Lesson video

(no audio) <v ->Hello, my name's Mrs. Cornwell</v> and I'm really pleased to be working with you today.

We're going to use some of the things you already know to help you with some new learning, and I know you're going to do really well.

So let's go.

So today's lesson is on counting forwards and backwards in steps of 10, up to 100, using the decade numbers to count.

And it comes from the unit, Counting in Tens Decade Numbers.

And by the end of today's lesson, you should be able to recite the decade numbers, names from zero to 100, going forwards and backwards, and you should be able to notice the patterns in the count.

So the words that will be important for our learning today will be the names of the decade numbers, 60, 70, 80, 90, and 100.

So our lesson today, in the first part of our lesson, we're going to count forwards in steps of 10 to 100.

And then in the second part of the lesson, we're going to count backwards in steps of 10 from 100.

In this lesson you will meet Andeep and Laura, and there they are.

So count forwards in tens up to 50.

0, 10, 20, 30, 40, 50.

Okay.

When we reach 50, we can continue counting in tens up to 100.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

So count forwards in tens to 100 in a quiet voice.

So we're going to practise counting in tens lots of different ways to get us really confident.

Okay, so let's try in a quiet voice first of all.

Are you ready? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

Now let's try an loud voice.

Are you ready? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

And now let's do it quickly.

Are you ready? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

And now can we do it slowly? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

And can you do it flashing your fingers as you count? Remember, no fingers for zero because zero means nothing.

But we can flash to show we've reached a decade for the other numbers, can't we? Are you ready? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Well done.

Excellent.

So already you should be feeling more confident counting forward in tens.

Because the more we practise, the better we get.

We know we can continue a count to help us find the next number in a count, can't we? So we can start 0, 10, 20, 30, 40, 50, 60.

What will the next number be? That's right.

We know that when we count the order always stays the same.

So after 60 it will be 70.

0, 10, 20, 30, 40, 50, 60, 70.

So your turn again, counting tens to a hundred and say the next number in the count.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90.

Oh, so have a think about what number you think will come next.

That's right.

So what do we think it is? That's right.

100.

When you count, after 90 comes 100.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Okay, so we know we can continue a count to find missing numbers.

0, 10, 20, 30, 40, 50, 60.

Hmm.

What will be the next numbers in this count? What do we think? So we can start from zero again, can't we? And we can count or you could count from 60 and count on as well, can't you? So let's have a try.

Let's start from 0.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90.

Well done.

Excellent.

Okay, so now it's your turn.

Continue the count and say the missing numbers.

0, 10, 20, 30, 40, 50, 60, 70.

And you think about what numbers come next.

(no audio) That's right.

Let's start them.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

Okay, so listen carefully, Let's see if you can spot a mistake.

<v Announcer>10, 20, 30, 40,</v> 50, 60, 17, 18, 19, 20.

<v ->Okay, what did you think then? What did you spot?</v> That's right.

You may mix the decade numbers with the teen numbers.

And so we've got to remember the decade numbers end with -ty, don't they? And the teen numbers end with teen.

So you had 17, 18, 19, instead of 70, 80, 90.

Okay.

And then let's listen to this next example.

<v Announcer>0, 10, 20, 30,</v> 40, 50, 60, 70, 80, 90, 20.

<v ->Okay, what did you think was the mistake there then?</v> That's right.

90 sounds like 19, doesn't it? So that can get people muddled up when they're counting in decade numbers.

Okay, 'cause it can make it hard to think of the next number.

People think 19 and then 20.

But we've got to remember it's not 19, it's 90.

And so we say 90, and then it's 100, isn't it? That's right.

Okay, now it's your turn, and you're going to think about what mistake has been made.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 20.

Okay.

And there's Laura.

She's saying, "That doesn't sound quite right." So I'm gonna give you a bit of thinking time, see if you can spot what the mistake is.

(no audio) Okay, did you spot it? Yes, that's right.

It's at the end there, isn't it? 0, 10, 20, 30, 40, 50, 60, 70, 80, 90.

It should be not 20, but 100 shouldn't it? That's right.

Here's another one.

What mistake has been made? 0, 10, 20, 30, 40, 50, 60, 17, 18, 90, 100.

Okay, so have a think.

I'll give you a bit of thinking time, see if you can spot the mistake there.

(no audio) Okay, did you spot it? Let's have a look.

0, 10, 20, 30, 40, 50, 60.

Oh, and then we've got 17 and 18, but we know the decade numbers ending in -ty, don't they? And they have a zero.

So it should have been 60, 70, 80.

And there's Laura telling us, "You must listen carefully to the end of the number word, seven-ty, eigh-ty." And that gives us a clue that they're decade numbers, aren't they? Well done.

When we count forward in tens, we can start from any decade number, can't we? So let's count forward from 70.

70, 80, 90, 100.

