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

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

This lesson is called measure length using objects.

It comes from the unit numbers zero to 20 in different contexts.

By the end of this lesson, you will be able to measure length, including height by using different object and you will be able to explain how to do this accurately.

There are two important words that I would like you to practise for this lesson.

I'm going to say them first and then it will be your turn.

Ready? My turn, measure.

Your turn.

My turn, accurately.

Your turn.

Well done.

Listen out for those words today.

They are going to be really important for what you are learning about.

There are going to be two parts to this lesson.

To begin with, you are going to learn how to measure length using objects and then in a little while you are going to learn about how you can use objects to measure length accurately.

There's that important word we've just practised.

Let's start by learning how you can measure length using objects.

There are going to be two friends in this lesson today who are going to help.

Their names are Sophia and Lucas.

Listen out and watch them really carefully in this lesson because they will really help you with your learning.

Sophia and Lucas have been for a walk and they've collected lots of leaves.

Look at all those different leaves.

Can you see all the different colours and the different shapes? I wonder if you've ever been out for a walk and collected leaves like this.

Lucas has noticed that they are all different sizes.

Sophia thinks that maybe they could measure some of the leaves and find out how long they are.

Sophia's going to start by measuring this leaf and she says, "I have some dominoes that we could use to measure the leaf." Let's see how she can use dominoes to measure the length of this leaf.

Lucas says, "Let's rotate the leaf so it is laying in a straight line." That looks a bit easier to measure now.

He also says, "Make sure you place the first domino right at the end of the leaf." There it is, right at the end, it's even covered up the stalk.

Sophia says, "I can add more dominoes until I reach the other end of the leaf." Let's see what happens.

That's two dominoes.

That's three dominoes and now we've reached the end of the leaf.

1, 2, 3.

This leaf is three dominoes long.

Lucas and Sophia measured some more leaves.

Let's see how they did it this time.

The leaf has been rotated so that it's lying in a straight line to make it easier.

Now they're going to place the dominoes on.

1, 2, 3, 4.

This leaf is four dominoes long.

Now the other leaf is lying in a straight line.

1, 2.

This leaf is two dominoes long.

Lucas wants to find some more things to measure that might be longer than four dominoes.

Can you see anything around you that would be longer than four dominoes? Let's see what they choose to measure next.

Lucas and Sophia measured some different objects.

They found some sunglasses.

Let's see how they measure the sunglasses.

Now, they can't put the dominoes on top of the sunglasses this time like they did with the leaves because the dominoes would just slide off, wouldn't they? Sophia says, "When objects are not flat, you can place the dominoes in a line above or below the object." so they're not going to put the dominoes on top of the sunglasses.

They're going to make a line just above or just below.

Let's have a look at that.

1, 2, 3, 4, 5.

The sunglasses are five dominoes long.

Oh, now they found a carrot to measure.

Let's see how they can use the dominoes to measure the carrot.

1, 2, 3, 4, 5, 6, 7.

This carrot is seven dominoes long.

Let's check that you know how to use dominoes to see how long an object is.

Can you see how many dominoes long is the car and how many dominoes long is the phone? Pause the video and see if you can complete those sentences.

Well done everyone.

Let's count the dominoes all the way to the end of the toy car and that will tell us how long the toy car is.

Ready? 1, 2, 3, 4, 5, 6, 7.

I'm not going to count any more dominoes because I have reached the end of the toy car, so the toy car is seven dominoes long.

Now that I look at the phone, I don't need to count the dominoes again.

I just need to find where the end of the phone is and I can see it's here, so that means the phone is five dominoes long.

Well done if you found that the toy car was seven dominoes long and the phone was five dominoes long, good job.

Oh no, Lucas has got a problem.

He says, "My sister wants to play with the dominoes now.

We will have to stop measuring." Oh, dear.

They were really enjoying their measuring, weren't they? That's a shame.

Wait a minute.

Sophia says, "It's okay, we can use some different objects to measure length." We don't have to use dominoes.

Let's use something else.

I wonder what they're going to use this time.

