Lesson video

Hello, my name's Mrs. Cornwell and I'm going to be working with you today, and we're going to be finding out all about money.

Okay, so I would imagine you already know quite a lot about money because we see it all around us every day, don't we? All different types of coins and notes.

So we're going to find out how we can use money in different ways.

We can use it to pay for items. We can add up how much money we've got.

And so the learning we do today is going to be really useful for us, isn't it? So I'm really looking forward to working with you.

I know you'll work really hard.

So let's get started.

So our lesson today is called find out how many 10 pence coins are needed to make a given value.

And it comes from the unit "Unitizing and coin recognition: value of a set of coins." Okay, so in our lesson today we're going to look at how many 10 pence coins are needed to make given amounts and to buy certain items, okay? 'Cause that can be really useful when you are shopping and buying things, can't it? Okay, so let's see what we're going to do.

So first of all, our keywords are ten-pence coins.

My turn, ten-pence coins, your turn.

And 10 p.

My turn, 10 p, your turn.

And value.

My turn, value, your turn.

And tens.

My turn, tens, your turn.

Excellent.

Well done.

And those words are going to be really useful for us today.

So in the first part of our lesson, we're going to find the correct number of 10 pence coins to pay for items, okay? And in this lesson you'll meet Sofia and Jun who will be playing with money and using money, okay? And learning how to pay for things.

Jun and Sofia have been using 10 pence coins when they play in their toy Post Office.

And there's the coins they've got.

Let's see how much money they have.

One 10 pence coin, two 10 pence coins, three 10 pence coins, four 10 pence coins, five 10 pence coins, six 10 pence coins, seven 10 pence coins.

"We have seven pence," says Jun.

Hmm.

And then Sofia says, "But we have seven coins, but each coin has a value of 10 p." Did you notice that? So it can't be 7 p for the total value of those coins, can't it? 10 p, 20 p, 30 p, 40 p, 50 p, 60 p, 70 p.

That's right.

The total value must be 70 p.

We don't count the number of coins, we count the value of the coins.

When we see 10 pence, we think 10 pennies.

We need to count in tens.

So we have 70 p.

They give each item in their post office a price and we can see some of the items there, can't we? Jun wants to buy the pencil sharpener.

How many 10 pence coins will he need, do you think? So this pencil sharpener is 30 pence.

So let's use these stem sentences to help us.

The pencil sharpener costs 30 pence.

Each coin has a value of 10 pence.

That's right.

So I will need.

So let's think about how we're going to work this out.

10 pence, 20 pence, 30 pence.

So we counted up to 30 pence and then we need to see how many coins we used.

One 10 pence coin, two 10 pence coins, three 10 pence coins.

So I will need three coins.

So here's Jun and he's collected some more 10 p coins.

He wants to buy the pencil.

And he says, "I will count in tens until I have enough money." So how many coins will he use to pay for it then? So we can see he has got six 10 pence coins there, but he may not need all six.

We're going to find out, aren't we? So let's see.

The pencil costs 50 pence.

Each coin has a value of 10 p.

So we're going to have to count in tens until we get to.

That's right, 50 p.

Are you ready? 10 p, 20 p, 30 p, 40 p, 50 p.

So now we know that Jun has enough coins, enough money to buy the pencil.

So now, we need to find out how many coins he needed.

And there he is telling us that.

One 10 pence coin, that's the first one.

Two 10 pence coins, three 10 pence coins, four 10 pence coins, five 10 pence coins.

So he needed five coins, didn't he? Well done.

Sofia has 80 p.

She wants to buy the crayons.

So let's see how many of her coins she will need to use.

The crayons cost 60 p.

Each coin has a value of 10 p.

So let's see how many of her coins she needs.

So 10 p.

Each coin has a value of 10 p.

"That means I can count them in tens," says Sofia.

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

Hmm.

What mistake has been made? Hmm, do you agree that she has now got the correct money to pay for crayons? That's right.

