Lesson video

Hi, everyone, how are you? I am Ms. Mitchell.

Today in maths we're going to be making predictions about rotations.

In today's lesson, we'll be looking at clockwise and anti-clockwise.

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

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

Pause the video now to get this if you have not got it already.

Can you tell me which direction is clockwise and which direction is anti-clockwise? So could you please label these two arrows up here, one saying clockwise, one saying anti-clockwise? Did you manage to get it right? So clockwise is the normal way that we go around a clock, so from 12 to 1, 1 to 2, 2 to 3, and so on.

Anti-clockwise, anti means opposed or opposite, so it's the opposite way to clockwise, so the opposite way to clockwise this way would be, this way.

So this way is anti-clockwise.

What I would like you to do, I would like you to match the pictures to the correct turn.

So which of these pictures shows a quarter turn? Which picture shows a half-turn? And which picture shows a three-quarter turn? Pause the video now to do this.

And here are the answers.

So, as you can see on this picture, half of the circle is shaded in blue, and half of the circle is shaded white.

So this blue part here shows they've done a half-turn.

This picture shows an anti-clockwise direction because the arrow is going anti-clockwise, but we know that a half-turn anti-clockwise and a half-turn clockwise, you end up in the same direction, the same place.

Here shows a quarter-turn, and this arrow shows it's a quarter-turn clockwise, and, if you can see in a quarter-turn, in this corner here, this would be 90 degrees, which shows it is a right angle.

And then this blue shaded part here shows it is a three-quarter-turn, so three-quarters.

This is a quarter, this is a a quarter, and this is a quarter.

That is three-quarters, and the arrow is showing anti-clockwise because it's going the opposed way, the opposite way than a clock normally would.

Did you manage to get those answers correct? Well done if you did.

So now we're going to make some predictions.

Can you tell me what is a prediction? Can you give me the definition of prediction? A prediction is a sensible guess.

It's an educated guess.

Now, let's say I'm on the blue rectangle.

How could I get to the green rectangle? So if I'm started on the blue rectangle, and I want to get to the green rectangle, how could I get there? Did you predict how I would get there? That's right.

To get from the blue to the green, I could do a quarter-turn clockwise, or I could do a three-quarter turn anti-clockwise.

So I would say, if I started on the blue rectangle to get to the green rectangle, I could do a one quarter clockwise turn or a three-quarter anti-clockwise turn.

Let's do another one.

If I started on the yellow rectangle, and I wanted to get to the blue rectangle, how could I get there? If I started on the yellow, and I wanted to go to the blue, how could I get there? That's right.

You would make a half-turn.

Now does it matter if I say a half-turn clockwise or a half-turn anti-clockwise? That's right, they meet, and you would be facing the same way, so the half-turn clockwise, I'd get to the blue, and, if I did a half-turn anti-clockwise, I would get to the blue.

I'm getting to the same place.

I would now like you to have a go at the talk task.

Can you make a prediction about what turns you might have made.

There are three questions here.

Pause the video to complete the talk task.

Okay, we have a star word, and the star word is rotate.

Can you say the word rotate? Rotate.

Whisper the word, rotate.

Well done.

So rotation is when something turns or spins around a point located at its centre.

So let me just say that one more time.

Rotation is when something turns or spins around a point located at its centre.

I'd like you to rotate the arrow a quarter-turn clockwise.

Where could the arrow be facing if it was a quarter-turn clockwise? Think of a clock.

What number would it be facing? That's right, it'd be facing three o'clock.

so three o'clock would be here on a clock.

And this is a quarter-turn clockwise.

Okay, this is my starting point.

Could you please rotate the arrow a three-quarter turn anti-clockwise, anti-clockwise, the opposite of clockwise.

So rotate the arrow a three-quarter turn anti-clockwise.

There you go, there's the answer.

Did you manage to get that? One quarter, two quarters, two quarters is the same as a half, three-quarters.

Could you please describe this rotation? If you started on the green, and you ended up by the purple line.

So you start by the green line, and you end at the purple line.

What is the rotation? That's right, three-quarter turn clockwise.

Here's another one.

If I start at the green, and I end at the purple line, could you describe the rotation? That's right, it's a half-turn anti-clockwise because, if it was clockwise, it'd be on this side of the clock or the circle, but it's going this way, which is the opposite way that a clock would go, so it's a half-turn anti-clockwise.

Okay, for your independent task, I would like you to complete the worksheets and answer the questions.

Make sure you look at where the arrow is going, as that will help you.

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

And here are the answers.

Pause the video now to check your answers are the same as mine.

You've worked really hard today.

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

You've worked really hard, and well done, but let's see what you can remember by completing the quiz.

Hope to see you soon, bye!.