Lesson video

Hello, everybody.

I'm Mrs.Crane and welcome to today's lesson.

In today's lesson, we're going to be finding the odd one out.

I'll explain a little bit more about what that means in a moment.

But for the moment, can you please make sure that all of your notifications are turned off on your devices, and that if you can find somewhere in your home, that's nice and quiet and distraction free.

So that we're ready to begin.

Are you having a nice day? I hope you are.

And I hope you're ready to do some detective work and spot the odd one out.

We're going to start off by looking at our lesson agenda.

So to begin with, we're going to be looking at what's the same and what's different? Then we're going to be doing our let's explore which is going to bear some matching statements, with some different number grids.

Then we're going to be discussing the different solutions that we could have come up with.

Finally, it'll be time for your independent task, which is the odd one out and we'll go through and discuss it together at the end.

Okay.

So for today's lesson, you'll need a pencil and some paper.

You haven't got those things already, please pause the video now to go and get them.

And okay, welcome back and let's get started.

So what's the same and what's different? I've had a little spot at these numbers here, and I think I've spotted an odd one out.

Which number do you think I've chosen? And why do you think I've chosen that? I'll give you a couple of seconds to read through those numbers and then we'll read through them together and discuss this here.

Okay, let's read through the numbers together and see if you can spot an odd one out and explain why? So the first number is, 7364.

Second number is, 6734.

Third number is, 6334.

And the fourth number is, 7463.

Which one? Do you think I've chosen as my odd one out? Wow! I'll let you into a clue.

I've chosen this number here.

Why don't you think I've chosen this number here as my odd one out? Well done.

I've chosen this number here as my odd one out because it's the only number that has a three in the ones column.

But all quite similar numbers if you noticed, they all use the same digits.

But similar digits apart from this one, they all have a seven, a four, a six or a three in them.

Seven-six-three-four.

Seven-three-six-four.

Six-three-three-four.

Ooh!You could say that! This number here, is also an odd one out because it doesn't use the digit seven in the number.

So what we're going to do is we're going to run through and think about different reasons why these numbers could be odd ones out.

Okay, then what would to do is have a look at the value of each digit in the numbers.

So, looking at this number here, act like we were talking about a moment ago, we can see clearly that in the ones column the three it has a value of three.

And the other numbers, there's all ways a four.

If we check, let's have a look at the 100s column.

This number has a three, this number has a three, this number has a four, this one has a seven.

So I could say this is the odd one out because its got a seven in its 100s.

Or I could say this one's the odd one out because its got a four and its 100s.

Could I say, that either of these two numbers are odd because they have a three in the 100s? I couldn't, because both of them have it means that they can't be the odd one out.

It has to be a number where it's the only number that does something or has something of a certain value, or maybe rounds to something.

We'll have a look at some more examples in a moment.

Let's have a look then at what the greatest number is.

So to find the greatest number, we always have to start in the column with the place with the greatest value.

So I can see here in our 1000s, this has 7000 and so as this number, then in to at look my next column, which is my 100s.

There's a four, this is a three, I know that four is greater than three.

So my greatest number is 7463.

My smallest number then, well, it can't be this one.

So it's got to be between these two, if both got 6000.

This one's got 300.

And this one's got 700.

So this one is our smallest number.

And it's the number 6334.

So I could say this is the odd one out because it's the smallest number.

I could say that this is the odd one out because it's the greatest number.

All of the numbers, odd or even let's have a look ends in a four says even, ends in a four says even, ends in a four says even, ends in a three says odd! So I could say this number here 7463 is the odd one out, because it's the only odd number.

Can I say, this number here is the only odd one out because it's the only even number? I couldn't, it's not the only even number we have three even numbers.

So remembering they can only be the odd one out, if it's the only number that does something or has something.

Do all of the numbers have the same map digits? They do in this example that all four digit numbers, So I can't use that as a reason for one of them being an odd one out.

And what happens, when you round each number to the nearest 10, 100 or 1000? So let's take our first number 7364 rounded to the nearest 10.

