Lesson video

Hello everyone and welcome to maths with Ms. Dobrowlski.

In today's lesson will be interpreting scales and reading grammes.

So let's have a look at today's lesson agenda.

First, we'll learn about what grammes are.

Then we'll have our talk task.

Then we'll have a look at reading scales, and finally you'll be off to your independent tasks.

For this lesson you will need a pencil and do notebook.

If you don't have these items pause the video now and go get them.

Super so, which is heavier one gramme or one kilogramme.

Well, just looking at this image, we can see that one kilogramme is heavier than one gramme, and I use my greater than symbol for this.

So my turn, your turn.

One kilogramme is heavier than than one gramme.

Super.

We would actually need 1000 grammes.

So 1000 of these equal one kilogramme.

So one kilogramme is quite a lot heavier than one gramme.

Now let's have a look at reading this scale in grammes.

So what is the mass of the letter? Well, I can see the mass of the letter is equal to one, two, three, four grammes.

And that's because I have four grammes on one side of the scale and it's perfectly balanced with the letter.

So that must mean the mass of the letter is four grammes.

What is the mass of the pencil? So again, let's have a look.

One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve.

So I have 12 grammes on one side of the scale and it's perfectly balanced with the pencil.

That must mean the mass of the pencil is 12 grammes.

Now, what is the mass of the eraser? What do you think we should do? We should count how many grammes we have.

So count with me.

One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty grammes.

And these 20 grammes, it's perfectly balanced with the eraser.

That must mean the mass of the eraser is 20 grammes.

So here we have a scale and scales, often count grammes in steps of two, five or ten.

So to read this scale, it looks like we will have to count in steps of one.

So we start at zero and we go count with me.

One, two, three, four, five, six, seven, eight, nine excellent.

So to read this new scale, can we count in ones it goes from zero to two.

So that probably means we have to count in steps of two.

So count with me.

Zero, two, four, six, eight, ten, twelve, fourteen, sixteen, eighteen.

Well done.

Now it's time for your talk task.

What I'd like for you to do is count out loud in steps of one or two to read the correct mass of the objects.

So you have to decide, do you have to read the scale in steps of one or two.

Then I want you to match the object to the correct mass.

So I'll do the first one is usual.

Okay.

Let's try counting in ones so we go one, two, three, four, five, six, seven, eight, nine, ten.

Okay, perfect.

I know I can count in ones here.

So 11, 12, 13, 14, 15.

So that arrow is pointing to 15.

So that must mean the apple has a mass of 15 grammes.

Now it's your turn.

Find the mass of each object by reading the scale, and then what I'd like for you to do is put them in order from lightest to heaviest, because you notice we're using the less than sign here.

So pause the video, see you when you're finished.

Super job everyone.

So we could see the mass of this parcel.

This parcel had a mass of 80 grammes.

This radio had a mass of 60 grammes, and this parcel had a mass of 28 grammes.

So the lightest item had a mass of 15 grammes.

15 grammes is less than 28 grammes, which is less than 60 grammes, which is less than 80 grammes.

So let's keep reading scales.

Can you identify what each marker represents? Can we count in ones? No, it's going from zero to five.

So what should we count in? That's right fives.

So count me zero five, ten, fifteen, twenty, twenty five, thirty, thirty five, forty, forty five.

Great job.

Let's try another one.

Okay.

So this is a bit trickier.

So I know that when I get to this marker, this is a marker of 50, let's see.

Can I count by ones one, two, three, four, five.

No, that would only get me to five.

And you see It's a 50.

Okay I can try my fives.

Five, ten, fifteen, twenty, twenty five.

No, that still doesn't get me to fifty.

I've counted by ones, counted by fives.

Maybe I can try counting in tens.

Zero, 10, 20, 30, 40, 50 super let's keep going.

60, 70, 80, 90 100, 110, 120, 130, 140, 150, 160 170, 180 190 and we're back.

Wow that was a really good job.

Okay.

So now I have these two scales here and I have some objects on each scale.

I want to compare the mass of each item.

But before I do that first, I must actually determine the massive each item.

So let's have a look at these scales together.

The cookie jar let's see, I know I'm counting in tens.

So here, I'm going from 80 to 90.

What's perfectly in the middle.

What's in between 80 and 90.

Okay this must be pointing to 85 because 85 is perfect in the middle it's in between 80 and 90.

So the cookie jar has a mass of 85 grammes.

Let's have a look at the football.

So it looks like we've gotten to 100 and then 120.

So this is pointing at exactly 120.

So the mass of the football is 120 grammes.

So I want to use my less than or greater than symbol.

85 is it less than or greater than 120? I know 85 is less 85 grammes is less than 120 grammes.

So I'm going to use less sign symbol.

Let's try this again.

I know that the football weighs 190 grammes because when I look at this scale, I know I'm counting in tens because I go 100, 110, 120, 130, 140, 150, 160, 170, 180, 190.

So the football weighs 190 grammes and the book let's determine that mass.

So what am I counting in here? 10 20, 30, 40, 50.

So I'm counting in tens again.

So if this is 150 and 10 more is equal to 160.

So that must mean the book weighs 160 grammes.

So 190, is it less than or greater than 160? That's right.

I know that 190 is greater than 160 grammes.

So I use the greater than symbol.

Remember when we use the less than or greater than symbols, I can always tell the difference because the opening always wants to open towards the greater number, the number with greater value.

Now it's already time for your independent task.

What I'd like for you to do is to record the weight of each parcel using grammes.

So you have to look at each scale and you have to figure out okay, what is the mass of each item? So as usual, I'll do the first one before you go off on your own.

So it looks like here, it's going from zero to fifty.

So I can count.

I think I can count in tens.

10, 20, 30, 40, 50 yup, this is in tens.

So if this is 150, what's the next 10? Oh, that's right.

160.

The arrow is pointing at 160.

So I fill that in.

Now your turn, you're going to identify the weight of each object, and then I want you to put them in order from heaviest to lightest.

So you would write the heaviest item here in grammes, just write the grammes and then the lightest grammes at the end.

So you're going from heaviest to lightest.

Pause the video resume when you're ready.

Good luck.

Super job, everyone.

So the grapes had a mass of 40 grammes.

The watermelon had a mass of 60 grammes and the parcel had a mass of 15 grammes.

And when we order this from heaviest to lightest, we said 160 grammes was greater than 60 grammes, which was greater than 40 grammes, which was greater than 15 grammes.

Really, really good work everyone.

If you'd like to, you can ask your parents or carer to share your work on Instagram, Facebook or Twitter, tagging @OakNational and #LearnwithOak.

As always, don't forget to complete your final quiz, and I really hope to see you for future lessons.

Bye.