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 that you are ready to work really hard and have lots of fun.

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

Today's lesson is called recognise, describe, and sort 3D Shapes, and it comes from the unit, recognise, compose, decompose, and manipulate 2D and 3D shapes.

I wonder which 3D shapes you can remember that you've learned about already.

Try and have a think about those because that's really going to help you with this work today.

By the end of this lesson, you are going to be able to recognise, describe, and sort different 3D shapes into sets.

Let's have a look at the key words that are going to help you with your learning today.

Let's practise saying them one at a time.

My turn.

Flat face.

Your turn.

My turn.

Circular face.

Your turn.

My turn.

Rectangular face.

Your turn.

My turn.

Square face.

Your turn.

My turn.

Triangular face.

Your turn.

Well done.

Listen out for all of those keywords today.

They are going to help you with your learning in this lesson.

There are going to be two parts to this lesson.

To begin with, you are going to look at how you can sort shapes into sets, and then in a little while, you are going to practise finding the sorting rule.

Let's start with the first part, sort shapes into sets.

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

Their names are Alex and Jacob.

Watch them carefully and listen to the things they have to say because they are very helpful.

Okay, are you ready to start your learning? Good.

Let's have a look.

You can sort things into sets by making a rule.

Let's have a look at one.

Has wheels.

Has no wheels.

That is our rule for sorting.

Where would the chicken go? (chuckles) You're right.

The chicken has no wheels.

The bus has wheels.

The car has wheels.

The house has no wheels.

A bike has wheels.

A sandwich has no wheels, and a car has wheels.

You can sort things into sets by looking carefully at the rule.

So, all the things in the first set have wheels, and all the things in the other set have no wheels.

Let's see if you can do that.

Look carefully at the rules this time because it's different.

Has no eyes.

Has eyes.

Do you think you can sort all of those objects into those two sets? Pause the video and have a go at sorting them into sets.

Off you go.

Okay, let's have a look at how you could have sorted these into the two sets, has no eyes and has eyes.

Let's start with the penguin.

The penguin has eyes.

The lollipop has no eyes.

The conquer has no eyes, and the cheese has no eyes.

The rabbit has eyes.

The panda has eyes.

The leaf has no eyes, and the bird has eyes.

Well done if you sorted those into the correct sets.

Alex thinks that he could sort these 3D shapes into sets by following a sorting rule.

Look at his rules.

Has a curved surface.

Has no curved surface.

What do you think is going to happen? Let's have a look.

The sphere has a curved surface.

The cuboid has no curved surface.

The cube has no curved surface.

The cylinder has a curved surface.

The pyramid has no curved surface, and the cone has a curved surface.

Alex was right, he can sort 3D shapes into sets.

Now he's thinking, "I wonder if there's any other ways that I could sort these shapes." You have just seen that 3D shapes can have curved surfaces, but they can also have flat faces and when you look carefully at the flat faces, they can be different shapes.

So, maybe, you could sort 3D shapes by looking at the shape of the flat faces.

Let's have a look at that a little bit more.

Cuboids have rectangular faces.

So, look at the shape of each face on the cuboid.

They are rectangles, so those are called rectangular faces.

Cubes have square faces, and some pyramids can have one square face too.

Can you see the square faces on the cube and on the pyramid? Pyramids have another shape face too.

Pyramids always have some triangular faces.

There they are.

And there's another shape we haven't talked about.

I wonder if you know what it is.

Cylinders have two circular faces, and cones have one circular face.

When the face is a circle, you call it a circular face.

So, you can see 3D shapes could have rectangular faces, square faces, triangular faces, or circular faces.

Let's see if you can spot those faces on some 3D shapes.

Which 3D shape has a triangular face? Do you think it's A, B, or C? The 3D shape with a triangular face is B, the pyramid.

Well done if you spotted that.

Let's have a look at another one.

Which 3D shape has a rectangular face, A, B, or C? The 3D shape with a rectangular face is C.

Good job if you spotted that one.

One more.

Which 3D shape has a circular face, A, B, or C? That one was a little bit trickier, wasn't it? Because you can't see any circular faces.

The shape with a circular face is A, the cone.

You have to imagine picking up that cone and looking underneath.

That would have a circular face on the bottom.

Well done if you spotted that one.

Good job.

You can use your knowledge of the shapes of faces on 3D shapes to make up a rule for sorting 3D shapes.

When you choose your rule, you make two sets.

One set will be called has mm, and the other set will be called has no mm.

For example, one set could be called has a square face, the other set would need to be called has no square face.

Let's see if you are good at thinking of rules for sets.

