# Lesson video

In progress...

Hi friends it's Miss Molnar here, and I'm going to do some math learning with you today.

In this lesson we're going to be looking at subtraction by partitioning.

And let's see what items you're going to need for this lesson.

For today's lesson you're going to need some objects to count with.

I've got some cubes, but you could ask a parent or care for help in finding some different objects you've got at home.

You're also going to need a part whole model.

You can find this attached in the resources but you could also get a parent or care to help you make one.

I can show you how I've made one to use today.

You'll also need something to write with.

Okay pause the video now, go get all of the items you need and we'll get started on this lesson.

Okay let's get started by playing a little bit of a warm up game.

You're going to need your invisible magic math pencil You're going to write a number in the air.

I'm going to call it out and I want you to draw what it looks like in the air.

Okay, are we ready everyone? All right, can you write in the air the number 2? Well done let's do it together.

So I'm going to go around and down and over.

Number 2.

Let's try another one.

Hm.

How about the number 1? We'll start at the top and go down.

Well done.

All right I've got a little bit of a challenge for you.

I'm going to write a number in the air and I want to see if you can guess which number it is.

Are you ready? So I'm going to start at the top and I'm going to go down and around and I'm going to join it back and join it back at the top.

Hm I wonder if you can guess what number I'm thinking about So I started at the top I went around and down all the way back up and joined at the top.

If you said zero, well done! You're so right it's zero.

All right for this next counting game I definitely need a friend to help me with this so I've made sure that Harold the hedgehog could be here to help me.

Say hello to everyone Harold! Well if you haven't met Harold before he loves counting games and he loves doing math learning So I couldn't help but get him involved.

All right Harold, should we play a little bit of ping pong All right so we're going to count to 10 together with you at home but we're going to play a little ping pong.

So what that means is we're going to say a number and then we're going to ping pong to you to say the next number.

So we're going to go back and forth saying all the numbers.

Beginning on zero all the way to 10.

All right are we ready everyone? All right we're going to start first.

Zero.

One.

Good.

Two.

Four.

Six.

Eight.

Ten.

Well done everyone.

All right shall we try to do it backwards this time? We don't you start us off by saying 10 and we'll count backwards back and forth.

Okay.

Are we ready? You start off by saying 10.

Here we go.

Nine.

Seven.

Five.

Three.

One.

And Zero fantastic effort everyone.

Well done at doing counting ping pong.

Harold's friends are off to the park today.

How many friends does Harold have going to the park? Count them now.

That's right there's 6.

Or we could say that 6 is the whole.

I say you say.

6 is the whole.

Well done.

Now 2 of Harold's friends get a sweet tooth.

They're off to get some ice cream.

So we could say that 2 is a part because 2 friends have ice cream.

I want to know what the other part is.

How many friends do not have ice cream? Count them now.

That's right 4 friends do not have ice cream.

So we could also say that 4 is the other part.

So let's say it together what we have for our parts.

2 is a part and 4 is a part.

Well done.

What was our whole again? That's right our whole amount of friends was 6.

2 of them have ice cream, 4 of them do not.

We could also say that 6 subtract 2 is equal to 4.

Say that now.

6 subtract 2 is equal to 4.

Great job everyone.

There's some of Harold's friends ready to take some photos at the park.

How many is the whole this time? That's right 4 is our whole this time because there are 4 friends ready to take some photos.

All right how many friends have yellow cameras.

That's right 3.

3 of Harold's friends have yellow cameras.

So we could say that 3 is a part.

Great job.

All right so if 3 of Harold's friends have yellow cameras how many friends do not have yellow cameras.

That's right.

There's only 1 friend who doesn't have a yellow camera.

We could say that 1 is our other part.

So 3 is a part and 1 is a part.

What was our whole number again? Our whole amount? That's right, 4 is out whole amount.

Because there's 4 friend in total.

3 friends have yellow cameras.

1 friend does not.

We could also say that 4 subtract 3 is equal to 1.

Can you say that out loud with us? Ready ? 4 subtract 3 is equal to 1.

Okay so we're going to use some objects to represent Harold's friends with a part whole model.

