Lesson video

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Hi, everyone, I've just been sorting through a memory box and this caught my eye, I am one.

I haven't worn this badge in quite some time as you'd imagine, but I think it's probably the oldest thing that I own.

Certainly the oldest thing in my memory box.

I wonder what the oldest item is that you have and whether you will still have it in years to come like I do with this badge.

Right, I think I'm ready to start the maths lesson.

I'm in a quiet space.

I'm destruction free, and I'm ready to give you my full attention for the next 20 minutes.

But the question is, are you ready? If you need to take yourself away into a quieter room, please press pause and do that now.

And come back when you're ready to start the lesson.

In this lesson, we will be converting between units of measurement.

We're going to start off with a short activity where we'll be matching different units of measurement that are equivalent before we spend some time recalling common measurement benchmarks.

I'll remind you what I mean by that.

Then we will explore the connections between kilometres and metres, kilogrammes and grammes, and litres and millilitres.

All of that will set you up for the independent task to end the lesson.

Items that you're going to need: pen or pencil, some paper and a ruler.

Press pause, get yourself sorted with those items, come back and we'll start.

Okay, let's begin.

Match the measurements.

Notice on the screen there are millimetres, centimetres and metres.

Some of the values are equivalent.

Press pause, have a look.

See which ones you're able to find and match up.

Come back and we'll check.

Are you ready to take a look? Okay, hold up your paper with your working, your solutions on.

Let me have a look.

Good, so we've been able to match up, for example, certain number of millimetres, a certain number of centimetres that are worth the same amount.

Let's have a look at the rest.

So 30 centimetres equivalent to 3/10 of a metre, 30/100, 30 centimetres.

Next, 50 centimetres equivalent to 1/2 a metre, 50/100, 1/2 a metre.

25 centimetres, good, 1/4 of a metre.

25/100, 0.

25 equal to one quarter of a metre.

What's that one equivalent to? Did you see it go? There it is, seven millimetres equivalent to 7/10 of a centimetre.

7/10, seven millimetres.

Next, 10 centimetres.

Good, 1/10 of a metre, 10/100 of a metre, 10 centimetres.

Next, 75 centimetres.

3/4 of a metre, 0.

75, 75/100 equal to 3/4 of a metre.

And that leaves us with five millimetres equal to 1/2 a centimetre.

Really good start.

Some parts here that we've been recalling from previous learning.

And we've been checking on our ability to match up those equivalent measurements.

Okay, units of measurement.

We can measure and find out lengths and heights, masses and capacities.

When we're measuring masses, we use grammes and kilogrammes often.

There are others as well, but for this lesson, we're focusing on these two units.

It's helpful to have some benchmarks in mind so that we know roughly how a certain number of grammes or kilogrammes feels, looks.

So for example, one paper clip is approximately one gramme or one bag of sugar, full bag of sugar is approximately one kilogramme.

With those benchmarks in your mind, if I asked you to estimate the mass of a chair, for example, the chair I'm sitting on.

You could use the benchmark of, "Well, one gramme is a paperclip, one bag of sugar is a kilogramme.

So the chair is probably.

." And it supports the estimation.

When it comes to capacity, we'll be looking at millilitres and litres today.

And the common benchmarks for you.

One teaspoon holds approximately five millilitres of liquid, whereas a carton of juice holds one litre of liquid.

So again, if I asked you, "Okay, in this cup, how much liquid could it hold?" You would think, "Well, a teaspoon, five millilitres, a carton of juice, one litre, a thousand millilitres.

So I think the cup would hold.

." And you make your estimate.

Finally, length, today we're just looking at these two units and our benchmark for metres is that metre stick.

I made a metre stick.

It's just made out of paper and I used 3 1/3 30-centimeter rulers to make it.

So I measured up three lots of 30, 90, and 10 centimetres to make my 100.

One metre stick, 100 centimetres.

With this common benchmark in my mind, if I'm estimating lengths, I can compare the length, the height, the distance to the metre stick.

When it comes to kilometres, I'm thinking more when there's a greater distance to measure like the distance between two cities or two towns, for example.

Units of measurement, grammes and kilogrammes, millilitres and litres, metres and kilometres, millimetres and metres.

As we look at these, does anything stand out to you? Anything that's the same? Anything that's different? Ah, you've noticed the prefix kilo in kilogramme and kilometre.

Is there another prefix you've noticed? Milli, millilitre, millimetre.

These have some meanings.

Kilo means 1,000 times.

And Milli means 1000th of.

Those two prefixes help us when we're thinking about grammes and kilogrammes, millilitres and litres.

1,000 grammes is equal to one kilogramme.

1,000 millilitres is equal to one litre.

One millilitre is 1/1000 of one litre.

One millimetre is 1/1000 of one metre.

One kilogramme is 1,000 times the size of one gramme.

One litre is 1,000 times the size of one millilitre.

I wonder if you could say any of those sentences.

Say a sentence for me about millimetres and metres.

Give me, sorry, give me the sentence first using thousandth of.

How would you say that? Let's have a go together.

One millimetre is 1/1000 of a metre.

You say that sentence but for metres and kilometres.

So one metre is 1/1000 of one kilometre.

Say it for grammes and kilogrammes.

One gramme is 1/1000 of one kilogramme, good.

Let's try it now from the larger unit.

So for example, from kilogrammes to grammes.

My turn, one kilogramme is 1,000 times the size of one gramme.

You have a go for litres and millilitres.

Good, one litre is 1,000 times the size of one millilitre.

Try it for kilometres and metres.

Good, one kilometre is 1,000 times the size of one metre.