Who do you think has chosen the best set of rules here? Jacob has chosen has a circular face and can slide on a ramp.

Alex has chosen has a circular face and has no circular face.

Who has chosen the best set of rules for sorting, Jacob or Alex? Well done if you said Alex.

Alex has chosen the best set of rules because he remembered to only choose one thing.

His rules start with has and has no.

Jacob chose two different rules.

If he tried to sort shapes into these sets, some shapes would need to belong in both sets.

Alex chose the best set of rules for sorting shapes.

Alex is going to sort these 3D shapes into sets.

Let's watch what he's going to do.

Alex says, "First I need to read the rule for each set." Let's read the rule with Alex.

Has a circular face.

Has no circular face.

Okay, Alex has read the rule carefully.

He says, "I know that a circular face is a flat circle shape within a 3D shape." So, he's thinking about what circular face means and he knows it's a flat circle shape.

He's going to start with the first shape.

He says, "I need to look carefully at the first shape to see if it has a circular face." So, he's going to look at that cuboid, and he's thinking, "Does this cuboid have a circular face, a flat circle shape on it?" No, it doesn't, so he puts it in the has no circular face set.

Now he says, "I will look at the other shapes one at a time and sort them into sets." So, let's watch what he does.

He's going to start with the cube.

That has no circular face.

Then the cylinder has a circular face.

The pyramid has no circular face.

The cone has a circular face, and the sphere has no circular face.

Alex says, "The sphere has a curved surface, not a circular face." That's a very helpful thing that Alex has just told us there.

Even though a sphere looks like a circle, it is not a flat face, it's a curved surface.

So, a sphere has no circular face.

Let's see if you can help Alex now to sort some more shapes into sets.

Alex has been sorting, but he has one shape left to sort.

Could you help him to put the cone into the right set? Look carefully at the rules.

One rule is has a triangular face and the other rule is has no triangular face.

Where do you think that cone would go? Well done if you put the cone in the has no triangular face set.

Good job.

A cone has a circular face and one curved surface.

It doesn't have any triangular faces.

Oh, now let's see if you can help Jacob.

Jacob has tried to sort all of his shapes into sets, but he has made a mistake.

Do you think you could help him to correct it? Look carefully at the rules again.

Has a square face.

Has no square face.

Can you see one shape that Jacob has put into the wrong set? Have a look and see if you can help him correct his mistake.

Did you notice which one was in the wrong place? It's this pyramid, isn't it? The pyramid has a square face, so it should be with the cube in the has a square face set.

Well done if you notice that one.

Now you are going to go and do some practise of sorting things into sets.

I would like you to use some shapes printed on cards or to use some 3D shapes that you might have around you to practise sorting 3D shapes into sets.

You're going to choose a rule for your sets and you must remember to follow the has a mm and has no mm as a pattern.

Once you've chosen your rule, sort the shapes into the sets.

Alex wants to see how many different ways can you sort the shapes? How many different rules can you try? Are you ready to go and have a go at sorting? Excellent.

Off you go everybody.

Well done, everyone.

Let's have a look at how Jacob sorted his shapes into sets.

Maybe you did something similar to Jacob.

He chose the rule, has a square face and has no square face, and he remembered this time that a pyramid and a cube both have a square face, the sphere, the cuboid, the cylinder, and the cone has no square face.

Did you remember to only choose one sorting rule like Jacob did? Very well done if you did.

You've done some excellent sorting.

Now that you've learned about sorting shapes, you are going to move on and start thinking about finding the sorting rule.

Let's have a look at that.

Alex is going to sort these 3D shapes into sets, but this time, Alex isn't going to tell you his rule.

Watch how Alex sorts the shapes and have a think, what could his rule be? So, he's putting the cuboid in the second set, and the cube, and the cylinder.

Oh, the pyramid's gone into the first set.

The cone goes with the second set, and the sphere goes with the second set.

If you look really carefully at the shapes that are in each set, you can work out the rule.

What is different about the pyramid in the first set to all of the other shapes that Alex has put into the second set? Think carefully about the shape of the faces.

Let's have a look.

Alex's rule was has a triangular face, has no triangular face.

You can see, can't you, that the only shape that has a triangular face is the pyramid.

That is how we could work out Alex's rule.

Look carefully at that pyramid and remember that none of the other shapes have triangular faces.

Let's have a look at another example.

Jacob is going to sort his 3D shapes into sets and he's not going to tell you his rule either.

Let's watch what Jacob does.

Hmm, cuboid in the second set.

Cube in the second set Oh, the cylinder's in a different place this time.

