Lesson video

To find half of a quantity.

Hello everybody, it's Miss Sidhu here to do some wonderful maths with you.

In this lesson, we will be finding one half of a quantity by splitting the whole into two equal parts.

Welcome to today's lesson.

You will need a paper and a pencil.

There are times when you would have to pause the video and have a go at some of the activities yourself.

Now, let's get started.

Here we are going to look at our key vocabulary, that means our star words.

Identifying equal and unequal quantities.

Using a part-whole model to find half.

An independent task and answers, and finally a quiz to see what we have learned.

Now, let's get ready for our star words.

Star words, star words.

My turn first, then your turn.

Part.

Whole.

Equal.

Unequal.

Half.

Share.

Divide.

All through the lesson we will be using our star words.

But first, I've got a brainteaser to warm up your brain.

Now let's start with the brain teaser to get us all warmed up.

Today, you need to select a number and then find half.

I want you to pause the video and have a go.

So I want you to pause, have a think, and then write the answer down.

How did you get on? Were you able to find half of all of the numbers? Now, mm, which one shall we start with first? Let's start with half of 10.

Half of 10 is five.

Let's do the next one.

Half of six is three.

Half of, let's see which one shall we do next? I think we'll do 14.

Half of 14 is seven.

I hope you're doing well at home as well.

Or you might be at school.

Half of 20 is 10.

Super duper! And the last one.

Half of 16 is eight.

How did you do? Give yourselves a round of applause if you got them all correct.

Here we have a big picture with Anansi, the spider, and Turtle.

Anansi and Turtle are having a dinner party.

We need to make sure that they are being fair and that they have an equal share of food.

Hmm, what does that mean? How can we show that something is equal? Have a think.

Can you tell me what you think equal might mean? Say it nice and loud so that I can hear you.

Oh, lots of different ideas.

Let's see if we can find out what equal means and see if you've got it correct.

So here we have some carrots and we're going to find out if they have an equal share of carrots.

So we've got Anansi and Turtle.

Do they have an equal share of carrots? Anansi has, one, two, three, four, five carrots.

And Turtle has one, two, three carrots.

Do they have an equal share of carrots? Show me with your thumbs up or thumbs down.

I could see lots of you with their thumbs down.

They are unequal.

We know that they are unequal because Anansi has two more carrots than Turtle.

Five is two more than three.

Here we have Anansi, and she has one, two, three, four, five cupcakes.

Anansi has five cupcakes and Turtle has, one, two, three, four, five.

Turtle has five cupcakes.

Do they have an equal share of cupcakes? Have a think.

No, it showed the thumbs up if they are equal, or thumbs down if they're unequal.

After three, show me your thumbs.

One, two, three.

Ah! Super they are equal.

We know that they are equal because Anansi and Turtle both have the same.

Anansi has five cupcakes and Turtle has five cupcakes.

Same, same, matchy-matchy.

Here we have some sandwiches, mm, they look tasty.

Anansi has, one, two, three, four sandwiches.

Anansi has four sandwiches.

How many sandwiches does Turtle have? Do you think you can count it super quick? Let's count it together.

Turtle has one, two, three, four, five, six.

Turtle has six sandwiches.

Do they have an equal share of sandwiches? Show me if you think it's equal or unequal.

Have a think.

Yeah, they are unequal.

We know that they are unequal because Anansi has two less sandwiches than Turtle.

Four is two less than six.

So four is two less than six.

Now, let's have a look if they shared the bananas fairly.

Anansi has, one, two, three, four bananas, and Turtle has one, two bananas.

So Turtle has two bananas.

Do you think they have an equal share of bananas? Show if true or false or equal, unequal? Have a think.

Lots of you are showing me their your thumbs down.

Super! They're unequal.

We know they are unequal because Anansi has two more bananas than Turtle.

Four is two more than two.

Let's see if we can have a look at the part-whole model to show that we can share equally.

Oh, this time we've got some lovely, juicy, orange carrots.

Have the carrots being shared equally.

Anansi has one, two, three, four, five carrots.

And Turtle has one, two, three carrots.

We know they are unequal because Anansi has two more carrots than Turtle.

But, we need to share them equally.

Hmm, let's see if we've got any answers.

The whole is how many carrots do Turtle and Anansi have altogether.

Therefore eight is our whole.

Let's grab the carrots, and let's put them in the whole.

We can divide the whole into two equal parts.

Anansi's part and Turtle's parts so we are sharing the whole in half.

We are sharing the whole into two equal parts to you find half.

The whole is eight.

To find half we need to share the whole into two equal parts.

We can use the "One For Me, One For You" strategy.

So one for Anansi, one for Turtle.

I want everybody doing it with me.

One for Anansi.

One for Turtle.

One for Anansi.

One for Turtle.

One for Anansi.

One for Turtle.

One for Anansi.

One for Turtle.

I know that half of eight is four because there are four carrots in each part.

One, two, three, four.

One, two, three, four.

Half of eight is four.

The two parts are equal.

Same, same, matchy-matchy.

We have shared the whole into two equal parts.

Four in one part.

Four in the other part.

Same, same, matchy-matchy.

I know that half of eight is four because there are four in each part.

The two parts are equal.

Have the cupcakes been shared equally? Anansi has five cupcakes, and Turtle has seven cupcakes.

Let's put the cupcakes into the whole.

So Anansi has five cupcakes and Turtle has seven cupcakes.

Now let's move them to the whole.

How can we make sure that they have half each? So the whole is 12.

How can we make sure that they have half each? We can divide the whole into two equal parts, Anansi's part and Turtle's part.

So we are sharing the whole in half.

Hmm, what strategy could we use? Can you remember? Can you shout it out for me.

That's right.

We can use the "One For Me, One For You" strategy.

So one for Anansi, one for Turtle.

So one for Anansi, one for Turtle.

One for Anansi, one for Turtle.

I want you to say it with me.

One for Anansi, one for Turtle.

One for Anansi, one for Turtle.

We've only got four more left.

One for Anansi, one for Turtle.

One for Anansi, one for Turtle.

Well, I could see that we have shared equally.

I know that half of 12 is six because there are six cupcakes in each part.

One, two, three, four, five, six.

One two, three, four, five, six.

The two parts are equal.

Here we have the numbers written in the part-whole model.

I knew that half of 12 is six because there were six cupcakes in each part.

The two parts are equal.

I think you're ready for your independent task today because you've been doing such great halving of numbers already.

For your independent task today, I want you to share the food evenly, in half for Anansi and Turtle.

You may want to use objects at home like pasta or counters and pretend it's the food.

You might want to draw it out like I've done here.

So there I've done a picture of Anansi and Turtle.

And you can share them equally to the two parts.

I hope you have lots of fun sharing the food.

You've got bananas.

You've got chocolate to share, and you've got the cupcakes to share.

I want you to pause the video and have a go at your independent task.

How did you get on with independent task today? Here are the answers.

Let's look at the bananas first.

Half of six is three.

Let's look at the chocolate next.

Half of 14 is seven.

And let's look at the delicious cupcakes.

Half of 18 is nine.

How did you do? You did such great work.

Let's give ourselves a big whoosh! Remember to share your work with Oak National.

I really want to see all of your work.

Please ask a parent or carer to share your work on Twitter tagging @OakNational and #LearnwithOak.

You could even write year one, so that I get to see your work too.

You were amazing today at making different amounts equal and finding half.

Super duper job.

Now, don't forget to complete your end of lesson quiz.

That's bye from Miss Sidhu.

Bye.