Let's both say it for metres and millimetres, ready? One, two, three, one metre is 1,000 times the size of one millimetre, good.

Let's start thinking about those connections then.

First of all, grammes and kilogrammes.

1,000 grammes is one kilogramme.

One gramme is 1/1000 of one kilogramme.

One kilogramme is 1,000 times the size of one gramme, okay.

So what's missing in those empty boxes? Have a go, come back when you're ready.

Ready, tell me.

2,000 grammes is equal to two kilogrammes.

3,000 grammes is equal to three kilogrammes.

500 grammes, five kilogrammes? 1/2 a kilogramme, 0.


And we can think about the fractions there.

500 grammes is 500/1000, 0.


Whereas 3,000 grammes is 3000/1000, three.

2000/1000, two.

Let's go the other way.

Kilogrammes to grammes.

Take a moment to fill in those missing numbers.

Come back and we'll check.

Are you ready? So one kilogramme is 1,000 grammes.

So five kilogrammes is? Good, seven kilogrammes? 0.

75 kilogrammes, 75 grammes? 75,000 grammes, what is it? It's less than one kilogramme.

It's 750/1000 of a kilogramme, 750 grammes.

Look at those fractions again.

7000/1000, 5000/1000, five kilogrammes.

Let's have a look now, millilitres and litres.

So same again.

Press pause if you want to.

Fill in those missing numbers, then come back and we'll look, ready? One millilitre is 1/1000 of one litre.

One litre is 1,000 times bigger than one millilitre.

1,000 millilitres, one litre.

500 millilitres, five litres? It's not a litre, it's 500/1000, 0.


It's 1/2 a litre.

200 millilitres, 0.

2 litres, 200/1000.

And 100 millilitres, 0.

1, 1/10 of a litre.

10/100 of a litre, 100/1000 of a litre.

It's not a whole litre.

It's less than 1,000.

There are the fractions that we've just been saying to match each of them as well.

How about from litres to millilitres? Press pause and take a moment to fill in the missing values.

The equivalent values as millilitres.

Are you ready to look? Okay, so one litre, 1,000 millilitres.

So two litres, good.

Hmm, 0.

4 litres.

So it's not 1,000.

It's smaller than 1,000.

It's not a whole litre, it's part of a litre.

How much of a litre is it? 400/1000, 400 millilitres.

And the last one.

Good, 600/1000, 400/1000, 2000/1000.

Metres and kilometres, pause, fill in the missing values.

Come back when you're ready.

Shall we look? One metre is 1/1000 of one kilometre.

One kilometre is 1,000 times the size of one metre.

100 metres, hmm.

It can't be a kilometre because it's smaller than a thousand metres.

So what is it? It's 1/10 of a kilometre.

It's 100/1000.

Next, 10 metres.

What would that be? 0.

01 of a kilometre.

1/100 of a kilometre, 10/1000 of a kilometre.

And so the other, the final one, 50 metres, 0.

05, 5/100, 50/1000 of a kilometre.

How about from kilometres to metres? Pause, fill in the gaps.

Come back when you're ready.

Shall we check? So one kilometre is a thousand metres.

So 0.

5 of a kilometre, 1/2 of a kilometre was 1/2 of 1,000, 500 metres.

Next, 6/100, 60/1000, 60 metres.

Three kilometres, okay.

So we're bigger than one.

Bigger than 1,000, 3,000 metres.

3000/1000, 60/1000, 500/1000.

I would like you now to work on matching the equivalent measurements.

In here, we've got kilometres, metres, grammes, kilogrammes, millilitres and litres.

And there are pairs of equivalent values to find.

Press pause, go and complete the activity.

Come back when you've sorted them and we'll check.

Let's take a look.

Now, there's a lot of information on the page.

I found it useful to start off by grouping the units as units of measurement of length, mass and capacity, which ended up looking like this.

So three groups.

Then I was able to focus on one group at a time, starting with measurements of length.

And I'm looking through this list.

Where are any equivalent pairs? So what did you find in this list? Good, first, 0.

1 kilometre, it was able to match with 100 metres.

Two kilometres with 2,000 metres.

1,000 metres with one kilometre and 0.

1 kilometre with 10 metres.

Did you match those ones up as well? Well done, big thumbs up.

How about for mass? Tell me one pair that you were able to find.

Tell me another pair you were able to find.

Let's take a look.

Say 20 grammes, 0.

02 kilogrammes, 20/1000.

2/10, 20/100, 200/1000 matches with 200 grammes.


5 kilogrammes with 1,500 grammes and finally one kilogramme at 1,000 grammes.

How did you get on with the measurements of mass? Good, final group.

Capacity, not as many here.

Easier to see within the set.

Tell me one that you were able to match up.

And the other, good.

So we've got 1,000 millilitres and one litre.

500 millilitres and 1/2 a litre, 0.

5 of a litre.

Hold up your paper, let me see how you got on.

Busy pieces of paper, aren't they? Some, I can see that you've started to organise into groups.

I wonder if that helped with your success today to really think about how you would approach the problem, how you could make all of those numbers a little bit easier to find within the mix.

If you would like to share any of your work from this lesson with Oak National, please ask your parents or carer to share your work on Twitter tagging @OakNational and #LearnwithOak.

Fantastic learning in this lesson, everybody.

Really pleased that you were able to join me and to have some fun at looking at different units of measurement and finding connections between them.

I am going to return my oldest memento to my memory box and then perhaps have a little sort through and see what else I can find in there.

What are you going to do next? Do you have some more learning lined up? Or are you able to have some free choice time? Whatever you're doing, I hope you enjoy it.

And I look forward to seeing you again soon for some more maths, bye.