Excellent.

Now let's count forward from 30.

30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

Now let's count forward from 40.

40, 50, 60, 70, 80, 90, 100.

Excellent.

Did you notice anything different about those numbers? That's right.

They're going downwards.

But Laura's there reminding us.

She's saying, "I know we are counting forwards because each number in our count is greater than the starting number." So even though the numbers are going down the page and they're in a different direction, because the numbers are becoming greater, we know that they're going forwards.

When we count forwards in tens, we can start from any decade number, can't we? We don't always have to start with zero or 10.

So let's try starting from some different decade numbers and counting forwards.

So count forwards from 70.

Are you ready? We start our count at 70 and we count 70, 80, 90, 100.

Well done.

Okay, let's count forwards from 30.

Are you ready? We start our count at 30 and we count.

30, 40, 50, 60, 70, 80, 90, 100.

Excellent.

Okay, let's count forwards from 40 now.

40, 50, 60, 70, 80, 90, 100.

Excellent.

Did you notice anything different about those numbers when we were counting? That's right.

They went down the page, didn't they? So were we still counting forwards? There's Laura and she says, "I know we're counting forwards because each number in our count is greater than the starting number." So we know that each number is worth a bigger amount.

It's the numbers are becoming greater, they're becoming more.

So we know that means we're counting forwards.

So here's another one for you.

I'm counting forwards in tens from 50.

What are the next numbers I will say? 50, 60, 70.

40, 30, 20.

60, 70, 80.

So it asks about what are the next numbers you will say after 50.

So you've already said 50.

What numbers will you say next? I'll give you a bit of thinking time to think about that.

Okay.

And what did you think? Let's have a look.

Yes, that's right.

So we say 50.

And so the next numbers after 50 will be 50, 60, 70, 80.

That's right.

Well done.

So can you find the decade numbers on the 100 square here? So we've got a 100 square.

And remember the decade numbers are always at the end of the line, aren't they? So what do you notice about them? That's right.

We know that they're at the end of each line and they all end in the digit zero.

So put your finger on the number 10, and we're going to skip counting tens along with me, pointing to each number as you count and saying the -ty part of the word in a louder voice, because that is one of the things that tells us that it's a decade number.

Are you ready? 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Well done.

You can start skip counting at any decade number, can't you? You don't have to start at zero or 10.

So let's skip counting tens with me from 80.

Are you ready? So here's 80.

80, 90, 100.

Excellent.

Okay, can you skip counting tens with me from 60? So we've got 60, 70, 80, 90, 100.

Excellent.

And let's skip in tens with me from 40.

So we say 40, 50, 60, 70, 80, 90, 100.

Brilliant.

That's excellent work.

So find the decade numbers on your 100 square.

Okay? And then start at 10 and count up to 100.

So I'm going to give you a little bit of time to do that now.

(no audio) Okay? Have you done that? Well done.

Okay.

And now put your finger on 40 and think about what is the next number you will count.

(no audio) Okay.

And now start at 40 and count up to 100 in tens.

Okay? I'll give you some time to do that.

(no audio) Well done.

Okay, so let's have a look then and see how we did.

Find the decade numbers on your 100 square.

So you've done that.

Start at 10 and count up to 100.

So we would've started at 10 and we would've said 20, 30, 40, 50, 60, 70, 80, 90, 100.

Okay, well done.

Now put your finger on 40.

What is the next number you will count? So there's 40.

So the next number will be 50.

That's right.

Okay, and then start at 40 and count up to 100.

So there's 40.

40.

So then we'll go 50, 60, 70, 80, 90, 100.

Excellent.

Well done.

Okay, so your task for today's part of the lesson is here.

It says, "Use the cards for today and put them in two piles." So you'll have a pile of decade number cards.

Okay? And those cards will tell you the number from which you start counting.

And then there'll be another pile of cards which tell you how to say the number.

So you can see there it says clapping, whisper, loud voice, squeaky voice.

So lots of different ways of saying the numbers.

Okay? And then you need a partner.

And we can see we've got Andeep and Laura here, and Andeep's partner A.

And he says, "I will pick a card from each pile.

We will count forwards together in tens from the number in the way shown." Okay? So he'll pick a decade number and a card that tells him how to say that decade number.

And then him and his partner will count together from that number.

Okay? And then when they finished, then the other partner, so Laura in this case, well, it will be her turn to choose two cards.

And then she'll have a decade number and a card that tells them how they will count.

And again, they will count together from that number.

And when they're confident, they can try with each partner saying alternate numbers.

So Andeep saying a number, and then Laura, then Andeep, then Laura, like that when they get really confident.

So have a pause the video and have a try at that now with your partner.

(no audio) Okay, so we can see we've got Andeep and Laura here, and they've got the cards, the decade number cards.

And the cards tell them how to say the number.

