 3D shape could have made that stamp? Do you think it was A, or B, or C? The 3D shape that made this stamp is C.

Well done if you said that.

I wonder if you know the missing word in this sentence.

A cube has mm faces.

I think it might be telling us the shape of the face.

What do you think it could be? A cube has square faces.

Well done if you said that.

Now let's have a look at another stamp.

Ooh, look carefully at the shape of the stamp this time.

Which 3D shape made this stamp? Do you think it was a cube, a pyramid or a cylinder? 3D shape that made this stamp is the pyramid.

Wonder how we know? Look at this sentence.

What word do you think is missing? A pyramid has mm faces? Again, it's about the shape of the face.

What do you think the word could be? A pyramid has triangular faces.

Well done if you said triangular or you might have said triangle.

Good job.

Now, Izzy and Alex have started doing something else.

They have started playing a game.

It's a really fun game that you are going to try in a few minutes, so let's watch carefully to see how they play.

Alex has chosen a shape, but he hasn't told Izzy what it is.

He's going to give her some clues.

He says, "My shape has one flat circular surface.

It has one curved surface." Hmm.

Now Izzy has to think about what that shape could be.

She's looking carefully at all of the different shapes and she's thinking about which shape has one flat circular face.

And this is the shape that she's thinking of.

So Izzy is going to say, "I think your shape is a cone," and she got it right.

Well done to Izzy.

Then they swap over.

So this time Izzy has chosen a shape and Alex has to try and guess what it is.

Izzy says, "My shape only has square faces.

All the faces are flat." Alex has to think carefully.

Look at all of those shapes.

He's thinking, which shape only has square faces? They are all flat.

Oh, he thinks he can see it.

This is the shape he's picturing.

So Alex says, "I think your shape is a cube," and he got it right too.

Well done to Alex.

I wonder if you can guess Izzy's shape this time.

This time Izzy's clues say, "My shape has two flat circular faces.

It has one curved surface." Look carefully at those shapes.

Which one do you think Izzy has chosen this time? Let's see if you've got it right.

I think your shape is a cylinder.

Well done if you said that.

Can you see the picture of the cylinder? It matches Izzy's clues.

It has two flat circular faces and one curved surface.

Now let's see if you can guess Alex's shape.

Think carefully and look at the shapes.

Alex says, "My shape has rectangular faces.

All the faces are flat." Which shape could Alex be describing? Have a think.

Let's find out if you've got it right.

I think your shape is a cuboid.

Well done if you said cuboid.

Look at the picture.

We can see that the picture matches Alex's clues.

Now that you've watched Izzy and Alex play the game, I think that you're ready to go and have a go.

Maybe you can find a partner to play with or you can find a grownup who will play this game with you.

First, you need to choose a shape.

You could use some cards to help you choose a shape or you could use your own shapes that you have.

Don't tell your partner which one you've chosen though.

You are going to give them some clues.

You need to describe your shape and see if your partner can guess what it is.

Once you've done it, make sure that you swap over so that you get a turn to guess as well.

While you're playing, don't forget to use these really important words that you can see.

These are our keywords from the lesson today, so make sure that you use flat face, curved surface, circular face, rectangular face, and square face in your game.

Are you ready to go and play? Off you go.

Well done, everybody.

That game was so much fun.

Let's see how Alex and Izzy managed to play.

Izzy chose first and these were her clues.

"My shape only has one curved surface.

It has no flat faces." Hmm.

Alex had to think carefully, which shape has no flat faces and it only has one curved surface? Aha.

This is the shape that he pictured.

And then Alex said, "I think your shape is a sphere." Did you notice that Alex and Izzy remembered to use some of these keywords? I wonder if you remembered to use them too.

Well done if you did.

Now that we're at the end of the lesson, you have learnt that some 3D shapes have curved surfaces and some have flat faces.

Some 3D shapes can even have both.

You have learnt that shapes with curved surfaces can roll shapes with flat faces can slide.

You've learnt to describe the shape of the faces.

You can say that a cone has a circular face, a cuboid has a rectangular face, or it might have a square face.

You have worked really hard today to describe 3D shapes and think really carefully about whether they would roll or slide.

You've all done a really good job.

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

Bye, everybody.