It rounds down to three to 7360, round it to the nearest 100 and it rounds up to 7400.

Round to the nearest 1000 and it rounds down to 7000.

Let's have a look at our next number then this number here 6734 rounds down to 6730 when rounding to nearest 10, to the nearest 100 is 6700 and to the nearest 1000 is 7000.

Ooh! I wonder do you think all of the numbers round down to 7000? Or round up to 7000? Next number then, is the number 6334.

That number rounds down to there is 10 as 6330, rounds down to the nearest 100 to 6300.

And it rounds down to the nearest 1000 to 6000.

And the last one, 7463 rounds down to the nearest 10 which is 7460, rounds up to the nearest 100 which is 7500, and round down to the nearest 1000 which is 7000.

So, from looking at those numbers here, I could say the number 6334 is the odd one out.

Because its the only number that doesn't round to 7000, when it's been rounded to the nearest 1000.

Can you spot what I'm doing? So I'm picking out different reasons, why each number could be an odd one out.

So let's have a look at what you're going to do for your let's explore today.

It's going to be matching statement with some number grids.

So, I'm just going to have myself for a moment so you can see exactly what I'm looking at.

So here you've got four different number grids, here.

And each of the grids, you've got one number that's been circled and highlighted.

Now, on this step.

Side here, sorry, you've got four statements.

These statements relate to one of the numbers in each of these grids.

So what I would do to solve this, is look at the grid really closely, and then decide which statement applies to that grid.

Okay! Oops! If you could pause the video now, to have a go at today's let's explore.

Then we'll go through the answers all together.

Okay, welcome back.

Let's have a look at our answers then.

So I'm going to put myself back on the screen, I'm just going to move myself so we can quickly look at the first one.

So don't worry about not seeing these two statements.

We'll see that in a moment, and I'm with myself again.

So the first one, we're going to look at this grid here.

And we identified that this number here is the only number when rounded to the nearest 100, which rounds to a three digit number.

So let's look more closely at this statement.

So if you look at the other numbers in this grid, you can see the number 1837, rounds up to 2000.

You can see the number 6471, rounds down to 6000.

And number 973 rounds up to, 1000.

So all three of those numbers bound to a four digit number.

The number 937 doesn't, it rounds down to 900, which is a three digit number, which is what makes that number the odd one out.

Let's bring them back at our grid.

Okay.

So, it's the only number which when rounded to the nearest 1000 does not round to 4000 is going to be this number from this grid here.

Let's have a look in more detail.

At that, I'm just going to move myself up and out of the way.

So here you can see, it's telling us this is the only number that rounds that doesn't round to 4000 when rounded to the nearest 1000.

So let's have a look.

The number 4275 does round down to 4000, number 3573, Yap!Rounds up to 4000 and number 3709.

Yap! Rounds up to 4000.

The number 4501, rounds up to 5000.

Well done.

Well then if you spotted that one? It's quite tricky.

You've got to really work out where they round.

Go back to our grid again there.

This time, we're looking at this statement here, the only number that has fewer than 5000s.

Have a look at this grid in more detail then.

So here's our grid.

6973.

Yap, it has got more than 5000.

5838.

Yap, definitely got more than 5000.

8312.

Yap, more than 5000.

4907.

Yap, it is the only number that has fewer than 5000s.

Okay, and our last one then, it's the only number which rounds to a lower multiple of 100 is meant to be this number here.

So let's have a look in more detail, at this grid.

So, let's have a look at this number here.

7483.

Definitely rounds up to a higher multiple of 100, because it's been eight in the 10s column.

1057, also rounds up to a higher multiple of 100, because of that five in the 10s column, and 79 rounds up to a higher multiple of 100, which is 100.

Because seven in the 10s column.

Let's check then 648, is got a four in the 10s column.

So it rounds down to the lower multiple of 100.

So yeah, those statements match.

How do we find an odd one out then? So, if you're feeling really confident, and you think you can explain why one of these numbers is an odd one out, pause the video now to write down a quick explanation and have a go at telling me why it's the odd one out.

