Lesson video

Hello, and welcome to this lesson, comparing numbers to 20.

So by the end of this lesson, we're going to be comparing groups using the language more than, less than, fewer than, and the same as.

So these are our key words for this lesson.

So we're gonna be saying more than, less than or fewer than, the same as, and equal to.

We'll go through them as we're going through the lesson.

So in the first part, we're gonna focus on one more than.

So here you've got a bead string or you might want to use a bead string in front of you.

So to find one more then a number, you start counting and you count forward one more.

So how many are on my bead string at the moment? Should we count together how many you can see on that one side? So there's one, two, three, four, five, six, seven, eight.

So the bead string is showing eight beads.

So now let's say one more than eight.

What is one more than eight? What is the next number after eight? Yes, one more than eight is nine.

Nine is the next number.

So there's our eight beads.

If we add one more across, we've now got nine.

Let's try another one.

How many is the bead string representing this time? Let's count together.

One, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13, 14.

So the bead string is showing us 14, which is the next number after 14.

What is one more than 14? One more than 14 is, yes, it's 15.

One more than 14 is 15.

Let's watch that one more, that bead move over.

Here we go.

So now we have 15 beads.

Now let's check how you're getting on.

To do this, you might want to use a bead string in front of you or you might be able to count on one more.

So the question is one more than 12 is.

You've got some options.

Is one more than 12 11? Is it 14, or is it 13? Have a little think.

So one, two, three.

The answer is.

Yes, one more than 12 is 13.

Well done.

Did you get that right? Because one more than 12 is 13.

14 is more than that.

11 comes before 12.

Let's try another one.

One more than 17 is.

So is it 18, 16, or 17? Have a little think.

One, two, three.

Yes, it's 18.

Well done.

One more than 17 is 18.

And the second one there, 16 is less than 17, and 17 is the same number, so it had to be that first one there, 18.

Last one.

One more than 19 is.

Have a little think.

Is it 19, is it 20, or is it 29? One more than 19 is 20.

Well done.

Did you get that right? Now to have another practise of one more than, you've got some cards here.

Your teacher will cut them up for you, or your adult, so you'll be able to choose one of these nine cards.

And what you're going to do is you're gonna turn over the card and count the objects on the card.

So in the one in front of us, we can see lots of pentagons.

How many pentagons can we see? Should we count them together? One, two, three, four, five, six, seven.

So you've got seven pentagons on the card.

So in hoop one on the side, you're gonna put seven counters in there, so you're gonna put the same number of counters into the hoop.

Now in the hoop on the other side, I want you to put in one more.

So one more than seven would be, yes, it will be eight.

So we've got seven objects on the card and seven counters in hoop one, and then one more than seven is eight, so there are eight counters in hoop two.

Your teacher will carry on and explain the activity to you further.

So now pause the video so you can have a chance to play the game.

So how did you get on? Were you able to work out what one more than each of the objects was on your card? Did you have to start counting back at one number, or did you just say the next number? You'll be better even quicker at this the more we play these kind of games.

Now we finished the first part of our lesson one more than, and we're gonna move on to the second part of our lesson.

This is where we say one less than or one fewer than.

So to find one less than a number, we start counting and we count backwards one less.

To find one fewer than a number, we start counting backwards and one find one fewer.

So we can see the word one less and one fewer, we use both times when we're counting.

So my question is, what is one less than nine? And you see there are nine beads on the bead string.

So what is the number before nine? What is one less than nine? So one less than nine is, yes, it's eight.

One fewer than nine is eight.

So you can say it in both ways.

What is one less than 12? One less than 12 is one number before 12, so the number before 12 is 11, so one less or one fewer than 12 is 11.

Now we're gonna have a little check.

So you're gonna think you're counting backwards this time.

So you're thinking what is the number before? What is one less than? What is one fewer than? So this time, we're thinking about 19.

So what number is one less than 19? Have a little think.

So is it 20? Is it 18? Is it eight? One, two, three.

Yes, one less than 19 is 18 because 18 comes before 19.

See that first one? The first answer's 20.

That's one more than 19.

Let's try another one.

Now then, what is one less than 18? Which number comes before 18? One, two, three.

One less than 18 is, yes, it's 17.

Well done.

Did you get that right? Now then, what is one less than 15? Is it five, is it 13, or is it 14? Have a little think.

One, two, three.

One less than 15 is, yes, it's 14.

14 comes before 15, which is one less than 15.

Well done.

Now we're going to play the same game we played in the first part of the lesson.

So get the cards out and ready, but this time, we're gonna be thinking about one less than or one fewer than.

So if you turn over a card, you can see I picked out the aeroplanes this time.

How many aeroplanes are there? Should we count them together? One, two, three, four, five, six, seven, eight, nine, 10, 11, 12, 13.

There are 13 planes on that card.

So in that hoop you need to put 13 objects or 13 counters into the hoop.

Then we need to think, what is one less than 13? What number comes before 13? So one less than 13 is? Well, yes, one less than 13 is 12, so we need to put 12 counters in hoop two.

Okay, if you'd like to play the game now, pause the video so you can have a go playing the game.

So how did you get on playing the game? Were you able to find one less than, one fewer than each of the cards? So if we look at the card here with those pentagons, now there are seven pentagons, so we've got seven counts in hoop one.

So one fewer than seven is, yes, it's six.

So we could say six is one fewer than seven or six is less, is one less than seven? We can say in both ways.

Well done.

Now we've finished the second part of our lesson.

So now we've just got the final part to go, and this time we're thinking of the same as or equal to.

When there is a different number of objects in both boxes, we say they're not the same number.