And we can see that Andeep's picked the decade number 30, and it tells him to say it in a whisper.

So he says, "I will start my count at 30 in a whisper." And they're going to do it together.

So when he starts and says 30, Laura will join in with him.

So then he'll say, "30, 40, 50, 60, 70, 80, 90, 100." Yeah, well done.

And then when they've done that together, Laura, she'll copy him and say it together with him.

Then it will be her turn to pick from the cards, won't it? And once they get really confident, they could take it in turns to say the numbers that have been picked, couldn't they? Well done.

You've worked really hard.

So now we're going on to the second part of today's lesson, which is counting backwards in steps of 10 to 100.

We can count backwards in tens from 100 to zero.

So 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Okay, so let's count backwards in tens from 100 in different ways to practise.

'Cause we know when we practise, that's how we become more and more confident.

So let's practise in a quiet voice first of all.

Are you ready? 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Well done.

Now let's try in a loud voice.

100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Okay, now let's try it quickly.

Are you ready? 100, 90, 80, 70, 60, 50, 40, 30, 20, 10 0.

Oh, that was a bit more tricky, wasn't it? And what about slowly? 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Well done.

And then you could do it flashing your 10 fingers as you count, couldn't you? Remembering not to flash your fingers for zero 'cause it means nothing, doesn't it? Are you ready? 100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Notice I didn't show any fingers for zero, 'cause that means nothing, doesn't it? Well done.

Okay.

We know we can continue a count to help us find the next number in a count, can't we? So if you've got 100, 90, 80, 70.

And then what would the next number be? That's right.

100, 90, 80, 70, 60.

That's right.

Okay, so you have a try at this one on your own then.

What number will I say next now? 100, 90, 80, 70, 60, 50, 40.

What do you think you will say next? I'll give you a bit of thinking time.

Did you get it? 100, 90, 80, 70, 60, 50, 40, 30.

So now continue the count backwards then.

Okay, so we've got 100, 90, 80, 70, 60, 50, 40.

And then there's three numbers missing there.

So continue the count, see if you can work out what they are.

That's right.

100, 90, 80, 70, 60, 50, 40, 30, 20 10.

Excellent.

And you could have gone back to zero as well.

We know we can continue a count to find missing numbers, can't we? So let's have a try at that.

So we've got here 100, 90, 80, 70, 60, 50.

Mm mm mm.

So three numbers missing there.

So can you work out what they are? Let's have a try.

Let's count from 100 again to try and find out.

100, 90, 80, 70, 60, 50, 40, 30, 20.

Well done.

Okay, so let's have a try on your own now.

And it says continue the count backwards.

Okay, so it says 100, 90, 80, 70, 60, and then you've got to work out the missing numbers.

So I'm gonna give you a bit of thinking time, okay? See if you can work out what those numbers should be.

Did you work it out? So let's go through it together.

100, 90, 80, 70, 60, 50, 40, 30.

Well done.

We know sometimes we may make mistakes when counting.

So let's listen and see if we can spot the mistakes.

<v Announcer>100, 90, 80,</v> 17, 16, 50, 40, 30, 20, 10.

0.

<v Mrs. Cornwell>Did you spot it?</v> That's right.

It was those teen numbers again, wasn't it? We may muddle the teens numbers with the decade numbers.

So they said 17 instead of 70, didn't they? We know we need -ty on the end for it to be a decade number.

And they said 16 instead of 60 and so on.

So we have to listen very carefully when we're listening for the decade numbers for that -ty sound at the end.

Well, let's have another try then.

<v Announcer>100, 90, 80, 70, 60,</v> five-ty, 40, 30, 20, 10, 0.

<v ->Oh, what was the mistake there then?</v> That's right.

We may say the digit we see at the start of the number.

So 50, when you see it written down, it looks like five-ty, doesn't it? Because you have 60 and 70, so you would think that would be five-ty.

But we've got to remember 50 is one of those tricky ones and it doesn't start with the digit that you can see at the front of the number, does it? So it's 50.

Well done.

So now we're going to see if we can spot the mistakes when we count backwards from 100.

Are you ready? 100, 90, 80, 70, 60, 50, 40, 20, 10.

Have a careful look.

Did you spot it? That's right.

So here we've got 100, 90, 80, 70, 60, 50, 40.

Then it should have been 30, shouldn't it? And then 20 and 10.

So sometimes when we count we can miss numbers out, can't we? Should have been a 30 in there.

Okay, so let's have a try on your own again here.

I'm counting backwards in tens from 100.

What mistakes have I made? See if you can spot this mistake.

Okay, I'll give you a bit of thinking time once I've said the numbers.

100, 90, 80, 70, 60, 15, 40, 13, 20, 10.

Okay, so have a little think and see if you can spot the mistakes.

(no audio) Did you spot them? That's right.

