Lesson video

Hello, my name's Miss Robson.

In this lesson, we are going to be exploring doubles using numbers up to five.

We will first start by looking at what a double is.

Then, we'll look at some different representations and try to decide if they are or aren't doubles.

Then, we'll look at doubles in the context of ladybirds.

Finally, it'll be your time to investigate some doubles for your task.

For this lesson, you will need at least 10 things that you can use when you're trying to work out your doubles.

These could be spots for your ladybug, or they could be cubes, Lego, or beads.

Pause the video now to collect the resources that you need.

When you're ready, press play.

A double number is when we have something and we add the same amount again.

On the screen, I can see a few different representations of doubles and I have a few different representations of doubles myself, too.

If I had three beads, just as we can see groups of three apples on the screen, and I wanted to double it, all I need to do is add the same amount again.

Three and three.

Three and three make six.

I can check to make sure that they are the same.

All the beads are a consistent size so I can see that they are the same size towers, too.

Three and three make six.

Double three is six.

I also have pens.

If I had three pens and I wanted to double those, all I would need to do is get three more.

Three and three make six.

Double three is six.

Every time that we work out one of our doubles, I'm going to say that sentence and I want you to try and copy it after me.

So, double three is six.

Excellent.

On the screen, I can see two lots of apples.

In each group, there are three apples.

This is them represented in a part-whole model where the whole is six and the parts are both three because they are double, they are the same number twice.

I can see two towers of blocks.

Both towers have three cubes, which means that the towers are the same size because the blocks are all the same size.

Three different ways to show the same double of three.

Double three, whether we're doing it with apples, in a part-whole model, using cubes, using pens, or even using beads, it is always going to be six.

Double three is six.

Excellent.

Now that we know that doubling is just adding the same amount again, making the same quantity twice, let's have a look at a few other examples.

Can you tell me, are these all doubles? Let's look at one at a time to try and decide.

Looking first at this ladybird, here.

Is she representing a double number? You can show me your thumbs up for yes, she is, or your thumbs down for no, she's not.

Yes, she is.

On both sides of her back, she has two spots.

Two and two, they're the same number twice so it's a double number.

Double two is four.

Excellent.

Then, we have some towers, over here.

Is this a double number or is this not a double number? This is a double number.

Three and three.

Three and three make six.

Three and three make six.

Oh, that's not the sentence I want us to repeat.

Double three is six.

Fantastic.

Then, I have this one, here.

Is this a double number? Yes, it's a double or no, that's not a double.

No, that's not a double.

If I use my beads to check the quantities, I have two as a part and I have six as a part.

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

I have two as a part and six as a part.

These aren't the same size, are they? One part is much bigger than the other and a double needs to have both parts be the same size.

We're adding the same part twice.

So, this is not a double number, What about then, this one, over here? The whole is still eight, like it was in this part-whole model, here, like it was in this part-whole model, here.

But over here, the parts are different.

Yes, this is a double number or no, it's not a double number.

Yes, it is a double number.

Same cubes, same beads, sorry.

I still have all eight but I'm going to put four at one side and four at the other.

I can fold them in half to check.

Four and four, they're the same size.

I also know they're the same size because they are the same number.

But sometimes it does help me to represent it using something and then I can check, like this.

Double four is eight.

It is a double number.

Fantastic full sentences.

My lucky last one is the eggs.

Now, there's a group of eggs here and a group of eggs here.

You might need to do a bit of counting to decide it is a double number or it's not a double number.

Can you show me your thumbs? Do you think it is or it isn't? It's not a double number.

We have four as a part, just like this one here, and the other one, the other circle, has five as a part.

Four and five are not the same number.

We're not adding the same number twice.

They're different.

This one has more.

One of the circles has more eggs.

If it was a double number, both parts would have to be the same.

Both parts would have to be the same.

So, this one is not a double number.

When we're looking at double numbers, we quite often use ladybirds to help us work it out.