You might want to choose more than one number, to explain why it's the odd one out.

If you're not feeling so confident, don't worry, we're going to go through.

And we're going to look at a couple of reasons why these different numbers could be the odd ones out.

So, when I first look at this, the number that jumps out at me is the number 40.

Does that number don't pay you to? Why does that number jump out at you? Why do you think it jumps out at me? Well, it's the only number that's a two digit number here.

The other three numbers are all four digit numbers.

So I'm going to choose number 40.

And I'm going to say it's only two digit number.

Now, I'm going to remove that.

And we're going to go back to this, we're going to choose a different number.

This time, I am going to choose this number.

Here, 1209.

Woo! Why have I chosen, 1209? Can you think of a reason that might be the odd number? Let's see if your reasons the same as mine.

I've chosen this number, because it's the only number that rounds to 1000.

It's got a two and 100 column.

So rounds that to the nearest 1000, rounds down to 1000.

1630, rounds up to 2000 coz its got six in the 100 column.

1590, also rounds up to 2000.

Because that's five in the 100 column, 40 rounds down to zero.

I could also have chosen that number because it's the only number that has a nine in the ones column.

Every other number has a zero.

So, there's lots and lots of different reasons why you could choose the odd one out.

Did you choose a different number? Did you have a reason why your number was the odd one out? Fantastic! As long as you can explain and justify why your number was the odd one out and have a reason behind it, then there is no real right or wrong answer to these questions.

Okay.

Today's independent task is going to be odd one out.

So I'm just going to hide myself so you can see what you've got to do.

You're going to have a look at each grid and decide which is the odd one out.

I want you to think about how you know that's the odd one out.

Can you find a different number on the same grid that's the odd one out? Just like we've just done there.

Remember, there is no real right or wrong answer.

It's all in the way you explain it.

So you might want to jot down the grid, jot down a number and explain and write short explanation as to why you think that's the odd one out.

Okay.

Please pause the video now complete your task and we'll discuss the answers together once you're finished.

Okay.

Welcome back.

As I said, there is no real right or wrong answer.

So today, we can't go through the answers in our independent tasks.

We going to have a bit of a discussion.

So I'm going to choose one of these numbers and say why I think it's the odd one out.

For the first grid, I'm choosing, 408.

I'm choosing 408.

Because I can clearly say it's the only three digit number.

It's the only three digit number because it's not got a fourth digit hasn't got anything in the 1000s.

Did you choose a different number? Why did you choose your number? As long as you've got a good reason for why you chose your number, then your answer isn't incorrect.

Right.

Then let's have a look at two I'm going to look really carefully here at these numbers.

Ooh! I'm going to choose the number 321.

Why do you think I've chosen 321? I've chosen 321 because it's the only number that doesn't have a three in the ones column.

Did you have a different number to choose? Did you choose the number 353 because it's the only number that rounds up, to the nearest multiple of 100? You might have done.

Let's have a look then at question three, or I am going to choose the number, 9237.

Why do you think I've chosen the number 900.

Start again.

Number 9237.

I've chosen it because it's the only number that has more than 6000s.

Coz the rest have less than 6000s.

They are four, one and 2000s.

Or did you choose the number 5023? Because the only number it doesn't have any 100s and has a placeholder instead? Perhaps you did.

Let's have a look at question four.

I'm going to choose the number.

Uh! One.

Why do you think I've chosen the number one? It's clearly a one digit number.

Did you choose a different number? Well done! As I said before, there is no real right or wrong answers to today's independent task.

It's just about you explaining why you chose it and having a good reason behind it.

You could have chosen any of the numbers in any of the grids as long as you've got a reason for choosing that number.

If you'd like to today, please ask a parent or carer to share your work from today's lesson on Twitter.

By typing @OakNational and using the hashtag LearnwithOak.

Great work today.

I've been really really impressed at you spotting doing some detective work, finding the odd one out.

Hopefully I will see you again soon for some more math lessons.

Thank you and goodbye.