You can see by looking, and also when we say the numbers, we can hear, can't we? Let's say them together.

100, 90, 80, 70, 60, 15, 40, 13, 20, 10.

So that's right, it was that 15.

It should have been 50, shouldn't it? And 13, it should have been 30.

So you have to listen very carefully to the end of those numbers when you say them.

When we count backwards in tens, we can start from different decade numbers, can't we? Okay, so let's have a look.

Let's count backwards from these numbers.

70, 60, 50, 40, 30, 20, 10, 0.

Okay, let's try a different number.

90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

So it's your turn again now.

So I am counting backwards in tens from 70.

What are the next numbers that I say? So you can see 70 there.

So you've got to start at 70 and count backwards, and I'll give you a little bit of thinking time and then we'll go through it together.

(no audio) Okay, let's do it together then.

70, 60, 50, 40, 30, 20, 10, 0.

Well done.

So now let's count backwards from these numbers.

60, 50, 40, 30, 20, 10, 0.

And there's Laura and she's saying, "I know we are counting backwards because each number in our count is less than the starting number." So even though we went up, the numbers were getting less, they were becoming smaller.

The amount was becoming smaller, wasn't it? So we started at 60 and we counted up, and we know that every time we said the next number, it was getting less, wasn't it? Becoming less.

So we know that we're counting backwards.

Can you find the decade numbers on this 100 square then? 100 square.

So the decade numbers are at the end of each line, aren't they? So find the number 100, okay? And then let's skip counting tens with me backwards, pointing to each number as you count.

And make sure you say the -ty part of the word in a loud voice, because that's important in the decade numbers.

100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Well done.

You can start skip counting at any decade number, can't you? Skip count backwards in tens with me from 60.

So 60, 50, 40, 30, 20, 10, 0.

Let's go from 80 now.

80, 70, 60, 50, 40, 30, 20, 10, 0.

Try skip counting from different starting points in a different voice.

So you could pick some different ways to do that, can't you? Some different starting numbers and say them in a different way.

Okay.

And then here's one for you to try on your own.

Find the decade numbers on your 100 square and then start at 100 and count backwards to 10.

And I'm going to give you a bit of time to do that now.

Okay.

And then put your finger on 90.

What is the next number you will count? And then start at 60 and count backwards to zero.

(no audio) Okay, let's see how you got on.

Okay, so start at 100 and count backwards to 10.

Let's go through that together.

100, 90, 80, 70, 60, 50, 40, 30, 20, 10, 0.

Well done.

Okay.

And then let's put your finger on 90, and what's the next number you will count when you're going backwards? It is 80.

That's right.

And then start at 60 and count backwards to 0.

60, 50, 40, 30, 20, 10, 0.

Well done.

Okay, so here we've got the next task in today's lesson, and you can see it asks you to work in pairs, okay, using the cards that you've already used in task A.

So you've got a set of cards with the decade numbers on, and you've got a different set of cards that tells you how to say those decade numbers.

Okay? And there Andeep and Laura are working in pairs to do this activity, and they're explaining there.

Andeep says, "I will pick a card from each pile.

I will count backwards in tens from that number," so the number, the decade number that he chose, in the way shown on the other card.

And he will point to his 100 square to help him.

And Laura's there, and she says, "I will copy you." So when Andeep has counted the numbers backwards in a certain way, Laura will copy him.

She will do the same.

When they've done that, they will then take it in turns to say the numbers.

So they'll say the same numbers again, count the same numbers again from the same starting point, but with Andeep saying 70 and Laura saying 60 and so on.

Okay? And then when they feel really confident doing that, then Laura will pick a card and it will be her turn to count back in a certain way, and Andeep will copy her.

Okay? And when you get really confident with doing that, then you could have a try and see if you can count both forwards and backwards from the number that you've picked.

So pause the video while you have a try.

Okay, so let's see how we got on.

So we've got Andeep and Laura here, and we can see that they picked the number 40.

And here's Andeep, and he says, "We will count backwards together from 40, taking turns to say the number." So there's 40, so Andeep says, "30." "20," says Laura, "10," says Andeep.

"Zero," says Laura.

So they've counted backwards from 40, taking it in turns, haven't they? So, well done.

You've worked really hard in today's lesson, and hopefully now you feel lots more confident about counting forwards and backwards in tens, using our decade numbers, up to a hundred.

And let's think about what we learnt.

So when we were counting forwards and backwards in tens to 100, we found out that decade numbers are used when counting forwards and backwards in tens.

You can count in tens from any decade number.

When you count forwards, the numbers are greater than the starting number.

Doesn't matter which direction you write them in, it's about whether the numbers become greater or whether they become less.

And when you count backwards, the numbers are less than the starting number.

Well done.

You've worked really hard and I've really enjoyed working with you today.

(mouse clicks) (no audio).