In nature, if you ever find a ladybird, most of the time, they do have the same amount of spots on each wing.

Sometimes, they have a special odd spot that goes over both wings.

But, most of the time, both sides of their body will have the same amount of spots.

We do use them to help us with our doubles because if you put the spots on and you make sure you put the same spots on each side, then you will be able to calculate your double number.

Here, the ladybird is showing us a double number.

On one side of her back, she has two spots.

And on the other side of her back, she has two spots.

Double two is four.

We can even write this in a part-whole model.

Let me show you a few more doubles using the visualizer.

Here is the ladybird that we were just looking at.

I have two spots on one side of the wing and two spots on the other.

My parts are two and two.

And the whole is two, four.

The whole is four.

Let me try a different one.

I'm going to put just, let's do three and three.

Now, my parts are three and three.

And my whole is one, two, three, four, five, six.

The whole is six.

Double three is six.

Your turn.

Super.

Let's do one more.

I'd like your help with filling in the part-whole model.

This time, I'm going to put one, two, three, four, five and one, two, three, four, five.

The arrangements can be different because there's still five on each side of the wings.

Let me clear my part-whole model.

How many in each part? There is five in each part.

How many are there all together? Point to the screen when you're counting, if that helps you.

All together there are 10.

Double five is 10.

Double five is 10.

Can you repeat that sentence? Excellent.

Now that we've had a quick look at how to record a few different ladybird doubles and how to use the wings to help us, you can see at the bottom a few more ladybirds.

The first one has four and four.

Four and four would make eight.

Double four is eight.

The next one only has one wing filled in.

It has three on one side and nothing on the other side.

We would have to fill in the other three spots.

Three on one side, three on the other side, the whole is six.

Double three is six.

The last one's easy.

Have a go.

There's one spot on one side.

So, how many spots would you have to put on the other side of the ladybird? Just one spot.

So, one and one, what is double one? Double one is two.

Again, double one is two.

Excellent.

I can check that again by using my bead string.

But that one's super easy.

Look, double one is two.

For your task today, you're going to have some blank ladybirds, so some ladybirds with no spots on them, and it's your job to roll the dice or pick a number that is smaller than five and double that number.

So, you might have to draw four spots on one side and four spots on another side.

And then, just like we were doing earlier, fill in the part-whole model.

See if you can investigate double one, double two, double three, double four and double five.

It's time for you to pause the video, now, and complete your task.

Try to double one, two, three, four and five.

You could even go on to doubling six if you feel like a bit of a challenge.

Pause the video now to complete your task.

When you're ready, press play.

To recap and also to check your answers if you need to, we're going to go through the doubles really quickly.

Double one is two.

Double two is four.

Double three is six.

Double four is eight.

And double five is 10.

Our double fares are something that we try to learn quickly and to have quick recall of because they will help us later on when we come to do addition and subtraction or if we're looking at the inverse of half, which is what we'll be learning about in our next lesson.

To finish, I want you to have a look at this representation.

There's a number line on the screen and there's a bar model on top of the number line.

What do you think this representation is showing? This representation has a yellow bar across the top.

I don't have yellow, unfortunately.

So, I'm going to show you my orange cubes to show you that bar.

The yellow bar is the length of four.

Here, I have four cubes.

Underneath, it has two parts.

So, just here with my two parts, I have one that is white and one that is black.

They are both two.

This representation is showing me that double two is four.

I've made the same bar model using my cubes and double two is four.

I've got two and two and across the top, the four is the same size.

So, it's showing you the different parts of four if I am breaking it up in half.

Thank you for joining me today.

I hope you've enjoyed our lesson on doubling and getting to use the ladybirds to represent some different doubles.

If you'd like to, why not share your work with us? If you'd like, ask your parent or carer to share your work on Twitter by tagging @OakNational and using the #LearnwithOak.

We'd love to see what you've been getting up to.

Don't forget to go and complete the quiz.

Thanks again for joining me.

See ya next time.