Let's have a look.

"Shall we try using sharpeners this time?" Lucas says, "we could measure these pieces of ribbon that I found." Let's see how they're going to use sharpeners to measure the ribbon.

Going to make a line of sharpeners.

1, 2, 3, 4, 5, 6, 7, 8, 9.

The striped ribbon is nine sharpeners long.

Lucas has had an idea.

He says, "?et's leave the sharpeners in the line and move the ribbons this time." It takes a long time, doesn't it, to build a straight line of objects so if you keep your straight line and move your object that you want to measure, that might be easier.

So Lucas and Sophia are going to move the ribbon and leave the line of sharpeners.

Sophia has noticed that this spotted ribbon is longer.

She needs to add more sharpeners.

Let's see what she needs to add.

We are already on nine, so we will start our count from nine and we will say 10, 11, 12.

The spotted ribbon is 12 sharpeners long.

Now it's time to measure the final piece of ribbon.

You can see that the end of the plain ribbon lines up with seven sharpeners.

That means the plain ribbon is seven sharpeners long.

Check if you can use sharpeners to measure the length of some objects.

How long are these pieces of rope? Pause the video and have a go at measuring these pieces of rope in sharpeners.

Well done.

Let's have a look and see if you were thinking along the right lines.

You need to count the sharpeners until you reach the end of the first rope.

Let's do that together.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13.

The first rope is 13 sharpeners long.

Did you notice anything about the second rope? Sophia did.

Sophia noticed that the second rope is one sharpener longer so she says, "I didn't need to count again.

I know that one more than 13 is 14." So the second rope is 14 sharpeners long.

Lucas says that we have used objects to measure how long things are.

Is there any other length that we can measure? This astronaut might be giving you a clue.

What could you measure on that astronaut? I think you've spotted it.

You could try and measure the height of the astronaut.

How tall is this astronaut? Lucas says, could we use my building blocks to measure this time? Let's see how they could use building blocks to measure how tall this astronaut is.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11.

This astronaut is 11 blocks tall.

Lucas and Sophia built a tower of blocks to help them measure the height of some more toys.

Sophia says, "I think it'll be helpful to mark where 10 blocks are." Let's put that on.

Now know that is where 10 blocks are.

Let's measure the height of this robot.

We can start our count from 10 if we know that's where 10 blocks are, you don't need to count the first 10 blocks again.

You can start your count from 10 and you can say 11, 12 and then you can stop counting because we've reached the top of the robot.

The robot is 12 blocks tall.

Let's see if we can do that to measure the height of the teddy.

You can start your count from 10 and you will say 11, 12, 13, 14, 15, 16, 17 and then you can stop because you've reached the top of the teddy.

The teddy is 17 blocks tall.

Let's check if you can do that.

See if you can find out how tall these toys are.

Try to use the 10 blocks to help you so that you don't have to count every single block.

Can you start your count from 10? Pause the video and have a go at finding out how tall these toys are.

Well done everyone.

Let's start with the panda.

Here is the top of the panda.

I can start my count from 10 and I could say 11, 12, 13, 14.

The panda is 14 blocks tall.

To measure the unicorn, I'm going to start my count from 10, but I'm going to count back so I will say, nine and then I can stop because I've reached the top of the unicorn, I only needed to count back one number.

The unicorn is nine blocks tall.

Well done, if you spotted that the panda is 14 blocks tall and the unicorn is nine blocks tall.

Now it is time for you to go and do a little bit of work.

You are going to use dominoes to measure the length of each object.

I would like you to find out how long is this carrot? How long is this ribbon? How long is this rope? And how long is this parsnip? Look really carefully at how many dominoes long each object is.

Sophia says "That you could find where the 10 is and write that on to help you.

Once you've measured the length of those objects, you are going to have a go at measuring the height of these toys.

I want you to find out how tall is the teddy bear.

How tall is the princess and how tall is the robot? Again, you can use the 10 blocks to help you so that you don't have to count all the blocks every time.

Are you ready to go and do some measuring? Excellent.

