# Lesson video

In progress...

Hello mathematicians.

It's Miss Charlton and Hedwig here back with some more exciting learning.

Now I'm actually really excited about today's lesson.

I think you're going to really enjoy it.

Well, I hope so anyway.

So let's find out what we're going to be doing.

Today is part one through lesson one in the use of language.

The language of position, direction, and movement.

So the next lesson, you'll continue with this as well.

First of all you're going to practise giving and following directions.

And use the language of direction in a game later.

Then you'll do your independent task, and an end of lesson quiz.

Today you'll need a pencil and some paper.

Now let's start off with a brain teaser.

I wonder if anybody knows their left from their right.

Can everyone put their hands up in front of them, and I want you to have a look.

And now you know the letter L, don't you? So put your hands in front of you, your palms facing away, the back of your hands facing you.

Which one of those looks like an L? I know this one looks like an L to me.

So that is my left hand, and the other one must be my right hand.

Like the picture on the screen.

Those are my hands.

That one looks like an L, so that's my left hand.

And the other is my right.

And you're going to need to know that in today's lesson, so that you can follow directions clearly.

Let's go through our star words.

Left! Right! Algorithm! Algorithm? That's a complicated word, but don't worry we'll find out about it later.

Now this here is a very special person.

It's an alien and he has come to earth and he only speaks in algorithms. Hmm.

And this is his algorithm song.

Are you ready to sing it with me? It goes like this.

♪ Alien algorithm one, two, three ♪ ♪ Tell me how to do it be bossy ♪ ♪ Alien algorithm one two three ♪ ♪ What are the steps ♪ ♪ Please tell me ♪ Can you sing that with me? Let's do that again.

Let's get talk partners involved.

Come on Hedwig.

Wakey wakey you can sing.

♪ Alien algorithm one two three ♪ ♪ Tell me how to do it be bossy ♪ ♪ Alien algorithm one two three ♪ ♪ What are the steps ♪ ♪ Please tell me ♪ But what on earth is an algorithm? Because this alien only seems to speak in algorithms. An algorithm is a set of instructions.

Can you say that? An algorithm is a set of instructions.

Well done.

It's a very big word for a little thing isn't it? An algorithm is just a set of instructions.

For example if I were to follow these instructions in my house I would end up in my kitchen.

I need to go forwards four steps.

One, two, three, four.

And then I need to turn a quarter turn left.

So my body needs to turn a quarter left.

So if you're facing this way, a quarter would be that.

Or the other way a quarter would be that.

Can you all practise turning a quarter? So face the screen and turn sideways.

That's a quarter.

Now turn a quarter back to face me.

That's a quarter.

Now let's turn a quarter the other way.

Are you ready? Turn a quarter.

That's a quarter.

And then a quarter back to face me.

There you go.

Really well done everyone.

So if I walk forwards four steps.

One, two, three, four, just like the diagram turn a quarter left and then go forwards two steps.

One, two, I would end up in my kitchen.

So I have followed an algorithm, a set of instructions to get to a place.

Just like the diagram's showing you.

One, two, three, four steps forward, a quarter turn left and two steps forward.

Let's sing our algorithm song again to remind us of what an algorithm is.

♪ Alien algorithm one two three ♪ ♪ Tell me how to do it be bossy ♪ ♪ Alien algorithm one two three ♪ ♪ What are the steps ♪ ♪ Please tell me ♪ Now that you know what an algorithm is, that song probably makes more sense to you.

Now I want to give you a set of instructions.

A set of instructions or an algorithm.

Are you ready? I want you to listen carefully to my instructions and then you need to stand up and follow the instructions carefully.

Now just before I give you them I want you to be very careful.

Because I don't want you tripping over things in your house.

So you need to look carefully to see what's in front of you or what's next to you and see if you can follow the directions.

Now if I make you bump into a door or something I'm very sorry I hope it's not too hard.

So be careful.

Are you ready? Your instructions, I'll say them twice, Are to go forwards two steps, turn a quarter turn left, and go forwards four steps.

Just like the diagram.

Forwards two, turn left, forwards four.

Walk forwards two, turn left, and then walk forwards one, two, three, four, and then come back to the screen when you're ready.

Can you tell me where you ended up? Everyone tell me on the screen.

Everybody shout at me where did you end up.

Oh I bet some of you bump into a door.

I hope nobody tripped over anything.

Now your task is to do that by giving instructions to either somebody in your house or making them up yourself and creating your own algorithm to go around your house.

Or wherever you're doing this learning.

So you could go forwards, backwards, turn left or turn right.

And you get to decide how many steps forward, how many steps backwards and how many turns you do.

You might like to decide that you want to figure out an algorithm to get to a different room.

Or maybe you just want to count how many you're doing as you go along.

Pause the video now and have a go.

There won't be any answers to get because you'll all have different algorithms that you've created.

I can't wait for you to come back and we can talk about how you got on.

Did everybody enjoy that? Who ended up in their kitchen? Put your hand up here if you ended up in the kitchen.

Who ended up near the television? Who ended up near their bedroom? Who bumped into something on the way? Hopefully you had a great time with it.

Let's finish off by singing our algorithm song once more.

♪ Alien algorithm one two three ♪ ♪ Tell me how to do it be bossy ♪ ♪ Alien algorithm one two three ♪ ♪ What are the steps? ♪ ♪ Please tell me! ♪ Finally, just before you go let's wake up Hedwig.

I actually don't know if she got much sleep during that lesson because it was so exciting walking around the house and bumping into things.

So Hedwig sorry that you didn't get much sleep.

Maybe you caught some of that lesson.

What we did was we met a special visitor.

He was an alien and he only communicated using algorithms. And we learned that the word algorithm means a set of instructions.

And then we used algorithms to navigate, to plan a different route around wherever we were.

In our houses or in our classrooms. Wherever we were we used an algorithm.

Do you understand that Hedwig? She does! I think she understood it really well today because I don't think she slept much in the lesson.

I hope you enjoyed today's lesson everybody.

See you again very soon.

Bye!.