Lesson video

Hello, welcome to today's math lesson.

You've got me Ms. Jones and I'm looking forward to doing some maths together today.

Hope you're feeling well.

Make sure you're in a quiet space and you're ready to learn.

Right, let's get started.

In today's lesson, we are going to compare the mass of more than two objects.

We'll start by reminding ourselves what we mean by mass and comparing mass.

Then we're going to describe objects using the vocabulary of maths.

Words like heavier and lighter.

Then you've got a task and finally there is an ends of lesson quiz.

You'll need something to write with and something to write on like a pencil and a piece of paper.

You'll also need some objects to compare.

Now these can be objects from your room, put some of your toys, perhaps such as a teddy bear or a doll or they could be household items, such as a cup or a box.

But before you gather all your items, check with your parents or carer about which items you can use.

You'll need a range.

So maybe five to six items. Okay, if you haven't got your items already, pause the video and go and get them.

If you're ready to go, let's begin.

Let's have a look at our balance scale.

Here we have a cow and a horse.

Our scales are balanced.

Which one is heavier? Which one is lighter? At the moment, neither is heavier and neither is lighter.

They both weigh the same.

How do we know the cow and horse weigh the same? We know the cow and horse weigh the same, because the scales are balanced.

They're at the same height.

If they were unequal, the scales would be unbalanced and move.

Let's have a look at another example.

Oh, here we've got two pieces of fruit.

Can you explain what's happening here using the words heavier and lighter.

Pause the video now to have a go.

Let's have a look together.

My turn, your turn.

That banana is lighter than the orange.

The orange is heavier than the banana.

Well done.

How do you know that the banana is lighter? Well, I know that banana is lighter because it's got a larger height on the scale.

I know that the orange is heavier because it's lower on the scale compared to the banana.

The heavier objects caused the scale to move down.

Pause the video now to see if you can have a go at explaining that.

Okay, let's move on.

Which one is heaviest? Which one is lightest? How do you know? Pause the video now to try and explain.

Hopefully you've had a go at explaining.

I know that the teddy bear is heavier because the scale is lower on that side.

I know that the chocolate is lighter because the scale is higher on that side.

The teddy bear is heavier than the chocolate.

The chocolate is lighter than the teddy bear.

Did you have a go and use some full sentences of your own? If not, see if you can give me a full sentence now.

Okay, let's move on.

Here is a set of weighing scales.

I'm going to put an apple on this side and a marble on this side.

The apple is heavier.

So my scale is lower on this side.

The marble is lighter.

This time, I'm going to put my apple here and I'm going to add a book and a marble.

When I had just the marble, my marble was lighter, but now I've added a book, my book and marble combined is heavier than my apple.

The book and marble is heavier than the apple.

It has a greater mass.

What could we say about the apple? Well, we could say the apple is lighter than the book and the marble put together.

Let's see what happens this time.

Got our apple and a button.

On this side, we've got a pencil and a paperclip.

Which do you think is heavier looking at the picture? Well, I can see that the button and the apple are lower on the scale.

So they are heavier than the pencil and the paperclip put together.

They have a greater mass.

We can say that the paperclip and the pencil together, are lighter than the apple and the button.

Can you say that? Have a go at explaining.

Now it's time for your independent task.

Here are some scales.

I want you to find some objects in your household and think about which ones would go on the scale as heaviest.

You might want to try and combine.

Use different combinations.

So I used an apple and a paperclip or a pencil and a book.

You might want to try and use some combinations as well.

Once you're done, I'd like you to pick a combination to write a sentence with.

The hmm and the hmm are heavier than the hmm and the hmm.

These blanks, you'll have to fill in with your own objects, depending on what you're using today.

Once you've done this sentence, can you make a sentence with the word lighter? And your challenge today is to find a combination of objects that you think would balance on the scale that are roughly the same mass.

Now the challenge is, can you have more than one object on each side? So can you find some combinations of objects that balance? Time to pause the video and go off and complete your task.

Hope you have fun.

Now that you've done your task, if you want to, you can ask your parents or carer to share your work.

Once you finished everything, make sure you have a go at today's multiple choice quiz.

I hope you had fun today, measuring and comparing different objects mass.

Thanks guys, well done.