So if you look at the screen now, there are two cubes in one of the boxes and one cube in the other box.

So two cubes on this side and one cube on this side.

When there is a different number of objects, they are not equal in number.

So you've got two cubes on this side and one cube on that side, so they're not the same.

They're not equal.

Now let's have a look.

What do you notice this time? Yes, you can see there are two cubes on one side and there are two cubes on the other side.

So when there is the same number of objects in both sets, we say they are the same number.

So there are two cubes in this box.

The cubes in this box is the same number.

Another way we can say it is if there are two cubes in the one box and two yellowy orange cubes in the other box, we'd say they're equal in number.

So there are two cubes in this box.

The cubes in both boxes are equal in number.

So we've got two ways to say it.

We can say they have the same number, and they are equal in number.

Now you get to have a go.

Let's check if you can get those words.

Are you ready? So if there are eight cubes in this box, how many cubes do there need to be in the other box to be equal? Have a little think.

There are eight cubes in this box, so how many cubes do there need to be in the other box? So one, two, three and you can show me on your fingers.

So one, two, three.

Yes, there'd need to be eight.

Well done.

Eight is equal to eight, and eight is the same as eight.

Let's try another one.

Now then, we've got lots of pictures, just like we had earlier on, but these ones, I want you to count up how many objects are in each of the pictures.

You're going to see if you can find sets that have the same number of objects.

Should we start together? So how many fish can you see in the first box? Should we count them together? Let's go.

So one, two, three, four, five, six, there are seven fish.

So now we need to find another card with a seven on it.

Should we try with the carrots? How many carrots do we think there are? Let's count.

So there's one, two, three, four, five, six, seven, eight, nine, so nine is not the same number as seven, so that's not the same.

Should we try the one with the cups? How many cups are there? Should we count together? One, two, three, four, five, six, seven, eight, nine.

There are nine cups.

So nine is the same, same number of cups as there are carrots, so we say I've got the same number of objects.

Now pause the video so you can have a go and count all of them and see if you can work out which ones are the same and which ones are equal.

So how did you get on? Did you manage to find a matching pair that had the same number of objects? Yes, that's right.

The fish and the balloons, because we counted up and we know there were seven fish, so that must mean there must be seven balloons.

Should we test it out? One, two, three, four, five, six, seven.

Yes, there are seven balloons.

Did you find another pair? Yes, that's right.

The carrots and the cups.

We counted them before, didn't we? There were eight carrots, which is the same number as eight cups.

So there's eight and eight, is equal.

It's the same number.

So that must mean that there's the same number of keys as there are eggs.

How many keys are there? Let's count them together.

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

Yes, there are eight keys.

That must mean there are eight eggs, too.

Let's see.

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

Yes, there are eight eggs, too.

Well done.

Now we've got three sets of balloons, and the question is, which sets have an equal number of bunches of balloons? So we'll need to count them to see.

So if we look at the one on the left, if you point to that, you can see there's one, two, three, four bunches of balloons.

How many are in the middle one? Yes, there's three bunches of balloons.

And how many are on the other one? One, two, three, there's four bunches of balloons.

So which sets have an equal number of bunches of balloons? Do you want to point to them? Yes, ones on either side.

There are four bunches of balloons on the left and four bunches of balloons on the right.

They have an equal number of bunches of balloons.

They have the same number of bunches of balloons.

Now let's have a different question.

Can you point to two sets that do not have the same number of of balloons? Which two sets could you pick? Yes, you could pick the two on the left, so you've got the left and one in the middle.

Could you pick another pair? Yes, you could.

You could pick the one in the middle and the one on the right.

Well done.

Did you get that right? Now we're going to move on to making some models using some bricks.

So Lucas has been making a model.

How many bricks are in his model? I've made his model, too, so your teacher or your adult or you can have a go at making that model, and you can count on how many bricks you've made.

So my model has one, two, three, four, five, six, seven.

We've got seven bricks in my model, and it says there are seven bricks in this model.

Now, Jun, Jun has also made a model using some bricks.

And here's Jun's model.

You see it? So how many bricks are in Jun's model? Let's count together.

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

There are seven bricks in Jun's model.

So Lucas and Jun, Lucas and Jun have the same number of bricks in their models because Lucas has seven bricks and Jun has seven bricks.

They are the same number.

They are equal number of bricks.

Now here's a chance for you to practise.

It says Laura has made a model with some bricks, and here is of the model I've made.

I've copied the model that Laura made.

It says, can you make different models using an equal number of bricks? So let's start off, let's count together how many bricks has Laura used? One, two, three, four, five, six, seven, eight, nine.

So you need to make a model that's got nine bricks.

And then when you've done that, you and your partner can choose your own number of bricks and see if you can make different models, but they've both got to have the same number of bricks.

So pause the video now.

I'll give you a chance to have a go.

So have you made lots of models? You can see there's an example on the screen here that has an equal number of bricks, and I had to go, too.

Here's the model that I've made.

Should we count up and make sure that I have the same number as bricks as Laura? Remember, it needed to be nine bricks.

Let's see.

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

So my model does have the same number of bricks, has an equal number, because nine is equal to nine.

You can share some of the different models that you've made.

Now for the second part, you and your partner were choosing your own number of bricks.

What numbers did you choose? Were you able to make models that had the same number of bricks? Well done.

So during our lesson today, we've been comparing different numbers to 20.

We've been using the number more than, less than, fewer than, the same as, and equal to.

So lots of different phrases that we can use to compare those different sets.

It's really important to make sure that we notice the number of cubes in the model, not the size, because we've just up those different objects.

Well done.

You've worked really hard today.

It's been fun making different models.

I'll see you soon.

Bye!.