Now you could find this in the worksheet resources.

But you might not have a printer at home and that's okay.

Cause you could get a parent or carer to help you make your own part whole model.

And I'm going to show you how you can make one just like mine Okay so what I did was I just took a piece of card but you could use any paper or even if you have if you ask a parent or carer for some spare cardboard that's around.

You could make one on that as well.

So I got my piece of card and I just got a glass From my kitchen and again make sure you ask a parent or carer before you do any of this and what I did was I took a pencil first and I traced around to make a circular shape for my whole and then I re went around it with pen.

And I did that in 3 spots.

So I can have room for my 2 parts and my whole.

And then I just drew 2 arrows to show that I start with my whole and then I'm going to move into my parts All right so thinking back to my problem with Harold's 4 friends.

So these are Harold's friends with our green cameras.

And this is Harold's friend with the yellow camera.

So remember we said our whole was 4 because there were 4 of Harold's friends.

Now we said that 1 of the parts was the friends with the green cameras.

So we had 1, 2, 3 friends.

That is 1 of our parts.

3 is a part.

Then we had 1 friend with the yellow camera.

1 was our other part.

So we had 4 subtract 3 is equal to 1.

All right we would like you to have a go at making up your own math story.

So what you're going to do is you're going to pause the video.

You're going to choose a number from 1 to 6.

And represent that in your whole using some counting objects.

Then you need to decide in your story kind of like Miss Molnar's story with Harold's friends and the cameras.

You're going to decide what some of them are going to be doing and move the objects to 1 part.

Then we need to say how many the other part is.

Have a go at using some of the sentence stems on the screen.

Pause the video grab what you need and we'll come back together.

All right I hope you made up a great math story using your own part whole model as well.

Now what I'm going to do is I'm going to tell you a different math story.

So I've got, I chose for my number cards.

I wanted to represent the number 5 as my whole.

So I've got 5 bears in my whole.

My teddy bears in my story are playing outside.

2 of them are going to go play in the sand pit.

So I could say that 2 is a part.

5 was my whole and 3 is a part.

Because 2 of the teddy bears are going to play in the sand pit.

What is my other part going to be? How many bears are not playing in the sand pit? That's right there are 3 bears who are not playing in the sand pit.

And 2 bears are playing in the sand pit.

So that means that 2 is a part and 3 is a part.

5 was my whole.

And then I moved 3 to not being in the sand pit and 2 in the sand pit to be my parts.

Now I wonder what would happen if this bear over here you know what he decided that actually he wants to play in the sand pit.

How many friends are playing in the sand pit now? That's right! 3 of my friends are playing in the sand pit and 2 of my friends are not in the sand pit.

Has this changed the whole? Let's double check.

Let's go back So I've got 1, 2, 3, 4, 5.

It's not changed the whole I still have 5 bears, 5 friends.

But I had 3 friends instead who were playing in the sandpit What if 4 friends wanted to play in the sandpit? Has my whole changed? What is the other part? How many friends are not playing in the sand pit? That's right.

1 friend is not playing in the sand pit.

My parts have changed.

I've got 4 as a part.

And 1 as a part.

But my whole is still 5.

I still have 1, 2, 3, 4 , 5 bears.

So what we want you to do is go back to those numbers from 1 to 6.

Which number did you choose for your story last time? Can you choose the same number as your whole? Go back and retell your story.

But this time change the parts.

Remember how some of the bears ended up changing their minds and going to the sand pit.

Could you change some of your parts around but keep the whole the same.

What happens to your parts when you move them? Can you use the sentence stems again? And tell my what the parts are now? And what the whole is? Pause the video have a go at that, and we'll come back together when you're ready.

All right everyone I bet you came up with a great subtraction story to explain your whole number and what happened to the parts when you moved them around Well, we are all out of time today I'm afraid.

But I hope you've enjoyed that lesson.

And if you'd like to I really hope you can take a photo of your learning and share it with your teacher So they can see the amazing learning you've done.

And if you'd like to you can ask your parent or carer to share your learning with oak on our social media as well Okay I hope you have a great time with your other learning Take care everyone!.