She's noticed it herself, hasn't she? She says, "I forgot to stop counting when I reached 60 p." So she should have counted to 60 p and then stopped because that was enough money to buy the crayons, wasn't it? "So when I reached 60 p," she says, "I must then count the number of coins." One 10 pence coin, two 10 pence coins, three 10 pence coins, four 10 pence coins, five 10 pence coins, six 10 pence coins.

So I will need six coins.

So well done if you noticed that as well.

So now it's time to check your understanding again.

Sofia changes the price of the pencil sharpener.

How many 10 p coins would you need to buy the pencil sharpener now? So it costs 40 p now, doesn't it? So would it be, A, four 10 pence coins, B, 40 10 pence coins, or C, five 10 pence coins? So use 10 pence coins to find out.

Pause the video now while you work that out.

Okay, and then let's see how you got on.

So there's the coins that you would need and let's count them.

10 p, 20 p, 30 p, 40 p.

So we can see that you needed how many coins? It was 40 p altogether, but it would be one 10 pence coin, two 10 pence coins, three 10 pence coins, four 10 pence coins.

So it would be four coins that you needed.

So well done if you did that.

Sofia changes some of the items in their Post Office and gives them different prices.

Jun says he can't use only his 10 pence coins to pay for the pencils.

Let's see if he's right.

So the pencils cost 72 p, don't they? Jun says, "When I count in tens, the ones digit is always zero.

I won't say 72." So let's try.

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

Hmm, so we're nearly at 72, but if we put another 10 pence on.

That's right, we'll get to 80 p.

So he was right, wasn't he? He says, "I need to stop counting in tens at 70, and then add two." So actually he could count in tens up to 70 and then he would need 2 p to make 72, wouldn't he? So well done if you noticed that.

So now it's time to check your understanding.

Here are some other items from the Post Office.

Which ones could you buy using only 10 p coins? Okay, so we've got some crayons which cost 60 p.

We've got some felt tips which cost 80 p.

And we have got an eraser which costs 45 p.

So which ones could you pay with using only 10 pence coins? Pause the video now while you try that.

You might want to use some coins to help you.

Okay, and then let's see how you got on.

What did you think? That's right.

60 p can be made with only 10 p coins.

And 80 p can be made with only 10 pence coins.

When you count in tens, the ones digit is always zero, so you will not say 45.

So we know that 45 cannot be paid with completely using 10 pence coins.

Okay, so Sofia wants Jun to give her the correct amount of 10 pence coins to pay for the packet of pencils.

Okay, so the pencils cost 70 p.

As Jun says, "I think I can use my fingers to predict how many I will need.

I will use one finger to represent each 10 p coin.

Then, I will count to 70 in tens and see how many fingers I used." So, 70 p.

So he's got one hand first of all, hasn't he? And he's going to start counting each finger representing one 10 pence coin.

10, 20, 30, 40, 50.

And then he's going to need another hand 'cause he's not at 70 yet, is he? 60, 70.

"I use seven fingers, so I must need seven coins," he says.

And there they are the seven coins that were represented by the fingers.

So well done.

Perhaps you could try buying some different items from the Post Office using your fingers to work out how many coins you would need.

Okay, so now let's check your understanding.

How many 10 p coins would you need to buy the packet of felt tips here? So they cost 80 p.

Count on your fingers to find out, then use coins to check you were right.

So pause the video while you work that out.

Let's see how we did with that.

So there, let's get our one hand first of all and then count in tens.

10, 20, 30, 40, 50.

We're not at 80 yet, are we? So we're going to need our other hand.

60, 70, 80.

So each finger represents one 10 p coin.

I used eight fingers, so I must need eight 10 p coins.

And there they are.

So well done if you did that.

Jun wants to buy the eraser and the pencil sharpener.

Let's see how many 10 p coins he will need to pay for them both.

So the eraser costs 40 p.

So each coin has a value of 10 p.

So I will need.

So we count them in tens.

We know we've got 10, 20, 30, 40 p there.

So I will need four coins.

That's right.

And then the pencil sharpener costs 20 p.

Each coin has a value of 10 pence.

So I will need two coins.

