Lesson video

Hi, friends.

It's Miss.

Molnar here and Harold the Hedgehog, and we are here to do some maths learning with you today.

Today, we are going to be consolidating our learning all about weight, and how heavy or how light something is.

Well, you're not going to need to get anything ready for this lesson except your thinking brain, so make sure you've got your thinking brains ready, everyone, and then we can get started.

Okay.

Let's recap some of the language that we might've learned already with our weight.

So, I say, you say.

Balanced.

Well done.

Balanced is when both sides of the scale are at the same level.

So that means the weight is equal to each other.

I say, you say, lighter.

Well done.

So remember, the scale, when something is lighter, the scale will go up on the side that is lighter.

I say, you say, heavier.

Well done, heavier.

So, we will know that an item is heavier on a scale when the scale gets weighed down on one side.

We know that that side is the heavier side.

All right, so let's take a look at this scale that we've got here, this balance scale.

We've got an apple on one side and we've got three apples in a bag on the other side.

Which side of the scale is showing to be the heavier side or the lighter side? So, we've got a sentence here that says the bag of apples are hmm than.

Okay, so.

Are the bag of apples lighter than the one apple, are they heavier than the one apple, or are they balanced and the same? Have a think.

See if you can fill in the sentence for us.

If you said the bag of apples are heavier than the one apple, you are right.

We can see on the scale that the bag of apples has a larger weight or a heavier weight than the one apple.

Well done.

All right.

Now we've got some eggs here.

Mm, making me think of breakfast.

So, we've got an egg on either side of our scale.

Now, let's see if you could have a think again.

Which side is the heavier side? Which side is the lighter side? Or are they the same? Have a think.

Ooh, Harold's having trouble with this one.

He's not sure which one is heavier or lighter.

What did you say? If you said the eggs are balanced or they're equal, that's right! You're so right, because they weigh the same amount.

They're the same size.

The balance scale would be equal on either side.

One of them isn't heavier or lighter than the other.

Way to go, everyone.

All right, we've got another one here to try.

So, on one side of the scale, we've got one carrot.

On the other side of the scale, we've got some bananas.

Oh, it looks like Harold is getting hungry here.

He loves fruit.

What do we think, friends? Are the scales balanced? Let's think about the sentence.

The carrot is hmm than the bananas.

Is the carrot lighter? Is the carrot heavier? Look at the balance scale and have a go at explaining in a sentence.

Well done.

If you said the carrot is lighter than the bananas, you're right.

Well done.

We can see on the scale that the banana side of the scale has weighed down the scale, so that means it's the heavier side.

Oh, right.

Now that we've done a little bit of recapping on our heavier and lighter, we've got a little bit of a question for you.

We need some help.

Don't we, Harold? Now, Harold and I have gotten a little bit of a disagreement, but that's okay, I'm sure you can help us solve this.

So, we've got Miss.

Molnar's bag, purple bag, on the one side of the scale.

And we've got three of Harold's balls that he likes to play with outside on the other side of the scale.

And Harold says, "Well, there's only one bag, Miss.

Molnar, and I've got three of those red balls.

So surely anything that's three of, is going to weigh more than one of something." So, Harold seems to think the scale is broken.

He doesn't think that one thing could be heavier than three things.

Hmm, but I'm seeing the purse being weighing down.

It's weighing down the other side.

I don't really think the scale is broken.

What do you think? Is it possible for three things to be lighter than one object? Have a think.

Pause the video if you need some time to talk out loud and have a think.

Is the scale broken, or what do you think? All right, well hopefully you paused the video and you had some time to think about this question.

So, what did you think? Was the scale broken? Should the purse be lighter than the balls, because it's only one thing? If you said the scale's not broken, you're right! Because it doesn't matter how many objects there are, it's all about how much it weighs or how heavy the object is.

So even though there's only one bag, that bag is heavier.

It's got a greater weight, or a greater mass than the three of the red balls combined.

So even though there's three of them, it doesn't mean it's actually heavier.

One object can be heavier than three objects combined, okay? It'd be different if it was three of the same purses.

If we had three purple purses on the other side of the scale, surely that would be heavier than one purple purse.

But the bag, the purse is heavier than all three of those red balls combined.

That was a little bit tricky 'cause sometimes we think that the more of something we have, the heavier it's going to be, but that's not always the case.

Well done for some excellent thinking there.

That was a tricky question, everyone.

All right.

So, we're going to go into our main task now.

We've got another really tricky question here.

Okay.

So, again, Miss.

Molnar and Harold have come to a disagreement again.

My goodness, we've got lots of disagreements today.

Hopefully, you can help us out again.

So, we've got a picture of a tennis ball and a beach ball.

Now, I think because the beach ball is bigger, it's a huge, it's much bigger than the tennis ball, so I think the beach ball is going to weigh more, it's going to be heavier than the tennis ball, because it's much larger than the tennis ball.

But Harold does not think so.

Hmm.

Harold's been thinking about the material that a beach ball is made out of, and he's thinking about a tennis ball, and he thinks, "Nope." He thinks that the tennis ball is surely heavier.

I just don't think it's possible.

The tennis ball is tiny and the beach ball is really big.

So, I think a beach ball must surely be heavier.

So, what we'd like you to do is to pause the video and have a think right now and seeing if you can do some explaining about whether or not the beach ball or the tennis ball is heavier.

Have a think.

All right, hopefully you had time to think and explain that when you paused the video.

What did you think? Did you think, did you agree with Miss Molnar, that the beach ball would surely be heavier? Or the tennis ball be heavier? And why do you think that? Oh, well it seems that Miss.

Molnar was wrong.

Again, just because an object is bigger, doesn't make it heavier, okay? A beach ball is filled up with air.

We blew it up, don't we? You fill it up, the beach ball.

It's just filled with our air.

It's not very heavy, and that's so we can hit it around on the beach or by the seaside, whereas a tennis ball is made from some different material, and makes it much heavier because it's not just made of air.

So, even though a beach ball, oh sorry, even though a tennis ball is much smaller, it is heavier, okay? So, this is what we want you to do.

We want you to investigate today.

Can larger objects weigh less? So, we want you to ask a parent or carer to help you, and we want you to have a little bit of a hunt around your house.

Can you find some objects to compare? So, you're going to find two objects.

One small object and one large object.

But the goal is to find a large object that weighs less than your smaller object.

So, maybe you're going to find a set of keys, okay? Even though the keys might be really small, they could be heavier than say, a piece of paper, okay? So, we want you to find two objects that are different sizes, and we want you to see if you can find that the bigger object actually weighs less.

This is quite a tricky challenge today, so we're hoping you can find lots of things to compare and find out that actually, sometimes it's not always about the size.

You might still find some bigger objects that do weigh more.

But again, we want you to find the ones that weigh less than a smaller object.

All right.

Well, we're ready for you to get off on your hunt, all right? On your marks, get set, and hunt! All right.

What items did you find around the house? Were you able to find some larger items that were actually lighter, they actually weighed less than a tinier item? Well, what did you find? Well, I'm sure your teacher would love to see all the items that you found that were heavier or lighter than.

So, if you took some pictures of your learning, I'm sure they would love to see it.

And of course, Harold and I would be really interested to see what lighter and heavier items you found around the home.

So, if you'd like to, you could ask a parent or carer to share the pictures with us on our social media at Oak.

Well, that's all we have time for, I'm afraid, today, but we really hope you enjoyed your learning, and we hope that you enjoy the rest of your lessons today.

All right, everyone, we'll see you next time.