Lesson video

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

In today's lesson, we're going to be consolidating and applying our knowledge about four digit numbers.

Now, that's going to mainly mean that we're looking at three different things.

The first of those things is we're going to be looking at place value, then we're going to be looking at adding and subtracting, 10, 100 and 1,000.

And finally, the third thing is we're going to be looking at rounding to the nearest 10, 100 and 1,000.

So I hope you've got your brain switched on today, because we've got quite a lot of thinking to do.

And we're going to be switching a little bit from topic to topic.

Don't worry, we're going to do it together, and we'll go through some examples together first, there's nothing to worry about at all.

If you can, can you please switch off any notifications on your tablet, phone or whatever device you're using to access today's lesson.

Then, if you can try find somewhere quiet in your home where are not going to be disturbed and while we can get on with our math learning together today.

When you're ready, let's begin.

Over and let's run through the today's lesson agenda, it might look a little bit different to any other lesson agendas you've seen before, because we're going to be doing a little bit of a different way today.

So what we're going to do is, we'll do an example of the question together, that will be paused and will be time for you to have a go.

And then we'll resume and we'll discuss it together.

Sometimes I might ask you, now there's another question that's similar.

Have a go on your own and then we'll discuss the answers together again.

Okay.

As I said in our introduction, we're going to be mainly looking at place value, looking at adding and subtracting 10, 100 and 1000.

And then we're going to move on to looking at some rounding at the end of the session.

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

Please pause the video now to go and get those things, if you haven't got them already.

Welcome back, let's get started then.

So, the first thing that we're going to do today is, we're going to be looking at place value, and we're going to be thinking, what is the value of the digit? So our example together, what is the value of the digit nine in the number 9345? What's the value of the digit nine? It's 9,000, is in the thousands column, therefore that nine represents 9,000.

What is the value of the two and the number 3,042? Well, the two is in the ones column.

So the two's value is two.

There we go, straightforward as that.

Looking at the number, the digit we've been asked to look at, then looking at the number and working out which column it's in to decide what it represents.

So this time, it's your turn.

Pause the video now to have a look at the next two questions, then we'll go through the answers together.

Okay, let's have a look at the answers then.

So, what's the value of the digit seven in the number 8,271? It's in the tens column.

So it must represent the number 70.

What's the value of the digit four in the number 3,664? In the ones column, so that four represents four ones, which is four.

This time, what I want you to do, is have a go at some questions on your own.

You have got three questions here, have a look carefully at which digit you're being asked to look at.

Pause the video now to have a go at writing down your three answers, and then we'll go through the answers together.

Okay, welcome back.

Let's go through the answers together then.

So, the value of the digit seven in then number 8,271, that's in the tens column, so that seven represents 70, seven tens.

What's the value of the digit four in the number 3,664? While it's in the ones column, so that four present four ones.

What's the value of the digit two in the number 9,280? Is in hundreds column, so that two represent 200, fantastic.

Next, we're going to move on and have a look at some digit cards.

So, look at these digit cards, we're going to do this example together.

Seven, four, five and two, make the greatest number possible using each digit card once, so I can't reuse my seven, I can't reuse my five.

So, I'm needed to make the greatest number possible.

I'm going to choose my seven first, because I know that I need to put the greatest number, the greatest digit into the greatest space possible.

Then I'm going to choose my five, my four and then my two, which is going to give me the number 7,542.

That's the greatest number possible I could make using these digit cards.

Okay.

Make the number with the least value possible, using each digit card once, okay then.

So I know if I want the least value, I need to put the number with the digit sorry, with the least value in the place of the most value, so the thousands column.

So I need to use my two and then I'm going to use my four, then my five, then my seven to create a number 2,457.

The highest placed digit goes in the lowest place value, which is our ones.

So I answered that question as well.

Now, this time, it's your turn, you've got new digit cards.

Pause the video now to have a go at making the greatest number possible, and the smallest number possible.

Remember, you can only use each digit card once.

Then we'll resume and look through the answers together.

I'll try them when you're ready, let's have a look at this together, we can do it.

So the greatest number possible with those digit cards is going to be the number 9,531.

The number with the least possible value, is going to be the number of 1,359.

Have a look at this question and this time it's completely your turn.

You've got so new digits here.

And this time, all you need to do is make the greatest number possible.

Pause the video now to have a go at this activity and then we'll go through the answers together.

Okay, then we'll come back, let's have a look at our answers.

So to make the greatest number possible from these digit cards here, we're going to need to use the greatest digit which represents the greatest value, which is a thousands columns.

So I'm going to use my eight first, then I'm going to use my six in my hundred, because that's my next greatest number then I'm going to use my three in my tens and my one in my ones, to give me the number 8,631.

Is the greatest number, I could make using these digit cards only once.

Right, we're going to move on now to adding or subtracting 10, 100 or 1,000.

So let's go through an example together first, and then I'll have, then you'll, sorry, have time to have a go at some examples on your own.

So, first one is 586 plus 10 equals 596.

I've added one ten to my tens column.

This time we can imagine it as a functional machine.

My numbers got EM, my number was 452.

And it's come back out as 352.

How many has been subtracted from this number? I look here in my hundreds column, I can see 100 has been taken away.