"So in total I needed six coins," says Jun, "to buy the eraser and the pencil sharpener." So, let's have a look at the task for the first part of our lesson then.

Skip count on your fingers to find out how many 10 p coins are needed to pay for each item.

Okay, so each item has a price and you can use your fingers to find out how many 10 p coins you would need to buy that item.

Then, collect the 10 p coins and count them to see if you were right.

Draw the coins and count in tens to check you have the right amount.

So let's see how you got on.

So the eraser was 40 p.

Okay, so if you count on your fingers, 10 p, 20 p, 30 p, 40 p.

You would need four 10 coins, wouldn't you? Okay, then we look at B.

The pencils were 60 pence, weren't they? So weren't they? So you need to count up to 60 pence on your fingers.

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

So that is six 10 pence coins, isn't it? Then the pencil sharpener.

10 p, 20 p, 30 p.

So that's three 10 pence coins.

And then your pencils, that's 90 p.

Oh, so do you think that will be more 10 pence coins, or for you a 10 pence coins than we've had before? That's right.

90 p's nearly 100, isn't it? It will be more coins.

So are you ready? 10 p, 20 p, 30 p, 40 p, 50 p, 60 p, 70 p, 80 p, 90 p.

So it will be nine 10 pence coins.

So well done if you did that.

So, part two of the lesson now.

Solve problems using 10 p coins.

So let's look at our problems. Sofia has these 10 p coins.

She wants to buy a book.

Can she afford it? So we've got a book that costs 70 p here, and there are her coins, and we need to find out if she's got enough money to buy that book.

"So the book costs 70 p, so I will need 70 p or more," says Sofia.

"Each coin has a value of 10 p, so I will count in tens." 10 p, 20 p, 30 p, 40 p, 50 p, 60 p, 70 p.

"I stop counting when I reach 70 p.

I can afford the book.

I need seven of my coins to pay for it." So now it's time to check your understanding.

Jun has six 10 p coins.

How many of his coins will he need to pay for the pen? So you can see he's got some coins there.

So will he need 40 coins, will he need four 10 pence coins, or will he need six 10 pence coins? So pause the video now while you work that out.

And now let's have a look.

So we can see that it should be four coins, shouldn't it? Because if you count in tens, because they're 10 pence coins, you will go 10 p, 20 p, 30 p, 40 p.

So he needed four of his coins.

Well done.

Jun has this money in his piggy bank, okay? So you can see his coins there.

They're 10 pences, aren't they? He wants to buy the pencil.

Does he have enough money? "I will count to see if I have enough," say Jun.

10 p, 20 p, 30 p.

"30 p is less than 60 p.

I need to add some coins." How many more coins does he need? "So I can use a number line to count on from 30 p, but I must remember to count on in tens." So there, there's 30 p, and then he's going to count on.

Each step that he puts on the number line will represent an extra 10 p coin.

So 30 p, and then another 10 pence will be 40 p, 50 p, 60 p.

So he needed another three 10 pence coins, didn't he? So now it's time to check your understanding again.

Who does not have enough coins to buy the eraser? Okay, we can see the eraser costs 40 p, doesn't it? Okay, and then we've got three children there and they've all got a different number of 10 p coins.

So you have a look there and think about who does not have enough coins.

And then think about how many more 10 p coins they need to be able to buy the eraser.

So pause the video now while you try that.

Let's see how you got on.

So did you see that it was Jun there? Let's have a look.

So he's got 10 pence, 20 pence.

So he's only got 20 pence, which is less than 40 pence.

So he needs some more coins, doesn't he? So let's see how many he needs.

So he's already got 20 pence, so we need to count on in tens from 20 pence, don't we? Until we reach 40 pence.

20 pence, 30 pence, 40 pence.

So he needed two more 10 p coins.

Jun had two 10 p coins which had a value of 20 pence, So he would need two more 10 p coins to reach 40 pence.

Well done if you got that.

The children count up their 10 p coins and they have a total value of 60 p.

They put some in Jun's pocket and four coins in Sofia's pocket.

