Lesson video

Hi there, my name is Miss Darwish, and for today's maths lesson, we are going to be converting between metric units of mass.

So I will explain everything later.

Before we get started, if I could just ask you to take yourself away from any distractions, just so you're ready for the lesson.

So our agenda for today is, first of all, we're just going to discuss and talk about mass, as a reminder, and then there's a sorting activity for you to do followed by a few conversions, and then at the end of the session, as always, there will be a quiz for you to complete on today's lesson.

So, for this lesson, if you could just grab a pencil and a sheet of paper, and it would be handy to have a ruler close by as well.

Okay, ready to start? So mass, when we talk about mass, what do I mean? Okay, when we talk about the mass of objects, we're talking about the weight of the actual object, okay.

So mass is important to me because I absolutely love baking.

Baking cakes, baking cookies, cake pops, you name it, donuts, I absolutely love baking and spending time in the kitchen.

So for me, it's important that I measure my ingredients out carefully and accurately.

What about you? Do you like baking? Have you measured something before? When was the last time you measured something? Okay.

So here's a bit of a sorting activity.

There is a person standing on a scale.

There is an elephant, I think it's a quite good elephant, drawn by me on the computer, of course, and a bag of flour.

Okay, what would we use to measure these things? Have a think.

And also, I want you to have a think about what the weight or what the mass of all of these things are.

So what might the mass of a bag of flour be? Maybe you go to the supermarket with your parents or your carers, and you notice, or you've read on the bag of flour, how much it is.

What might the mass of an elephant be? And what about your weight, when you stand on the scales, do you know how much you weigh? Okay, these are all things to think about.

Now, when we talk about mass, we're going to be talking about kilogrammes and grammes, okay.

So we're sticking to metric units, units that we're more familiar with here in the UK.

So one kilogramme is equivalent to 1000 grammes.

And how do we know that? Because Kilo means 1000.

So one kilogramme is equivalent to 1000 grammes, well done.

Okay, if I asked you then two kilogrammes? How many grammes are in two kilogrammes? Okay, well done if you said 2000 grammes.

Two kilogrammes, 2000 grammes.

What about if I gave you the grammes this time? How many kilos, how many kilogrammes in 7,000 grammes? Well done if you said seven kilogramme.

So for one kilogramme, 1000 grammes.

Seven kilogrammes, 7,000 grammes.

What about if I said five kilogrammes? 5,000 grammes.

What about if I said 6,000 grammes? That would be six kilogrammes.

Easy.

Okay.

Have a look.

I'm going to give you a few seconds just to read over that and then we can go through it together.

So in five kilogrammes, there are how many grammes? In 9.

5 kilogrammes there are how many grammes? And then you've got to convert from grammes to kilogrammes.

I'll give you a few seconds to read through that, and if you want to jot anything down, then go for it.

Okay, should we have a look together now? Maybe you've had time to have a look, okay.

So five kilogrammes, so a thousand grammes, so 5,000 grammes, five kilogrammes is equivalent to 5,000 grammes, 9.

5 kilogrammes, 9,500 grammes.

Well done.

What about 4,600 grammes? 4.

6 kilogrammes, well done.

And 12,800 grammes? 12.

8 kilogrammes.

Just look over that, I'll give you a few seconds to look over that.

Okay.

Easy.

Okay, now this time there is a mistake.

A mistake has been made in the conversions.

Can you spot it? Again, I'm going to give you a few seconds just to read through that.

Which ones are correct? Which ones are not correct? Okay, first one, 3000 kilogrammes is the same as three grammes.

Definitely, definitely, definitely not.

Why? 3000 kilogrammes is a lot of grammes.

you remember.

In 1000 grammes is one kilogramme, okay.

So three kilogrammes is 3000 grammes, not the other way round.

What about 9.

5 kilogrammes, is that 95,000 grammes? 9,500 grammes in nine and a half kilos.

So nine kilogrammes is 9,000 and half a kilogramme is 500.

Okay, 4.

6 kilogrammes next, is that 460 grammes? 4.

6 kilogrammes, four kilogrammes is four thousand, So point six would be 600, 4,600 grammes.

Okay, and then the last one, 128 kilogrammes.

What's that the same as in grammes? I'll give you a few seconds.

Ready? 128,000, 'cause we're saying 128 kilogrammes, it means 128, replace the word kilo with thousand, 128,000 grammes, okay.

Let's read through them, and instead of saying the word kilo we're going to read the kilogrammes, instead of saying the word kilo, we're going to replace it with the word thousand.

Are you ready? 'Cause Kilo means thousand.

Say three kilogrammes, 3000 grammes, 9.

5 kilogrammes, 9.

5 thousand grammes, 4.

6 kilogrammes, and 128 kilogrammes? Okay, let's move on.

Right, well done.

So now it is time for you to go and complete the independent task for me on conversions and converting between grammes and kilogrammes.

Once you've had a go at that, and you've checked through your answers, then come back and we will go through them and mark them together.

Good luck.

Hi there, welcome back.

How was that? Did you find that okay? Okay, should we go through the answers together now? So you were asked to put a tick next to the correct conversion.

So if the grammes and kilogrammes were correctly converted then put a tick, and then a cross if they were not correct, and to correct them.

So let's see how you got on.

So we've got our grammes and our kilogrammes.

So, which ones do you think were correct? And which ones do you think were incorrect? Let's have a look, see if you were right.

The first one, 1,500 grammes.

Is that the same as 1.

5 kilogrammes? Yes, 1.

5 thousand grammes, 1,500 grammes, definitely correct.

So well done if you said the first one was correct.

Okay, what about the second one, 2,300 grammes, is that the same as 23 kilogrammes? Definitely not, that second one is not correct.

23 kilogrammes would be 23,000 grammes, remember we're going to replace that word kilo with thousand.

23000 grammes, but that doesn't say that, it says 2,300 grammes.

So if it was 2,300 grammes, then what would the right conversion be in kilogrammes? So what is 2,300 grammes in kilogrammes? 2.

3 kilogrammes.

Okay, what about the third one? 600 grammes, is that the same as 0.

6 kilogrammes? Yes, we know it's definitely smaller than one kilogramme because one kilogramme is 1000 grammes, and 600 grammes is smaller than 1000 grammes.

It is smaller than one kilogramme, so it is 0.

6 kilogrammes.

Okay, well done if you said that one was correct.

And then the last one, 48,000 grammes.

Okay, 4.

8 kilogrammes? Definitely not.

48,000 grammes would be the same as 48 kilogrammes.

See what I did there? Instead of saying 48,000 thousand, I said kilo.

So 48 kilogrammes, or if it was 4.

8 kilogrammes, the right conversion in grammes would be 4,800.

Okay.

So have a look at that and just see what your answers are.

If you converted them the other way, then it doesn't matter either.

So remember the first one and the third one were correct, and the second and the last one were not correct.

Right, if you got that right, give yourself a really big tick, but if you made any mistakes, then don't worry, as long as you can see where you went wrong and just correct them for me now.

Okay, brilliant.

So, just want to say well done on that learning.

So if you would like to share your work with us here at Oak National, then please do ask your parent or your carer to share your work for you on Twitter, and ask them to tag @OakNational, and to use the hashtag LearnWithOak.

Well done on all the brilliant learning that you have done today on conversions, converting between grammes and kilogrammes.

Hopefully now you're a bit of an expert on that.

Okay, now it is time for you to go and complete the quiz for today's lesson.

Good luck.