The cylinder goes in the first set.

The pyramid's gone to a different place.

The pyramid is in the second set.

The cone goes with the cylinder, and the sphere has joined the second set.

Remember, if you look carefully at the shapes in each set, you can work out the rule.

Let's have a think together.

What can you see that's the same about all the shapes in the first set? Do you think they might have the same shape face? Let's have a look.

The shapes in the first set, we could say, has a circular face.

The second set has no circular face.

That was Jacob's rule.

Let's see if you can work out what the rule could be.

Look at how these shapes have been sorted.

Jacob thinks the rule might be has a curved surface and has no curved surface.

Alex thinks the rule might be has a square face and has no square face.

Whose rules do you think are correct? Pause the video and have a little think about that.

Okay, let's have a look.

This time it was Jacob who thought of the right rules.

Has a curved surface is the correct rule for the first set because cylinders, spheres, and cones all have a curved surface, and the second set has no curved surface.

A cuboid, a cube, and a pyramid only have flat faces.

Well done if you knew that Jacob was correct.

Now Alex and Jacob have found some objects to sort.

They're going to sort them into sets by looking at the shape of the faces.

I wonder if you can think about what the sorting rule might be this time.

These are the objects that Alex has put in the first set, and these are the objects that Alex has put in the second set.

Do you notice anything about the shape of the faces? Let's have a look.

The first set has a rectangular face and the second set has no rectangular face.

Alex has looked really carefully at the shape of the faces, hasn't he, to sort his objects into sets? Let's have a look how Jacob sorted his objects.

Look carefully at the objects he's put in his first set and his second set.

I wonder what his rule could have been.

Let's have a look at it.

The first set has a circular face.

The second set has no circular face, so the same as Alex.

Jacob has looked really carefully at the shape of the faces on these objects and been able to sort them into sets.

Let's see if you can choose the best rule for these sets.

Jacob thinks that the rule might be has a triangular face and has no triangular face.

Alex thinks the rule might be has a square face and has no square face.

Whose rule do you think is correct? Have a careful look and see if you can decide whose rule is correct for these sets.

This time, the person who's chosen the correct rule is Alex.

The first set all has a square face and the second set has no square face.

Well done if you knew that Alex had chosen the correct rule.

Now you're going to go and practise finding the rule when you are sorting shapes.

To begin with, I would like you to look carefully at these sets of shapes that have been sorted and see if you can match up the rule to the set by drawing a line to connect the rule and the set together.

Once you've done that, I would like you to try and think of some rules that could describe these sets.

Now, you might notice that there's only one shape in each set.

What I would like you to do, once you've chosen your rule, I want you to do some drawing and draw some more shapes that could belong in each set.

Make sure that the shapes you draw follow the rule that you have chosen.

Are you ready to go and think about sorting rules? Excellent.

Off you go.

Okay, let's have a look first of all at how you could have matched the rules to the sets.

The first two sets follow the rules has no square face and has a square face, and the second two sets follow the rules has no circular face, has a circular face.

Well done if you have matched those up correctly.

Now let's have a look at the second piece of work.

Wonder what kind of rules you made up for these two sets.

There are lots of different rules you could have had.

Maybe you did this one, has a flat face.

If you chose this rule, you might have drawn a cuboid, or something like a box.

You might have drawn a pyramid.

You might have drawn a cylinder.

If you did choose the rule has a flat face, your second set had to have the rule has no flat face.

Maybe, if you chose this rule, you might have drawn a tennis ball, a bowling ball, lots of different types of spheres.

Maybe you didn't choose this rule.

Let's have a look at a different rule you might have chosen.

Maybe you chose has a square face.

You could have drawn a pyramid.

That has a square face on the base.

You could have drawn a dice.

If you chose the rule has a square face, your second set must be has no square face.

So, perhaps, for this one, you drew a cylinder.

You might have drawn a sphere, like a tennis ball.

You might have drawn a cuboid, something like a box.

You might have drawn a cone, maybe an ice cream cone.

Well done if you thought really carefully about what the different sorting rules could be for those shapes.

Now that you're at the end of the lesson, you have learned that some 3D shapes have flat faces that can be different shapes.

You know that you can look carefully at the shape of those faces to be able to sort 3D shapes in different ways.

For example, you could sort 3D shapes into shapes that have a circular face and shapes that have no circular face.

You also know that you could sort 3D shapes by checking if they have a curved surface or no curved surface.

You have thought really carefully about 3D shapes today.

Well done, everybody, for working so hard.

Hopefully I will see you again soon for some more maths.

Bye, everybody.