Adding or subtracting Zero

Key Stage 1

Maths

Addition and Subtraction

﻿Hi, I am Mrs Walgen and today I'm going to teach you your math lesson. Okay. So I know that last lesson you were given this practise activity. And I also know that you were asked to use a part, part, whole model. So let's have a look at the questions together. There are nine children, six of them have scooters. How many of them don't have scooters? So I drew on my part, part, whole model to help me. Let's just have a look at it. What does the nine represent? That's right. Nine is the whole so how many children there are all together? What about the six? What does the six represent? That's right. It's a part of our part, part whole. And it's actually representing how many children have scooters. So what does this part represents? That's right. That represents how many children don't have scooters. So how are we going to do this? How are we going to find out how many children don't have scooters? We're going to split nine into our two parts. We've split it into six already because that's how many children have scooters and what number is going to go into our other part. That's right. Three, three is going to be our other part and three represents the number of children that don't have scooters. So we know now that we have nine children altogether, six of them have scooters. And three of them don't have scooters. And when you add six and three together, they create the total nine. They make the total nine. All right, let's just have a look at the equation here. Nine subtract six. So again, nine is our home. We know that six children have scooters, and that will leave us with the total number of children that don't have scooters. So what's the amount of children that don't have scooters. How many don't have scooters? That's right. Three of them don't have scooters. Let's have a look at the second one. I need five metres of fabric to make some costumes. I need three metres of fabric to make some curtains. How much fabric do I need all together? So we've got five and we've got three but we need to know how much we need all together. So how much fabric do I need altogether? So I know that I need to do five add three and it gives me a total of eight. Super! So I would put eight as my home. And again, I can complete my missing number equation. Five add three equals eight. Okay. Super. Okay. Let's have a look at today's math lesson. Alright. Have a look at this picture. I want you to tell me what is it that you can see? What do you notice about this picture? We've got a bus. How many people are on that bus? That's right. That's four people on the bus. So four people are sat on the bus. Let's see what happens when the bus gets to the next bus stop. What do you notice now? How many people are on the bus? We've still got four on the bus but what about those people that stood next to the bus? We got three people. Okay. So they're going to get on our bus. They're going to join our bus. So how many people do we have on the bus now? That's right. We've got seven. Okay. So first let's go back to the beginning. First, there were four people on the bus. Then the bus stopped and three more people got on. Now, we have seven people on our bus And we can write an equation that looks just like this. First we've got four people. Then three people got on So four add three. Now it's seven. So first there was four people on the bus, three more got on. So that means there are seven people seven children all together on the bus. So four add three equals seven. Fabulous. So let's have a look at this one. Let's do it again. What'd you notice about this bus? That's right. We've got six people on the bus this time. Okay. So it's driving along the road and it stops off at the bus stop. And what do you notice now? There's nobody there. There's nobody waiting. Okay. So then the bus drives up. What do you notice now? What do you notice now about the bus? Yeah. There're still six people on the bus. So let's talk through it again. Six children are on the bus. It stops off at the bus stop and zero children gets on. Nobody gets on. There's nobody there waiting. So how many children are there now? The six children are on the bus. And that's because, nobody got on the bus. We haven't added anybody onto our bus. So should we see what it looks like as we write an equation. So, first of all, we started with six children. Then we added zero because there was nobody there at the bus stop. And there's still six children on the bus. And do you know why that is? Because when zero is added to a number, the number stays the same. The number remains the same. So if we have six to begin with and we add zero then we going to still have six. Because zero is nothing. Oh, should we have a look at that as an equation? Six add zero equals six. Can you say that number sentence for me? Fabulous. And we've got to remember that when zero is added to a number, the number remains the same. It stays the same. Wow. That's magic. Okay. So let's have a look at another example. So first, how many children are on our bus? That's right. We've got five children on our bus. So the bus starts driving along the road and it gets to a bus stop. What do you notice now? How many children are getting on the bus. There's nobody there at the bus stop. So how many children gets on our bus? Zero, see zero again, isn't it? So what happens, the bus carries on driving. How many people are on our bus now? Five, so first, we started with five children. Then zero children got on, nobody got on and now there's still five children on the bus. Can you remember why, there are still five children on the bus ? That's right. Because when we add zero to a number, the number remains unchanged. It doesn't change. Does it stay the same? So let's have a look at the equation. We have five children on the bus, then nobody gets on. So there is our zero, five add zero. And now we've got five children, five add zero equals five. Well done you. Superb. Okay. I thought we would've a little bit of a sing song because we've been looking at zero. Now some of you might remember that, in number blocks, we have zero the hero. So let's get our singing voices ready. And let's sing to zero the hero. Okay. ♪ When there are never tankers in the bay ♪ ♪ You've got zero ♪ ♪ When all the birds have upped and flown away ♪ ♪ You've got zero ♪ ♪ When you've eaten all the cupcakes ♪ ♪ When you've drunk up all the milkshakes ♪ ♪ You've got no cakes no shakes ♪ ♪ You've got zero ♪ ♪ When all the sweets have vanished from the jar ♪ ♪ You've got zero ♪ ♪ When all the wheels have fallen off your car ♪ ♪ You've got zero ♪ ♪ When the wind blows down the beach huts ♪ ♪ And you've broken all the teacups ♪ ♪ You've got no huts no cups ♪ ♪ You've got zero ♪ ♪ I'm the number for nothing ♪ ♪ I'm one less than one ♪ ♪ When there's nothing of something ♪ ♪ I'm the number for none ♪ ♪ When there's nothing there to count ♪ ♪ None is the amount ♪ ♪ You've got zero ♪

