Lesson video

Hi, friends, it's Miss.

Molnar here, and we are going to do some math learning today.

We are going to be talking all about objects that are heavy and light, and trying to compare which objects are heavier or lighter than each other.

And, of course, I brought my trusty friend along to help today, Harold the Hedgehog.

Say hi to Harold, everyone.

So, you're not actually going to need anything today for this lesson, except what's on the screen or in the worksheets.

Let's get started on our learning for today by talking about some of the language we might be using today.

So we've got three balance scales on the screen.

There's a blue one, a red one and a green one.

Can you see them? We want to use the words balanced.

balanced means equal or the same.

So, if you see one of the scales where both sides are at the same level, we would say that those are equal weight or they're balanced.

We're going to use the word lighter and we're going to use the word heavier.

So, if an object is lighter than another object, it's going to be raised up higher on the scale, if it's lighter.

And, if it's heavier, it's going to weigh more, so it's going to weigh down the other side of the scale.

So, we would like you just to pause the video for a minute and have a go describing some of the objects that you see on the scales.

So you might say, on the green scale, you might say the pink object is lighter than the marble because it's raised up higher.

So have a go at using some of the sentence stems and the words, and then we'll come back together.

Well done.

Were you able to describe some of the scales? What did you notice about the blue scale with the one large marble and the two small marbles? That's right, one large marble is the same weight or it's equal to two small ones.

They're balanced or the same.

Well done.

So now we're going to use our estimating skills.

Estimating just means making a good guess.

So we're going to make a good guess about which of these objects we think is going to be heavier or lighter, or if they're going to be balanced.

So, on one side of the scale, we're going to have one apple.

On the other side of the scale, we're going to have three apples in a bag.

So have a think right now.

Which object do you think, which side is going to be lighter? Which side is going to be heavier? And why? Point to the side that you think is going to be heavier? Well, my estimation is that the bag with the three apples I think is going to be heavier because, surely, three apples is heavier than one.

Is that what you think, as well? Let's see what's going to happen.

Were we right? The three apples is heavier than the one apple, and we can see that on the balance scale because it's weighing down that side of the scale.

The apple we know is lighter because it's raised up, it's higher on the scale.

Well done, everyone.

Our next objects that we're going to estimate which is going to be heavier, lighter or balanced is some eggs.

So we've got one egg on one side and one egg going on the other side.

So what do you think the eggs will be lighter? Do you think the egg on one side will be lighter than the other side, or heavier on the other side? Or do you think they'll be balanced, and why do you think this? Shall we find out? What has happened to the scales? If you said balanced, well done, they are balanced because we've put a similar size egg on both ends of the scale.

So, essentially, there'll be equal to, or the same weight.

Way to go, everyone.

Let's try one more.

We've got a yummy piece of chocolate and an egg, hmm.

Let's use our estimating skills and think why one might be heavier than the other.

Hmm, what do you think? We've got a little piece of chocolate and we've got an egg.

Using your knowledge about both of these items, which one do you think will be heavier, and why? So do we think the eggs will be heavier or the eggs will be lighter? Well, I think that the eggs will be heavier because it's a larger object.

And I know that an egg has got that yolk and the liquid inside, so I think it's going to be heavier than just one piece of little chocolate.

What did you think? Shall we find out? What can we see from the scales? That's right.

The egg ended up being heavier than the chocolate, or we could say the chocolate is lighter than the egg.

Way to go, friends.

So, for your talk task, we want you to have a go at this now.

So, you don't actually have these objects for you to weigh.

We want to focus on our estimating, or our guessing skills, and just using the knowledge that we have about these objects to think about which one will be heavier or lighter.

So, up above on the screen, we've got a banana, a carrot, a strawberry, a lolly, and we have three bananas.

So, we want you to choose two objects at a time and imagine you're going to weigh both of them.

And we want you to say whether or not you think the object, what object would be heavier or lighter, or if they'll be about the same.

So, if I was going to go first, I might pick the banana and the carrot.

Now, to me, these look like they're a similar size.

So I might say, you know what, I think the banana and the carrot will be balanced because they're about the same size.

So we want you to pause the video, have a go, choose two of the objects to compare.

Maybe you're going to do it twice.

And then say if it's going to be heavier or lighter or balanced.

Which items did you compare? What if we compared the three bananas to one banana? What do you think would have happened? Would one banana be lighter, or three bananas? That's right, if you said one banana would be lighter, you're right because, surely three of them than one banana would be heavier.

What about the lolly and the strawberry? What do you think about those items? It's hard to say, but they are a similar size, aren't they? They might equal the same.

Well done.

Now, for your main task, we're going to look at some pictures of some items. So, we've got a teacup, we've got a little fish, a leaf, a hat, we've got a cow, rhinoceros and a boat.

So we're going to think about what we know about these objects in the real world and think about, are they a heavy object or are they a light object? Are they something heavy or light? So, now I'm going to think, if I saw a boat out in the ocean, would I be able to lift it up? No, I would not be able to lift it up.

So I would class that object as heavy.

So what I would do is I would take the picture of that boat, or I'd get a parent or carer to help me write down boat, and I'd write it in the heavy side.

So over on the other side of the screen, you can see a chart that says heavy, with a circle underneath it, and you can see a circle that says light.

So, in the resources, you can also find this table to print out, but you could also have a parent or carer help you draw two circles and write heavy and light on both sides.

So, I would sort that boat to be on the heavy side, for sure.

Now I'm going to look at the leaf now.

Now, thinking about the leaf, do you think I would class that as a heavy object? No, it would be a light object because I can just pick up a leaf easily in my hand.

So, we want you to pause the video, have a go at sorting the different items and say, hmm, maybe what you think is going to be the heaviest object and why, maybe what you think is going to be the lightest object and why.

So we want you to sort the objects between heavy and light, and then we'll come back together.

How did this go, sorting the objects from heavy and light? What did you think would be the heaviest thing, the heaviest picture on that screen? Yeah, probably the boat.

I would say the boat was probably the heaviest.

A rhinoceros would also be really heavy, too, wouldn't it? What would you think would be the lightest object on those pictures? Yeah, I would say probably the leaf, as well.

Well done, boys and girls.

Well, we hope you enjoyed today's lesson.

I'm afraid that's all we have time for, but we hope you learned a lot about heavier and lighter, and using a little bit about a balance scale.

Well, hopefully you took some pictures today of all of your amazing effort with your learning, and I'm sure your teacher would love to see some photos of what you've been up to.

And, if you'd like, you could ask a parent or carer to share those photos with us at Oak.

We would love to see the amazing learning you've been getting up to today.

Well, hopefully, we'll see you next time, friends, for some more math learning.

Bye, everyone.