# Lesson video

In progress...

Hi, everybody.

Welcome back to your unit on length and perimeter.

Today, we are going to be measuring and comparing lengths in mixed units.

So, let's put our hats on.

Tighten those ties and tell the computer now I'm a mathematician.

Super, let's get started.

So here is our lesson agenda for today.

Then look at our star words before comparing lengths using our crocodile jaws.

Then we'll do some measuring and comparing.

And then there'll be a quiz.

Before we begin, please make sure that you have the following resources.

You'll need a pencil, a piece of paper, and a ruler.

So if you need to grab anything, please do now and pause the video.

Brilliant.

Let's get started.

Look which units.

Look at the pictures and imagine the size of each object in real life.

If you were to imagine the real object, which unit of length would be most appropriate for each one? So you have the height of a front door, the width of the computer keyboard, the width of an earthworm, and the height of Big Ben's Tower.

Pause the video and have a think.

Well done.

Let's have a look.

So the height of the front door we had measured in metres, the width of the computer keyboard be in centimetres, the width of the earthworm, yuck, would be in millimetres, and the height of Big Ben would be in metres.

Let's look at our star words.

See that.

We have estimate.

We have accurate.

We have measure.

We have centimetres.

We have metres.

We have compare.

We have order.

We have longer, and we have shorter.

So we have estimate.

We have accurate.

You have measure, centimetres, metres, compare, order, longer, shorter.

Now these will help us remember our important vocabulary for this lesson.

But also, it's really fun.

And it makes the learning more fun.

So, if you see that I'm not using my star words, remember to remind me.

Which is the longest measurement? How do you know? Each of these three measurements start, begin with two centimetres.

So we know that all equal to two centimetres and something.

So let's have a look at the millimetres.

We have two centimetres and nine millimetres, two centimetres and eight millimetres, and two centimetres and seven millimetres.

So I know that two centimetres and nine millimetres would be the longest measurement because nine millimetres is greater than eight millimetres or seven millimetres.

And if he wants to put it a number sentence, we have our crocodiles facing the greater amount.

Great job.

So for this one, it's 10 centimetres and nine millimetres, which is the longest measurement because nine millimetres is greater than eight millimetres or five millimetres.

And here's our number sentence again.

Which is the longest measurement? How do you know? One metre and 50 centimetres, one metre and zero centimetres and one metre and 90 centimetres.

Well, they're all one metres, and I know that 90 centimetres is greater than 50 centimetres, and it's greater than no centimetres.

So the answer is one metre and 90 centimetres.

Here you have four sets of measurements, and you are going to compare the different lengths.

You need to put them in order.

Remember, to use your alligator jaws.

Pause video.

Well done, everybody.

Let's look at the answers together.

So the first one is five metres and 20 centimetres is greater than five metres and two centimetres, which is greater than five metres and zero centimetres.

The second one.

Five metres and 20 centimetres is greater than nine centimetres and three millimetres, which is greater than eight centimetres and two millimetres.

The third one.

21 centimetres and nine millimetres is greater than 14 centimetres and two millimetres, which is greater than 10 centimetres and one millimetre.

And finally, 10 metres and 30 centimetres is greater than 10 metres and 20 centimetres, which is greater than 10 metres and two millimetres.

Give yourselves a big pat on the back.

Remember to do some ticking and fixing.

So, you are going to measure two different items. I've already done this at my house.

So I've measured a magazine, which is 30 centimetres and five millimetres.

And I measured a book, which was 15 centimetres and nine millimetres.

And now I need to fill in the gaps.

So the length of the magazine is greater than the length of the book.

So that is what you're going to be doing today.

So you need to search around the house and find many things that you can measure with your ruler.

And then you need to write a sentence that tells me which object is greater than the other.

Remember to pause this video.

Great job, everybody.

I hope you had fun measuring today.