Lesson video

Hello everyone.

Welcome back to another maths lesson with me, Mrs. Potchel.

As always, I can't wait to learn lots of new things and hopefully have lots of fun.

So let's get started.

This lesson is called calculate the difference when information is presented in a pictogram and it comes from the unit calculating within 20.

By the end of this lesson, you should be able to calculate the difference when information is presented in a pictogram.

Let's have a look at this lesson's key words.

Pictogram, difference, counting on and subtraction.

Let's practise them.

My turn, pictogram.

Your turn.

My turn, difference.

Your turn.

My turn, counting on.

Your turn.

My turn, subtraction.

Your turn.

Fantastic.

Now that we've practised our keywords, let's use them.

Here is today's lesson outline.

In the first part of our learning, we're going to be exploring pictograms, and in the second part of our learning, we're going to be interpreting information from a pictogram.

Let's get started with the first part of our learning, exploring pictograms. Laura and Andeep are back to help us with our learning.

Hi guys.

Are you ready to get started? Let's go.

Following their minibeast hunt, each class decides to create a pictogram to represent their findings.

Here's their pictogram here.

What can you see? Laura lets us know that each minibeast represents one.

Now this is the key.

This is a really important part of a pictogram because it lets us know how to read it.

So then Andeep, do you think you could use this information to interpret some information from our pictogram? Laura asks Andeep how many woodlice did they find? Andeep looks at the pictogram.

Oih, there's our woodlice.

Andeep can see that there are six woodlice.

So what does that mean, Andeep? That means that they must have found six woodlice.

You're correct, Andeep.

Well done.

Because remember, each of those minibeasts represents one.

Ooh, let's have a look at the snails.

They've not added them yet.

Do you think we can help them? Andeep lets us know that they found two snails.

So how are they going to show two on their pictogram? Hmm.

How are we gonna show two? We know that each minibeast represents one, so Andeep, do you think you can complete the snails? One snail, two snails.

Of course, we need two snails because now that shows that we found two snails.

Well done Andeep, and well done to you if you spotted this.

Laura lets us know that we can also compare numbers using a pictogram.

Andeep now wants to know what they found the most of.

Hmm.

Have a think.

Can you see from our pictogram what minibeast they found the most of? We can see that the ants represent the largest number, eight.

We can also see that this is the minibeast with the most pictures.

That must mean that they found the most ants in their garden.

Welcome Laura and Andeep.

So then, if we found the most ants, what did we find the least of? Hmm.

Have a look at the pictogram again.

The least.

Hmm.

I know that the least is the smallest number.

We can see that the snails represent the smallest number, which is two.

That means that they must have found the least number of snails.

Well done if you spotted that.

Laura now wants to know how many more ants than snails did they find? Hmm.

How are we gonna work that out? Andeep, any idea? That's easy.

Is it? We just have to find the difference.

Of course, we've been doing lots of practise of difference.

So on our pictogram we are going to focus in on our snails and our ants.

Come on then, Andeep.

Can you explain how you're going to find the difference? Andeep can see that they found eight ants and two snails.

So to find the difference, we can subtract eight ants and two snails.

The difference will be eight subtract two because that will give us the other parts and we know that difference is one of the parts that make the whole.

Andeep has remembered that consecutive even numbers have a difference of two.

So eight, subtract two will be equal to six.

So that means that the difference between snails and ants were six.

Well done Andeep and Laura, I love how you showed your working there with a bar model and an equation.

Laura notices a way that they could have used the pictogram to help them.

We could have used the pictogram to find the difference.

We can clearly see on our pictogram that there are six more ant pictures.

So that means that there are six more ants than snails.

A really good way of using the pictogram to help you there, Laura.

So how does the pictogram help us to see the difference then? We know that it helps to line objects up when we want to compare them, and a pictogram does that for us.

Wow, a really good spot there guys.

Well done.

So over to you then, let's practise this.

How many fewer snails than woodlice did class one find? I would like you to represent this as a bar model and show your equation to show your working.

You might then want to use the pictogram to check your working to check that you are correct.

Pause this video, have a go at finding how many fewer snails than woodlice there are and come back once you're ready to find out how you've got on.

Welcome back.

Let's have a look then, Laura.

How did you find how many fewer snails than woodlice there were? We knew that there were six woodlice and two snails.

So you can see that she started her bar model there.

To find the difference, Laura knew that she had to complete six subtract two.

Six subtract two is equal to four.

So Laura can now see that there are four fewer snails than woodlice.

Well done Laura.

