Lesson video

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Hi, friends, it's Miss Molnar here and Harold, the hedgehog.

And today we are going to do some super fun math learning.

We're going to be trying to find one less than a number within 10.

All right, Harold, shall we see what we're going to need for this lesson today? All right, Harold, so let's see what we're going to need for this lesson today.

You're going to need some objects to count with.

So I'm going to use cubes, but you might ask a parent or carer if you could use some Lego pieces or some blocks or perhaps some dry pasta.

You're also going to need a 10 frame.

Now you can find one in the downloadable resources, but you can also just make one at home with a parent or carer.

You could draw one on a piece of paper.

And then, finally, you're going to need some number cards from one to 10.

You can also find these in the downloadable resources or you can write the numbers one to 10 down on a piece of paper.

All right, pause the video to get what you need and then we can get started.

All right, now to get started thinking about one less, or one fewer, we're going to start with our five fingers.

Okay, can you show me your five fingers at home? Great! So I've got five fingers.

If I want to show one fewer that means I need to put one finger down to have one fewer or one less.

So I had five first.

If I put one finger down, if I put my thumb down, how many fingers do I have now? That's right.

There's four fingers.

Okay, so you can show me the same.

So you can start with five.

We show one fewer than five and that would be four.

All right, let's try another one.

So this time, can you show me with your hands the number three? Way to go.

Well done.

Now, can you show me one fewer than three? That means you've got to put one finger down.

Have a go at that and see if you can figure it out for us.

If you said two, well done.

One fewer than three is two.

All right, let's get on with the rest of our learning.

All right, so let's start off by looking at a counting picture.

What do you see in the photo? Take a minute to pause the video and tell us what you see.

That's right.

There's some flowers.

There's some frogs.

There's some fish and trees.

There's lots of different images, isn't there? How many trees are there? That's right.

There are six trees.


Hmm, I wonder how many frogs can we see? How many speckled frogs? Let's count them.

One, two, three, four, five.

Well done.


Wow! There are certainly a lot of fish in the pond.

Do you see that, those pink fish? Shall we count how many there are? Hmm, could you pause the video and count how many pink fish there are? Well done.

If you said 10, wow-wee.

That was a big number to count to.

You're right.

There are 10 fish in the pond.

Let's work with this number 10.

So, if I'm going to show 10 on my 10 frame, I need to count out one, two, three, four, five, six, seven, eight, nine 10.

Well done for helping me count, everyone.

Now I did count out every object until I got to 10, but there's something special about my 10 frame.

What do you notice about my 10 frame and the cubes? Are there any spaces missing? No, that's right, the timeframe is full up and that's because there are 10.

A 10 frame is called 10 frame because it has 10 spaces.

So we know that in order to make 10, we have to fill up the whole 10 frame.

So I can do that quickly next time, can't I? All right, so we're starting with 10.

And now I want you to watch what I do next.

Ooh, what's happened to my 10 frame? That's right.

There's one cube missing.

So do I still have 10 on my 10 frame? No, we do not have 10 anymore.

You're right.

I've got one less, or one fewer, than 10.

Hmm, I wonder, how can I find out what this number is? I could count them.

I could count one, two, three.

I could keep counting on.

Or I can think about what I know about number 10 and counting back.

I need to think about what is one less than 10.

one less than 10 is nine.


So there I go.

I've got my number nine.

Now I could have counted them out, all the way up to nine, but I can use my 10 frame to help me recognise the number nine.

Okay, so when my 10 frame is full, I know that's 10.

When there's one cube missing, or there's one space free in my 10 frame, I know that's going to be nine, because 10 is one more than nine or nine is one less than 10.

All right, first thing, let's look at a number line to see how this might work.

Can you point to, on my number line, the number 10? Way to go.

You found it.

Well done.

There's my number 10.

And I want to show one less or one fewer, so I'm going to do a jump back on my number line one space.

One space back, or one less, would be nine.

So then I could say one less than 10 is nine.