Off you go.

Well done everybody.

Let's have a look and see if you have measured these objects.

I can see the end of the carrot is just here.

If I count those dominoes, I can see there are 1, 2, 3, 4, 5, 6.

The carrot is six dominoes long.

The ribbon, the end of the ribbon is here so I could start my count from the beginning and I could say 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

The ribbon is 12 dominoes long.

If you marked where 10 dominoes were, you wouldn't have to count them all again, would you? You could start your count from 10 and you could just say 11, 12.

Let's see if we can do the same for the rope.

I can see the end of the rope is here.

If I mark where the 10 dominoes are and I start my count from 10, I can say 11, 12, 13, 14, 15.

The rope is 15 dominoes long and lastly for the parsnip I can see that the parsnip ends here.

If I count those dominoes, I can see there are 1, 2, 3, 4, 5, 6, 7.

The parsnip is seven dominoes long.

Well done if you've measured those correctly.

Good job.

On the second part, you needed to measure the height.

Starting with the teddy, I can see that the top of the teddy lines up with this block.

I'm going to start my count from 10 and I could say 11, 12, 13, 14, 15, 16, 17.

The teddy is 17 blocks tall.

For the princess, I could start my count from 10 and I could count back 'cause I can see the princess is shorter than 10 blocks.

I start my count from 10 and I count back.

I would say 9, 8.

The princess is eight blocks tall.

And finally the robot.

I can see the top of the robot is here.

I could start my count from 10 and I would say 11, 12, 13, 14, 15.

The robot is 15 blocks tall.

Well done if you use the blocks to find out the height of each of those toys.

Now you are going to start the second part of the lesson and you are going to learn about how you can measure length using objects accurately.

You need to find out more about what that word accurately means.

Let's have a look.

Lucas and Sophia are trying to measure the length of this pencil using building blocks.

Let's see what they do.

Sophia says, "1, 2, 3, 4.

I think the pencil is four blocks long." Lucas says, "1, 2, 3, 4, 5, 6.

I think the pencil is six blocks long." Why have they got different numbers? Do you notice anything about the blocks that they've used to measure the pencil? Well done if you have spotted that they have used different-sized blocks.

Some of Lucas's blocks are smaller, aren't they? When you measure length using objects, it's really important to use the same size object each time.

Sophia did use blocks that were all the same size and she said the pencil is four blocks long.

If Lucas changed his blocks and used the same size blocks like this, he now says, "I also think it is four blocks long now that I have used the same size blocks as you." It is really important to choose blocks that are the same size if you want to use them to measure length.

When you use equipment carefully to measure something, it is called working accurately.

Accurately means that you're being very careful not to make a mistake.

Sophia says, "I could use blocks accurately to measure the length of this toy car.

Let's see what she does.

First, she's imagining lines at each end of her toy car so that she knows exactly where to start and finish.

She's going to place her blocks from one end to the other and we can count them with her.

Ready? 1, 2, 3, 4, 5, 6, 7.

The toy car is seven blocks long.

Sophia has measured the car accurately.

Now Lucas is going to have a go.

Lucas says, "Watch me Sophia, am I measuring this toy car accurately?" See what you think.

Lucas is placing lines so that he knows where each end of the car is and he's placing cubes.

1, 2, 3, 4, 5 Do you think that Lucas has measured this car accurately? Let's see what Sophia thinks.

She says, "No, you've left gaps between the blocks." It's really important when you measure accurately that there are no gaps.

This is what they need to look like.

The toy car is seven blocks long.

Lucas is going to have another go.

He says, "I will not leave any gaps.

Am I measuring this toy accurately?" Here are the lines so we know where the ends of the object are.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Do we think Lucas has measured accurately this time? Let's see what Sophia thinks.

She says, "No, you need to place the blocks in one straight line." Lucas remembered not to leave any gaps, but now the line isn't straight.

This is what it should look like.

The toy car is nine blocks long.

Lucas isn't going to give up.

He's going to have another go.

Let's watch what he does this time.

1, 2, 3, 4.

