# Lesson video

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Hello everyone I'm Miss Brinkworth.

I'm going to go through this maths lesson with you about graphs today.

So our learning objective is to interpret and present data in pictograms and bar charts.

Just to go through what our agenda looks like, we're going to look at matching different kinds of data, with different kinds of graphs.

We're going to think about the limitations of graphs, what they can't tell us.

We will, so then I'm going to have some tasks where we are completing pictograms and bar charts, where there's missing information, we're going to fill that in.

And then at the end, you'll have your independent activities and to answer an exit quiz, which allows you to see how well today's learning gone in.

So all you will need is a pen or pencil, some paper, and a big smile.

Great, let's get started then.

I'd like you to pause the video and just have a go at matching the table with the bar graph that shows the same information.

So a line is going to appear between each table and bar graph.

Which one matches? Have a go.

How did you get on? I wonder if he found matching some a little easier than others.

What I'm going to do is talk through how I would do it.

You might have had a completely different thought process and that's fine.

What I did was I looked at the sunny columns and this is because and they are right next to that y-axis.

So it's really quick and easy to see exactly what the sunny column is showing.

Also the sunny column is often the biggest amount, the largest, the most popular, the most common day.

So that's easy to focus in on really quickly.

So if I look at that first one where it says sunny is 10 on that first one, so I know that that one's going to match up over here with this table right on the far right, which has got sunny 10.

And then I went through the others and just thought about which one the sunny column matches up with.

I don't need to read every single column and every single piece of information on the table.

I can just focus in on one piece of information that's really easy to see.

Well done if you match those up correctly.

Okay, let's have a look at this graph then and think about what it shows us.

So we can see from the title, it's money spent by teachers on class parties.

So we've got four different classes, so four different columns along our x-axis on the bottom.

And then all y-axis has got that scale on and it's about the money spent.

And we can see that that scale, well, I wonder if you can tell me.

It goes zero, 10, 20, 30, 40.

Well what's that scale going up? What times table can you identify? It's the 10 times table, isn't it? So let's have a look at these questions and see if we can answer them from this bar chart.

Which class had the most money spent? So we looking for the column, which is the tallest with the most money going farthest up the y-axis, as the money gets higher, as it goes up.

And I really like on this bar chart, that the columns are different colours.

It's really easy to see, which is which.

So that orange column there is definitely the tallest and that's class two.

So for the first question, the answer is class two.

This next question then kind of flips it around.

Rather than asking which class, it's saying, it's giving you the amount of money spent, and it's asking you which class, rather than going for the, which was the most common, least common kind of question.

So it's a slightly different question, but it is still looking for the class.

In which class was 25 pounds spent? So this time I need to be a bit more exact with my answer.

So if I look, I can see that blue column there is in between 20 and 30, exactly halfway between 20 and 30, in fact, which is 25.

And that blue column, if I follow it down to the x-axis, I can see that that's class four.

Okay, the third question then says, which class had blue balloons? Can you see which class had blue balloons? We can't answer that question from this bar chart.

So this bar chart isn't about balloons.

We don't know which class had blue balloons.

So we can't actually answer that question.

So we can see that because this bar chart is about parties, that doesn't mean we can answer absolutely every question about the parties.

Bar charts are very specific.

All this bar chart shows us is how much money was spent in four classes.

Let's have a look at that last question then.

Which class spent 10 pounds less than class two? So we're looking for one which is 10 pounds below class two.

Well class two is that orange column.

So we need it to go down from 30 to 20.

Two of those jumps, 'cause they're five each, those little rectangles.

And it's class three that had 10 pounds less spent then class two.

Okay, let's move on.

Your turn to have a look at this next bar chart and answer these questions.

I'll give you a little bit of a clue before you get started.

One of them can't be answered.

Have a go.

How did you get on? Where you able to answer how many people visited over on Saturday? Could you see that? Is that something that this chart tells us? Yes, it is.

It's a chart about visitors to Dover and Saturday's included on it.

So we can answer that question.

And Saturday is lined up perfectly with nine.

Yes we can answer that question.

The answer is nine.

On which day did 15 people visit? So this time we've already been given our y-axis, 15, and this time we're looking for our x-axis.

Which one matches up with 15? Well having a look we can answer that question because one of them, does in fact have 15 people visit.

Which day did it rain? Can we answer that question? We can't, because this bar chart isn't about the weather.

We can't answer that question.

Well done if you could see that, really well done.

Okay, here we have a pictogram or we have a table and we need to fill in the pictogram.

I've made a start already.

I've started filling in October.

Do you think I've finished filling in October? Do you think I've done that? Do you think I've done all of October? Have a look at the key and how many I've put in.

Do you think my pictogram matches my table? Well the key says that each cloud represents two centimetres.

October on the table is 10 centimetres.

Have I put in enough clouds to represent 10 centimetres.

For 10 centimetres, I need two, four, six, eight, 10.

I need five clouds and I've only put in four.