Right, We've got a bus. How many people are on the bus? Zero. So there're zero people on our bus and the bus drives along and it stops up at the bus stop. How many people are at the bus stop ready to get on our bus? I think we've got three ready to get on. The bus drives off. How many are on the bus now? That's right. We've got three on the bus. So let's have a look at the numbers First, we have zero then we had add three so three people got on and now we've got three people on the bus. And an equation is zero add three equals three. And it doesn't matter whether zero is the first addend, or the second addend. Because when you add zero to a number, the number remains unchanged. We really good now adding zero to numbers. So I want you to fill in the missing numbers below. And I want you to pause the video to do this. I don't want you to rush it. I want you to take your time. And if you need to draw pictures of buses to help you then do that. But I want you to remember our really special sentence for today. And that's when you add zero to a number, the number remains unchanged. We're really good at adding zero to a number. So I'm going to ask you now to look at subtracting zero from a number. I want you to have a look at this picture I want you to tell me what do you notice? That's right. We've got a basket. We've got some eggs. How many eggs are in the basket? There are six eggs in the basket. Oh oh, what's happened now? So how many eggs do we have on the floor? We've got three eggs that are cracked on the floor. And how many is in the basket? Three. So we have six eggs in the basket. Then we walked along and dropped how many eggs? Three eggs. Oh no. So how many is left? We've got three eggs left in our basket. Let's have a look at the numbers. So first, we had six eggs in our basket unfortunately we tripped upon, three eggs fell out. So we only have three eggs in our basket. So we're subtracting now. Okay. And the equation to go with this picture is six, subtract three equals three. Right? Harry, my friend, Harry has a basket. And how many eggs does he have in his basket? He's got six eggs in his basket. Oh, I hope Harry is better than I am and doesn't trip up. Shall we see what happens next? Lucky for us. Has Harry dropped any eggs? How many eggs are in the basket now? We've still got six eggs. So has he dropped any? So he's dropped zero eggs. Phew! Now we've got six eggs. So first, Harry had six eggs in his basket. He didn't drop any, so we subtract zero, because he didn't drop any. And now he still has six eggs in his basket. And the equation is, six subtract zero equals six. And just like when we add zero to a number, the number remains unchanged. Well, when we subtract zero from a number, the number remains unchanged. So six subtract zero equals six. Okay. What do you notice now? That's fine, we don't have eggs and we don't have a basket. What do we have instead? We have flowers. How many flowers do we have? We have three flowers and we've got a purple vase. Okay. Right. So first, you've got three flowers. I hope none of them are taken away. Shall we check? So we still have three flowers. So none have been taken away. We've got zero flowers taken away. So, we now have three flowers. So we have three flowers zero were taken away, zero flowers were taken away and now we still have three flowers. And the equation is three subtract zero equals fabulous, equals three. And that's because when we subtract zero from a number, the number remains unchanged. Fabulous. It's like magic for maths, isn't it? Okay, We're super, super, super clever. And we're really good at this. And because we are really good just like we did with adding zero, we're going to fill in the missing numbers for subtracting zero. And again, you might want to pause the video, and you might want to draw pictures to help you just like we have do with the eggs and the flowers. But I want you to remember our really important sentence. And that is when you subtract zero from a number, the number remains unchanged and that sentence will help you when you are filling out these missing numbers. Wow. We've got to the end of the lesson all ready. That was really quick. So your practise activity for next time is, to complete the part, part whole models and the missing number equations at the bottom. And I want you to remember that when you add zero to a number, the number remains unchanged. And when you subtract zero from a number, the number remains unchanged. So today we've looked at adding zero and subtracting zero and that's what you're going to do with your practise activity. You're going to look at the numbers and you're going to either add or subtract zero either to the number or from the number. Well, I've really enjoyed teaching you today. And I hope that you have a fabulous time completing the practise activity. Bye!

Adding or subtracting Zero

Adding or subtracting Zero

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UnitMaths / Addition and Subtraction

Maths