Lesson video

Hello everyone, and welcome to maths with Ms. Dobrowolski.

Today, we'll be learning about halves and quarters.

Let's have a look at today's lesson agenda.

So first up, it looks like we will be comparing containers, then we'll be looking at halves, then quarters, and finally you'll be off, for your independent task.

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

If you do not have these items, pause the video now and go get them.

Super, so, here we have my friend Mary, and Mary says, "these all contain the same volume." What do you think? Do all of these contain the same volume? Do you agree or disagree? Pause the video and have a think, resume when you're ready with an answer.

Super, so what did you think? Because I said, they can not all contain the same volume.

I disagreed, and that's because all three of these containers are different sizes.

So, you can't really say, that they're all holding the same volume.

Which one do you think is holding the greatest volume? Hmm, because I think, the container in the middle, is holding the greatest volume and that's because, even though all three of these containers, have the same height, the container in the middle, is a bit wider.

Which container do you think is holding the smallest volume? Convince me, pause the video, and think of a way to convince me, which container is holding the smallest amount of volume.

Super, so, what did you think of, what did you say? Because I said, that the container over here is holding the smallest amount of volume, because it is not as wide as the other containers.

So perhaps it is holding the smallest amount of volume.

Super, so, I have two containers here, a small container and a big container.

If I pour water from the smaller container, into the larger container, where do you think think the water will come up to and why? Will it come up to the first line, the second line, the third line or the top? What do you think? Should we try? So, when I poured the smaller container into the larger container, it came up, about, half way.

So the water from the smaller container reaches halfway up the larger container.

So that means, the smaller container, has half the capacity of the larger container.

The large container has double the capacity of the smaller container.

So, my turn, your turn.

The smaller container has half the capacity of the large container.

Good, again, my turn, your turn.

The large container, has double the capacity of the small container.

Good job, okay.

Now, what will happen if I pour the smaller container into the already half full large container? So this container is already half full, if I add this container into the large container, where will the water come up to? Where do you think? One, two, three, or the top? Hmm, let's see.

Wow, so it looks like the smaller container has half the capacity of the larger container, right? So I have now poured two equal small containers into the large container and it is now full.

So these two halves make one whole.

So the two equal small containers, have filled the large container.

That's because two halves are equal to one whole.

Okay, now I have some other containers.

Which of these containers, do you think, has approximately, meaning just about, has approximately half the capacity, of container A? This is container A, which of these containers has approximately half the capacity of the container A? What do you think? Tell your screen.

Good, it is container E.

So container E, is about half the capacity, of container A, and that's because it's about half the size.

So C and G are quite small, and B and D are quite big.

But E, is half the size, so it has half the capacity of container A.

Okay, what about these containers? If I pour water from the smaller container, into the bigger container, where will the water come up to? Hmm, where do you think? Line one, line two, line three or the top? Tell your screen.

Well, the larger container is split into four equal parts.

One, two, three, four.

And these four equal parts are called quarters.

I have filled one quarter of the container.

What if I filled the larger container with another quarter? How much of the large container will I have filled? See, I already filled it with one quarter, now I want to add another quarter.

So where will the water come up to? One, two, three or the top? That's right, I have now filled two quarters, which is equal to, one half.

I have filled one half, of the large container and it's already time for your independent task.

So, what I would like for you to do is to complete the sentences.

So let's have a look at number one together.

So the capacity of cup A is, Hmm.

So let's look at cup A.

So it looks like cup A, can fill one quarter of the container.

Remember these are split into quarters.

One, two, three, four quarters.

So the capacity of cup A is one quarter, the capacity of the large container.

Your turn, it's time for you to fill in the blanks, and use these top pictures to help you.

Pause the video, when you're ready resume, and we can go over the answers together, good luck.

Super job everyone.

So, number two, I would need three cups into this container to fill it.

So again, cup A is equal to one quarter.

So if we wanted to fill one, two, three quarters of the container, we would need three of cup A, to fill it, so three cups.

The capacity of cup B is, let's see.

Cup B, okay so if I pour cup B into the large container, it's about one half, it comes up halfway.

So the capacity of cup B is one half the capacity of the large container.

For number four, our friend filled up cup A, and poured it into cup B twice.

What did cup B look like and why? So remember, cup A is equal to one quarter.

And if we filled cup A and poured it into cup B twice, that means we have filled half way.

Cup A is one quarter and cup B is one half.

Two quarters are equal to one half, which means we would have filled cup B.

Here we have the girl fills an empty container with cup A and cup B, how many of each cup did she pour? Well I know cup A is equal to one quarter and cup B is equal to a half.

So if she filled an empty container with cup A and cup B, that means she must've poured, one of cup B that would make one half, and then two of cup A, because we would have a half, plus one quarter, plus one quarter, which would make the empty container, full.

Great job everyone.

If you'd like to, you can ask your parent 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.