Let's use our pictogram to help us.

Yes, look, there are four more woodlice than snails.

So that means we can also say that there are four fewer snails than woodlice.

Well done for completing that check.

Andeep now has a look at class two's pictogram.

There it is.

What can you see? Andeep thinks that he can see a pair of minibeasts that have a difference of zero.

Hmm.

Can you see a pair of mini beasts that have a difference of zero? Laura knows that if two numbers have a difference of zero, that means that they must be equal.

Which two minibeasts did they find an equal number of? Hmm.

Let's have a look at that pictogram.

We can see that there were two spiders and two snails.

They are equal.

So we know that the difference will be zero.

Look, two subtract two.

If you subtract a number from itself, we know that that is equal to zero.

So the difference between equal numbers is zero.

Well done Andeep.

Thanks for that question, Andeep.

That one really got me thinking.

So over to you then.

Do you think you could find two minibeasts that have a difference of one? Pause this video, explore that pictogram and come on back once you've found two minibeasts that have a difference of one.

Welcome back.

Laura, did you manage to find two minibeasts that have a difference of one? Laura knows that a difference of one will either be one more or one less on her pictogram.

We can see that there is one more butterfly than there are slugs, so they must have a difference of one.

Well done if you said that butterflies and slugs had a difference of one.

Right then, let's practise all of these skills that we've looked in the first part of our learning with task A.

Task A is to answer some questions left by class two about their minibeasts pictogram.

A, how many more butterflies than spiders did they find? B, how many fewer snails than ladybirds did they find? And C, which two minibeasts have a difference of four? Now look at C carefully because there may be more than one answer.

Pause this video, have a go at task A and come on back when you're ready to continue the lesson.

Welcome back.

I hope you enjoyed exploring class two's pictogram there.

Let's have a look at how we got on.

A, how many more butterflies than spiders did they find? We can see that they found six butterflies and two spiders.

Six subtract two will equal to the difference.

And we know that six subtract two is equal to four.

The difference between six and two is four.

So there were four more butterflies than spiders.

Well done if you got that one.

B, how many fewer snails than ladybirds did they find? Hmm? How many fewer? I know that I can find the difference because that will show me how many fewer.

They found nine lady birds and two snails.

Nine subtract two will be equal to the difference.

So nine subtract two, we know is equal to seven.

The difference between nine and two is seven.

So there were seven fewer snails than ladybirds.

Well done if you got that one.

And C, there might have been more than one answer here.

Which two minibeasts have a difference of four? The difference of four means it could be four more or four less.

We can see that there are four more butterflies than snails.

So you may have said this as one of your answers, but we can also see that we found two spiders.

So you might have also said that there were four more butterflies than spiders.

Well done to you if you found either of those answers or a super well done if you found both of them.

Let's move on then to the second part of our learning.

Interpreting information from a pictogram.

Let's go.

Class three decided to make their pictogram differently to the other classes.

Hmm.

Have a look at that pictogram.

What do you notice? What's different? Hmm.

I can see that they've got different minibeasts, but I don't think that's what we are thinking about here.

Laura, Andeep, can you help us out here? I'm not quite sure.

Laura has noticed that the key is different in this pictogram.

Of course.

But what does that mean, Laura? The key tells us the number each picture represents.

On this pictogram, each picture represents two mini beasts.

Of course, because in the other pictograms they represented one.

So what's that going to mean for this pictogram then Laura? So that means that we are going to have to count in our twos, instead of ones, to find out how many of each minibeast they found.

Andeep's not sure.

So did they only find one woodlouse or two? Hmm.

So remember, each picture is worth two.

So what do you think? Did they find one woodlouse or did they find two? Each minibeast is worth two.

So there is one woodlouse on the pictogram, but that represents two.

So that means that they must have found two woodlice.

Do you see now Andeep? I think Andeep might need another practise, Laura.

Could you give him another one? How many worms were there then, Andeep? We can see that there are two worms on this pictogram.

Each one represents two.

So remember you can count in your twos, Andeep.

Two, four.

So that means that they must have found four worms. Is Andeep correct, Laura? Yes, they did find four worms. Well done Andeep.

So remember, when you're working with pictograms to really carefully look at the key to make sure that you are reading the information correctly.

I think we might need a little bit of practise of this.

So over to you then for check one.

What other information can you gain from this pictogram? Remember, each mini beast is worth two.

So using this stem sentence, can you read some information from this pictogram to share with the people around you? Class three found mm-mm in their garden.