Lucas said, "The blocks are in one straight line with no gaps.

Am I measuring accurately now?" What do you think? Has he measured accurately? Sophia says, "You are close but you forgot to start and finish at the ends of the car." He got them in a lovely straight line with no gaps, but he just didn't start and finish right at the ends of the car.

This is what it should have looked like.

The toy car is five blocks long.

Lucas is going to watch Sophia measure accurately again and then he's going to have another go.

Let's watch Sophia and see what she does.

Here are the lines so that she knows where the ends of the object are.

She says, "Put the first block at one end of the car." There it is.

"Place more blocks in one street line until you reach the other end of the car." Let's count them along and see what happens.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

This car is 10 blocks long.

Now Lucas is gonna have one more go.

He says, "I think I know how to measure accurately now.

Please will you watch me and check." Let's all watch Lucas and see if he can measure this car accurately.

Here are the ends of the car.

1, 2, 3, 4, 5, 6, 7, 8.

The car is eight blocks long.

You have measured accurately.

Well done, Lucas.

Watching Sophia has really helped him and he didn't give up, did he? He kept on trying and now he has learned how to measure accurately.

Well done, Lucas.

Lucas and Sophia have gone to measure some other objects now.

Let's check if you can spot who has measured accurately.

Can you see what mistake the other person might have made? How could you help them to be more accurate? Pause the video and have a think about that.

Well done.

Did everybody spot this time? Lucas is the person who has measured accurately.

He says the carrot is four dominoes long and he is right.

His dominoes are in a straight line with no gaps and they go from one end of the carrot to the other end.

This time Sophia got muddled up and she hasn't measured accurately.

Sophia's pens should be in a straight line like this.

Sophia says, "I forgot to put the pens in a straight line.

The tablet is four pens long.

Well done if you spotted that Lucas had measured accurately and you knew how to help Sophia out as well.

Now it is time for you to go and do some accurate measuring.

You're going to choose something that you would like to measure.

It might be a toy that's around you or a pen or a pencil, something that you can have that you would like to measure.

Then you need to choose the objects that you want to use to measure length.

Remember so far in this lesson, we've used dominoes and we've used sharpeners and we have used blocks, but you could choose something different.

Sophia just used pens, didn't she? So choose your object that you want to use to measure and then use them to measure accurately.

How tall or how long is your object.

Lucas is going to show you an example.

This is the work that you are going to do.

Lucas says, "I want to measure the height of this Teddy." He's looked at where the top of the teddy is.

He says, "I will use building blocks to accurately measure the teddy." 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.

The teddy is 14 blocks tall.

Sophia says, "Make sure that the objects you choose to measure with are the same size." So if you choose blocks, make sure all your blocks are the same size.

If you choose pens, make sure all your pens are the same size.

Otherwise, it is not accurate measuring.

Are you ready to go and do some measuring now? Excellent.

Off you go.

Well done, everybody.

Let's have a look at what Sophia and Lucas did and you can think about whether you did something similar.

Sophia measured the length of this rope accurately using pens.

She placed her pens in a straight line like this and she counted them.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.

She says the rope is 15 pens long.

Did you make sure that your objects were in one straight line like Sophia's? Well done if you did so that's really important for accurate measuring.

Let's see what Lucas did.

Lucas measured the height of this robot accurately using blocks, 1, 2, 3, 4, 5, 6, 7.

Then he stopped because he can see the top of the robot lines up with seven blocks.

The robot is seven blocks tall.

Did you make sure that all your objects were the same size like Lucas? Well done if you did that.

That is really important for accurate measuring too.

Now that you are at the end of the lesson, you have learned that you can measure length including height by using different objects.

You know that to measure accurately, it is really important that the objects you choose are the same size that you place them in a straight line, you don't leave any gaps in between the objects and you start and finish at the ends of the object that you are measuring.

Well done for all your hard work today.

You have really learned a lot about how you can use objects to measure length accurately.

Well done everybody.

I hope that I will see you again soon for some more maths learning.

Bye everyone.