Lesson video

Hi everyone this Miss Mitchell here.

Today lesson we're going to be identifying suitable bar models to represent problems. In this lesson we'll be identifying suitable bar models to represent problems. We will be matching bar models to the correct word problems. Then I'd like you to complete the worksheet and then a quiz.

For today's lesson, you will need a pencil and some paper.

Pause this video now to get this if you have not got it already.

Here I have two word problems and two bar models.

I need to match the correct word problem to the bar model.

Let's read the first problem together.

42 people live by the seaside, 34 more people live in the countryside.

How many people live in the countryside? What is known and what is unknown? We know that 42 people live by the seaside.

Now, by looking at these two bar models, I can see that both of them show this information.

I know 34 more people live by the countryside.

But I don't know what the number is.

By looking at this bar model, I can see that this matches to the problem because here, it shows that 34 more people who live by the countryside.

And here it shows that we don't know the value of the number of people that live by the countryside.

Let's read the second problem to check that it matches up with the other bar.

42 people live by the seasides and 34 people live in the countryside.

How many people live in both areas? So in this bar model, we know that 42 people live by the seasides and we know that 34 people live in the countryside.

We want to know how many live in both, which means we are looking for the whole how do we find the whole? We add two parts together.

Does this bar model match to this problem? Yes, it does, because here it shows the whole is unknown.

So this question I will read the two word problems and I would like you to match the word problem to the bar model.

Here's the first problem.

76 people live in the seaside and countryside.

42 people live by the seaside and the rest live in the countryside.

How many people live in the countryside? Here is the second word problem.

76 people live in the countryside.

34 fewer people live by seaside.

How many people live by the seaside? Pause the video here to reread the word problems and see if you can match it to the correct bar.

Well done.

Let's see what information we know from the first problem.

We know that 76 people live in the seaside and countryside.

Now already only one of these bar models show this information.

And that's this one here.

As in this bar model, it says 76 people live in the countryside, and seaside.

Let's keep going to check.

42 people live by the seaside.

Which bar model shows this information? Again is this one here because here it shows that 42 people live by the seaside.

But on this bar model, it shows that the number of people that live by the seaside is unknown.

So this word problem over here matches with the bar model.

Let's read the second word problem and check that it matches with the other one, 76 people live in the countryside.

34 fewer people live by the seaside.

How many people live by the seaside? We can see that this matches with this bar model here.

Because here it shows 76 people live in the countryside.

And here it shows that 34 fewer people live by the seaside.

And here it shows that we want to know how many people live by the seaside.

Great job.

Where would you rather live, by the seaside or by the countryside? I think I'd rather live by the seaside as I love swimming.

Here are two word problems and two bar models.

Can you match the correct bar model to a word problem? Here's an extra challenge.

Once you've matched them, can you solve the word problems? Pause the video now to have a go.

Well done and here are the answers.

What do you notice about the answers? They're the same.

Let's do another problem.

There are 76 pink flowers.

There are 21 orange flowers.

How many flowers are there altogether? What information do we know? We know that there are 76 pink flowers and 21 orange flowers.

Which bar model shows this information.

Is this bar model here because this bar model shows that there are 76 pink flowers and here it shows there are 21 orange flowers.

We want to know how many there are altogether and that is unknown.

So that shows here.

Now let's read the second word problems to check.

There are 76 pink flowers.

There are 21 more orange flowers.

How many orange flowers are there? Now I can see that this word problem matches with this bar model over here because I know that there are 76 pink flowers and I know that there are 21 more orange flowers.

But it is unknown how many orange flowers there are.

That is represented by the question mark.

Well done.

Here's the final problem before your independent task.

For this question, I will read the two word problems just like before, and I would like you to match the word problem to the bar model.

Here is the first word problem.

There are 76 pink flowers.

There are 21 orange flowers.

How many more pink flowers are there? Here is the second word problem.

There are 76 pink flowers.

There are 21 fewer orange flowers.

How many orange flowers are there? Pause the video here to reread the word problems and see if you could match it to the correct bar model.

Lets see how you got on? What information do we know from the first word problem? We know how many pink flowers there are which is 76.

And we know how many orange flowers there are, which is 21.

What is unknown is how many more pink flowers there are? Which bar model shows this information.

It's this one here.

Because the unknown is how many more pink flowers? It's not asking me how many orange flowers, let's now read the second word problem to check.

There are 76 pink flowers.

There are 21 fewer orange flowers.

How many orange flowers are there? Does this match to the word problem? Yes, it does.

Because here it shows the 76 pink flowers.

Here it shows the 21 fewer orange flowers.

And here is the unknown, which is the amount of orange flowers there are which is represented by the question mark.

Fantastic.

For your independent task, I would like you to match the word problem to the correct bar model for your star challenge on to the word problems using the bar models to help you, pause the video now and then press play when you are ready for the answers.

And here are the answers.

Did you manage to complete my star challenge? Great work today.

If you would like to share your work with Oak National, then please ask your parent or carer to share you work on Twitter tagging @OakNational and #LearnwithOak.

You've done a great job.

So why not challenge yourself and see if you can complete the quiz.

Well done bye.