So simply read the information and create your stem sentences.

Come on back once you've managed to explore the whole pictogram.

Welcome back.

I hope you enjoyed exploring that pictogram there and didn't fall into the trap of counting in ones rather than your twos.

Come on then Laura and Andeep, give us some of your stem sentences.

Class three found 16 ants in their garden.

Hmm, let's check.

2, 4, 6, 8, 10, 12, 14, 16.

They did! Well done, Laura.

What did you notice, Andeep? Andeep noticed that class three found eight snails in their garden.

Let's check it.

Two, four, six, eight.

Well done, they did.

Well done to you for interpreting your first pictogram.

Let's continue with our learning.

Andeep wants to know if we can still compare numbers on this pictogram.

Yes, we can still compare numbers on this pictogram, Andeep.

Should we have a go? How many more ants than beetles did class three find? How are we going to work that out? Andeep notices that they found 16 ants and 12 beetles, just like we have been doing.

Andeep can subtract the known part from the whole to calculate the unknown part, which is going to be the difference.

So 16 subtract 12 will give us the difference.

16 and 12 are close together, so we can count on.

We start at 12.

Four more is 16.

So we know that there are four more ants because the difference between 16 and 12 is four.

Well done there, Andeep.

I love how you used your counting on strategy there because she realised that those numbers were close together.

Laura remembers a way to use the pictogram to help her.

She's going to use the pictogram to check Andeep's answer.

We can count on from the beetles, the part, to the ants, which is the whole.

We can see that there are two more ants.

We know that each of those ants represents two.

So two, four.

So we now know that that represents four more ants.

Well done Laura.

I love how you're using the pictogram there to help you.

But remember, this pictogram represents two.

So make sure that you're counting accurately depending on what your pictures represent.

Over to you then.

How many more snails than worms did class three find? Don't forget, each of those pictures represent two.

Have a go at finding how many more and come on back when you're ready to continue.

Welcome back.

Let's see how you got on then.

We can see that they found eight snails and four worms. We can count on in twos from the worms, the part, to the snails, the whole.

Two, four.

So we can see that this represents four more snails on the pictogram.

Let's check this by using subtraction.

Eight subtract four is equal to four.

So yes, that is correct.

Class three found four more snails than worms. Well done to you if you were able to use either of those strategies to find that there were four more snails.

Let's continue to practise this then in task B.

Task B is for you to answer some questions left by class three about their minibeasts pictogram.

A is how many fewer laid birds than ants did class three find? B is find two minibeasts that have a difference of four.

And C, the class found eight fewer butterflies than beetles.

Can you add the butterflies onto the pictogram? Pause this video and come on back once you've had a go at task B to see how you've got on.

Welcome back.

Let's have a look then.

A, how many fewer lady birds than ants did class three find? They found six ladybirds and 16 ants.

We know that we can subtract six from 16, which will equal to the difference.

I can see that I'm subtracting the ones there, which I know will leave me with 10.

So we can say that the difference between 16 and six is 10, so there were 10 more ants than ladybirds.

Let's check that.

I can see that there's that many ants more.

Two, four, six, eight, ten.

Yes, I'm correct.

Well done to you if you said 10.

B, find two minibeasts that have a difference of four.

We know that the number of woodlice and ladybirds have a difference of four because I can see two more ladybirds than woodlice.

You might have said the number of worms and the number of snails.

Again, we can see two more snails than worms, so that means they have a difference of four.

You might have said the number of ants and beetles, because again, look, two more ants than beetles on our pictogram.

That represents four.

And finally, you might have said the number of snails and beetles.

Look, two more beetles, which represents four.

Well done to you if you found some of those answers.

And C, they found eight fewer butterflies than beetles.

Add the butterflies onto the pictogram.

We know that they found 12 beetles.

12 subtract eight.

The difference will be equal to the number of butterflies.

So 12 subtract eight.

Hmm.

Let's count on, eight and four more is 12.

So we know that they must have found four butterflies.

Four butterflies is represented here by two pictures because remember, two, four, they represent two.

Well done to you if you worked out that there should have been two butterflies on that pictogram.

Well done for completing task B.

Let's have a look at what we've learned today.

A pictogram is a graph that uses pictures to represent information.

A pictogram's key tells us what each picture represents.

The whole subtract part is equal to the difference.

We can calculate the difference by counting on from the known part to the whole.

Well done for all of your hard work today.

I hope you've enjoyed applying your difference knowledge into a new context.

I can't wait to see you all again soon for some more maths learning.

Goodbye.