This time, I don't know what my whole was before 1000 was subtracted from it.

But I do know what my new whole is.

My new whole is 6,543.

I'm going to do the inverse, I'm going to add 1,000 onto it to find out what my original number was.

Which will give me 7,543.

Okay, then it's now your time.

Pause the video now to have and go completing your three equations.

And then in the moment, we'll go through them together.

Okay, welcome back.

Let's have a look together, then so, first one was 546 plus 10.

Oops, sorry, I got carried away there.

We can do it up, there ready, but you can see me running up the stairs.

Let's see, our answer 556.

823 subtract something is 723.

Well, I know they've taken 100 away.

Something subtract 100 is 3,092.

But it's 4092 because I do the inverse and add 1000 on to this number here.

Okay, then you have now got some questions, I would like you to answer on your own.

You've got six questions there.

So please pause the video now to go and answer these questions, and then we'll discuss the answers together.

Welcome back, right there let's go through the answers.

So, we're going to start here with 546 plus 10 gives us 556.

823 subtract something gives us 723, we're subtracting 100, the hundreds column it decreases by 100.

Something subtract 1000 is equal to 3,092.

It's going to be 4,092.

Then we have 3,803 plus 10, it's going to give us 3,813.

Check that place value, check whether you added that 10 into the correct column.

Next one, 3,406 plus something is equal to 3,506.

Well, I can see my hundreds column has increased by 100.

So it must have been 100 that was added to it.

Something add 1000 is 2,938.

while to take 1,000 away from that, so it's going to be 1,938.

This time, it's your time, you've got an inequality here, and it uses either 10, 100 or 1,000 in this missing box here.

Now this inequality sign tells me that this number here, is greater than this number here.

You need to make that true by using either 10, 100 or 1,000.

Pause the video now to have a go at this question.

Okay, then let's have a look at this section.

You could use either 100 or 1,000.

If you've written both in this box, you can't be correct, because you have to choose just one.

I've only written both to show you that there's two answers.

So if I added 100, I would get the number 2,422 which is greater than 2,400.

But added 1,000, I'd get the number 3,322 which again is greater than 2,400.

If I added the number 10, I would get 2,332 which is not greater than 2,400.

So if you put either 100 or 1,000 in this box, fantastic.

Okay then, now we're going to move on to some rounding and we going to think we rounding up or we rounding down.

So, we've got our number to look at together today.

The number we've got together is 2,455.

To round it to the nearest 10, we're going to round it to 2,465 because it's a five in the ones column, and if it's a five in the ones column, we know we need to round it up to the nearest multiple of 10, which is 2,460.

To the nearest 100 that it's going to round up to 2,500.

If I look in my tens column, to the nearest 100, it's the tens column we need to look at, I can see there's a five there.

If there's a five in the tens column, we need to round it up to the higher multiple of 100, which is 2,500.

To the nearest 1,000 there, let me look in my hundreds column and there's a four, there's a four in my hundreds column, I now need to run it down, to the lower multiples of 1,000 which would be 2,000.

Okay, you've got a different number here and like you to round it to the nearest 10, to the nearest 100 and to the nearest 1,000.

Pause your video now to have a go at this task.

Okay, welcome back, let's have a look at these answers here then.

So the number was 1,355, round to the nearest 10, is going to be 1,360.

We know if there's a five in the ones column, we know we need to add up.

To the nearest 100 then, again as a five in the tens column, so we've rounded up the nearest multiple of 100, which is 1,400.

To the nearest 1,000, there's a three in the hundreds column so you round it down to the lower multiple of 1,000 which is 1,000.

This time, it's your turn, you've got three different numbers for each equation.

I'd like you to have a go for each question, sorry, each question.

I'd like to forget rounding these first three, to the nearest 10, these next three to the nearest 100, and the last three to the nearest 1,000.

Then we'll go through the answers together.

Pause the video now to have a go at some rounding.

Okay, welcome back, let's have a look then at some answers.

So, 63 to the nearest 10 is 60.

825 to the nearest 10 is 830.

3,997 to the nearest 10 is 4,000.

It's one of those tricky ones, because the nearest multiple of 10 is also a four digit number and that means that we have to go all the way up to 4,000.

So well done if you've got that one correct.

Round to the nearest 100 then 28 round to the nearest 100 is going to be zero.

Remember, it can round down zero.

372 is going to round up to 400 because there's a seven in the tens column.

And 7,248 is going to round down to 7,200 because there is a four in the tens column.

Round to the nearest 1,000 then.

1099 is going to round down to 1,000 there is zero in the the hundreds column.

So we don't need to round down.

8,500 it's one of those tricky ones, it's exactly halfway between 8,000 and 9,000.

Because there's that five in the hundreds column, we know we need to round it up to 9,000.

And 472 round it down to zero.

Fantastic work today.

If you'd like to, please ask a parent or carer to share today's work on Twitter by tagging @OaknNtional and using the #LearnwithOak.

I've been really, really impressed With all of your hard work today, especially because we've been going through place value, addition, subtraction, and rounding, it's required lots and lots of really great brain power.

So I hope you had a really great rest of your day.

And I hope to see you again soon for some more math.

Thank you and bye bye.