How many coins must be in Jun's pocket? And Sofia's saying, "I will draw a bar model to help me.

So 60 p is the total value of the coins.

It is the whole amount." So that goes there, doesn't it? In that whole amount of the bar model.

And then Jun says, "I can see there are four 10 p coins from Sofia's pocket so that is 40 p.

So 40 is a part.

And there it is.

"60 is the whole and 40 is a part, so the other part must be 20." So we know that the missing part must be 20 p, which we can see is two 10 p coins, isn't it? So well done if you've got that.

So here's the task for the second part of our lesson today.

Okay, so there are some items there and they've all been given a price, and it says draw the extra coins needed to pay for each item.

So there are already some 10 p coins there and you have to draw the extra 10 p coins that will be needed to pay for that item, okay? And as you are working, think about any patterns that you may notice that could help you work more efficiently.

Okay, so pause the video now while you do that.

Now the second part of our task is here.

Sofia puts some of her 10 p coins in her bag.

She tells us the total amount and draws the coins that are in her hand.

So the total amount is the amount in the bag and her hand.

So you need to be thinking about how many are in the bag.

You may think of parts and wholes to help you, or perhaps draw a bar model, and then draw the coins that are in her bag.

And remember, again, look for any patterns that you may spot that could help you.

Pause the video now while you do that.

So let's see how we got on with the first part of our task.

So we have an orange that costs 30 p and we already had two 10 pence coins.

So that's 10, 20 p, isn't it? So we would need, that's right, one more 10 p coin.

And then the pear costs 40, so you would need, that's right, two more 10 p coins.

And then the banana costs 50 p, so you would need three more 10 p coins.

Did you notice a pattern that could have helped you there? That's right, there were already two 10 p coins there to pay for each item, and the prices increased by 10 p each time, didn't they? So only one extra 10 p was needed each time.

So well done if you spotted that.

Okay, now let's look at D.

So we've got here, the cherry is 60 p and we already have four 10 pence coins.

So that's 10 p, 20 p, 30 p, 40 p.

So if you count on from 40 p to 60 p, you will need two more 10 p coins, that's right.

And you may have done that on a number line or you may have used coins.

Okay, and then the apple costs 70 p.

So how many more 10 pence coins will we need? That's right, three more 10 p's.

And then the grapes were 80 p, so that was four more 10 p's.

And did you spot any pattern there? That's right, there were already four 10 p coins there to pay for each item, and the prices increased again by 10 p each time, didn't they? 60 p, 70 p, 80 p.

So only one extra 10 p was needed each time.

So well done if you spotted that.

Okay, so now here's the second part of our task.

And you may if you had drawn a bar model to help you with this and thought about the wholes and the parts.

Okay, so if we look at A, the total value is 30 p.

That's the whole amount.

And we can see two 10 p's, so that's 20 p is a part.

So the other part must be 10 p.

That's right.

And then if you look at B, the total value this time is 40 p and 20 p is a part.

So the other part will be 20 p.

That's right.

And then on C, the total value is 50 p, 20 p is a part.

So the other part must be 30 p.

And on D, the total value is 60 p.

So 20 is a part, the other part must be 40 p.

So you may have used a bar model to help you with that, or you may have used the actual coins.

Did you notice any patterns that could help you work more efficiently? So Sofia had two 10 p coins in her hand each time and the total amount increased by 10 p each time, didn't it? So, each time there must have been 10 p more in the bag to start with.

So well done if you spotted that pattern.

So hopefully you are feeling much more confident about your money work now and also feeling more confident about looking for those patterns and spotting them to help you work more efficiently.

So well done.

So let's have a look at what we've learned in today's lesson.

Skip counting can be used to work out how many 10 p coins are needed to make a given value.

When you reach the value needed, you must stop counting.

The number of 10 p coins needed will be less than the value of the item.

And not all values can be made using only 10 p coins, can they? So well done with our learning today.

You've worked really hard and hopefully you are feeling much more confident about using those 10 p coins to help you to find different values and to count them up.

Well done with that.

You've worked really hard.

I've really enjoyed our lesson.