I need to put in another cloud There we are, there's October, matching from the table to the pictogram.

Pause the video here and have a think about filling in the rest of those months and how much it rained.

Let's see how you got on everybody.

So if we move on, November has got 12, so that's just two more than October.

So we'd expect it to look exactly the same as October, with just one more cloud.

Remember one cloud represents two, so we have to read that really carefully on a pictogram.

December is one less than October.

So we don't get as many as October.

We only get four.

Two, four, six, eight, we need four clouds there.

January is 10, so that one will be the same as that first one.

It will have five clouds.

February just four, so a smaller number, a smaller number of clouds.

To represent four we just need to go two, four.

Well done.

And March then is six, two, four, six.

And April back to four.

Well done if you had a go drawing some clouds and you've got that one right.

Really, really well done.

So there we have a table and pictogram showing exactly the same information.

What about then if we wanted to put that information onto a bar chart? Here's a bar chart which I've started.

What else do I need to fill in? So I've got my table there.

I need to fill in some information on this bar chart.

You can see I've put all the months along the bottom, on the x-axis.

So I need to fill in my scale on the y-axis, don't I? Looking at those numbers, they range from four, they've got six, they've got 10, they've got eight, they've got 12.

Can you see any similarities between those numbers? They're all in that two times table So it probably would work quite well to have a scale of two.

And doesn't go up very far.

I wouldn't need to keep going in my twos to a very large number because the largest number on it is 12.

So I could do my scale in jumps up two.

And I need to leave the same gap each time because the gaps represent the same thing.

They represent two.

I've got up for 14, which is just one higher than I need to just to show that two times table.

And then I can start putting my information in.

So I've put October in.

October goes up to 10 and then I just need to put in the rest of them.

I want the columns to be the same width and I want them to be the same distance apart.

But obviously there'll be different heights because the table shows different amounts for each month.

So there's November going up higher than October.

December lower at eight.

January matching October there, exactly the same matching along the y-axis.

February's already there.

March is just six.

So going up to six and then I can see that April will be the same as February.

So when we complete bar charts, it's really useful to think about the scale that we want, looking at the numbers that we used in our data and seeing if there are any similarities.

We need to space it out evenly and then it becomes really easy to read.

That bar chart really accurately shows that information.

Okay, it's that time for you to pause the video here and have a go at your independent activities.

Please take us as long as you need and start the video again when you're ready.

We'll go through some of your answers.

Let's see how you did.

Okay so you've been given some data about the number of people who bought ice creams on different days.

And I've asked you to make a pictogram or a bar chart using that data.

We've given you the title and I've asked you to make up some questions about it as well.

It would be really good if you've managed to come up with a question that can't be answered.

So maybe you did a pictogram and it looks something like this.

I chose smiley faces and I chose them to represent 10.

Because if we look at our data, they're quite big numbers.

They go all the way up to 100.

So quite important for our pictogram scale to be quite big.

If I just use two, for example, if each smiley face represented two, needed to go all the way to 100 I'd need to use lots and lots of smiley faces, and it would be quite confusing for my reader to read.

So I decided to pick 10 for my key on that pictogram.

Maybe you decided to do a bar chart.

And hopefully it would look something like this.

And it makes sense to start with Monday is that's the beginning of the week and move through that way.

And I've picked a scale of, it's going up 25 this time actually, 25, 50, 75, 100.

But I could have put 10.

I probably could have put five as well, but I picked a different scale there.

It's really easy to say the day where there was the most ice cream sold and days where it wasn't as popular.

And we might be able to say things from this chart, like most people, the most popular day for an ice cream was Friday or on Thursday 50 ice creams were sold.

Would we be able to tell which flavour ice cream people bought? We wouldn't would we? So that might've been a good question if you were coming up with one that couldn't be answered from this data.

Okay and then we have some true or false questions here with this second part of your independent task.

So let's see how you got on.

It's quite simple bar chart this.

Amazing how many questions we can get from quite a simple bar charts.

So just true or false or for some of the questions you couldn't say.

That information's not on the bar chart.

So 10 more have red coats than green.

That is true.

You can see that information on the bar chart and it's true.

So well done.

Girls prefer green coats.

Well, we don't know about preferences and we don't know about girls and boys, so that we can't tell.

12 people have blue coats.

True or false? That's false.

Blue doesn't line up with the 12 on our x-axis there.

Blue is the least popular choice? Well, it's easy to see that that's true.

Blue's our smallest column.

Double the number of people prefer green over blue.

That one is false.

Our green column is not twice as big as our blue column.

And it was a rainy week.

We can't tell that from that information, so well done if you could see that.

That's fantastic work.

If you got all of those correct, really, really well done.

So I was trying to trick you and catch you up and you didn't let me, really good.

Okay, if you would like to please ask your parent or carer to share your work on Twitter, tagging @OakNational and #LearnwithOak.

Now it's time to complete your quiz and see how well you got on with today's learning.

Well done everybody.