Can we say that together, everyone? Ready? One less than 10 is nine.


All right.

Let's have a go at another number this time.

So I'm going to pick a number card from my number cards, and I've got the number three.

All right, so with my number three, I need to represent that on my 10 frame.

So I've got three cubes on my 10 frame.

Let's double-check, Harold, okay? Ready? One, two, three.

Thumbs up if I've got three.


All right.

Now remember, I want to find one less than three.

So I'm going to find three on my number line.

Can you point to the number three on my number line? Well done.

There's number three.

Add to find one less, we need to count back one jump back.

So I'm going to take off one cube off my 10 frame and I can see that I've got two left.

But then on my number line, I'm going to do one jump back.

And that gives me two.

So that means that one less than three is two.

Let's say that altogether.

Everyone ready? One less than three is two.

Okay, so now we want you to have a go with your Talk Task at the same activity.

So you're going to need your 10 frame, your counting objects, and you're going to need a number line and some number cards.

Now, again, you can use the number line on the screen.

You can pause the video and use it on the screen.

You can also use the number cards on the screen if you can't print them.

Then, using your 10 frame, whether it's drawn or printed, you're going to pick a number.

You're going to build it on your 10 frame.

Okay? Then, you need to take one away to find out what is one less or one fewer.

Once you've done that then you can find your number line and you can count one jump back from the number to find one less.

Then you can say one less than hm is hm.

All right, pause the video.

Have a go at a few different numbers and then we'll come back together.

All right, so what I've done is I went and got my cubes for my counting objects.

And I have started to make my number blocks from one to five.

You're going to want to make them all the way up to number 10.

So you might have some Lego blocks at home.

Lego bricks that you could actually do this with to make your number blocks.

You also might just use some dry pasta and you might just line them up on the table.

Or if you'd like to, you can actually draw the number blocks out and then get a parent or carer to help you cut them out to use them for the lesson.

So you'll want to make them all the way up to number 10.

I've just gone to five.

So once I've done that, I'm going to draw a number card.

So I'm going to take one number card.

I've got the number three.

Okay? And what I'm going to do is I want to find one less than three.

Okay, so I'm going to find number three first, my number block.

I've got my number three.

And what I'm going to do is I'm going to take one away or show one less.

So I've taken one away.

Now, what number does it look like? Yeah, that's right.

It's now a number two.

When I compare it next to the one next to me, it is number two.

So what that means is one less then three is two.

So you're going to have a go at that, picking a number card and using your number blocks to help you compare to find one less than a number.

All right, so now that we've made our number of blocks from one to 10, you can have a go for your Main Task at finding one less, by any number one to 10, by using your number blocks to compare.

Okay, so the first thing I'm going to do is I'm going to pick a number card.

So if I picked number six, then I'm going to get number six, and I'm going to use my number of blocks number line, and I'm going to compare what would be one less.

So what I might do is I might take one block off from my number six and I might compare it with my number six, and I might compare it with my number next to it and see what number I've got left.

And then I can say one less than six is five.

Okay, so have a go using your number blocks to help you figure out one less than, and then we'll come back together.

All right, how'd it go, everyone, finding one less? Did your number of blocks help you? Oh, I'm sure they did.

All right, well, Harold and I thought we'd give you a little bit of a quiz on finding one less before you go.

So Harold's going to pick a number.

Okay, and you can use your number blocks to help you if you can't remember.

All right, you ready? What is one less than five? If you said four, well done.

You are right.

One less than five is four.

All right, let's have another go.

Okay, one less than eight.

If you said one less than eight is seven, fantastic.

Well done, everyone.

Well, we hope you've had a great time with your learning today.

And hopefully you've taken some photos of your learning.

I'm sure your teacher would love to see what you've been up to today.

And, well, we would be so excited, if you'd like to, you could a parent or carer to share your learning with us, here at Oak, on our social media.

All right, well, that's all we have time for for today, but we really hope you enjoyed that.

And we'll surely see you next time.

Bye, everyone.