Comparing numbers up to 50
Hello, and welcome back. Today, we are going to be looking at comparing numbers up to 50. Here’s your get ready task. Can you match up the numbers to the representations, pause the video here and have a go? How did you get on with that? That’s right. Our base 10 shows 23. On number shapes, show 28. And then our bead string is showing 10 red beads and 10 white beets, which altogether is 20. Well done if you got those. Alex and Dexter are playing a game the game’s called Who has more. So they’ve been in collected some number shapes, and now they’re just working out, whose number shape represents more? Can you pause the video here, and I think? Who has more? That’s right. Alex has got two tens. So that represents 20. And Dexter has got a seven and a seven. So we know that Alex has got more. We don’t actually need to work out how many Dexter has, because his seven is less than Alex is 10. So even two sevens aren’t gonna be more than two tens.
Maybe you do know your double (indistinct), and you know that double seven is 14. So Alex has 20, and Dexter has 14. So Alex wins this time. She’s got more. Wow, they’ve been collecting apples this time, and they’ve got lots, haven’t they? But who has more? Pause the video here to have a think. Yes, that’s right. Alex has more. I’m not sure how many she has, but I can tell that she’s got more than Dexter. Ah, I’ll do some quick counting and see. Oh yes, Alex has 20, and Dexter has 12. So we were right. Alex has more because 20 is more than 12, or 20 is greater than 12. So Alex has more. We’re looking at sausages this time. Who has more sausages? Well, Alex has two sausages, and Dexter has three sausages.
Let’s look at that vocabulary. Is two greater than three? Is two equal to three? Or is to less than three? Well, two, certainly isn’t equal to three. We can see that Dexter’s got three sausages, and that’s more, isn’t it? More than two. So let’s get rid of equal to. So hi two greater than three or less than three. That’s right. Two is less than three because having two sausages is less than having three sausages. Oh my gosh. I wonder if they’ve been collecting these octopuses. How are we going to count these octopuses? Let’s put them into groups so I can see a group of five for Alex, and another group of five, so that’s 10. And then one more. So Alex has got 11 octopuses. Can I see a group of five with Dexter? Oh yes. There’s a group of five and another group of five. Five and five makes 10. So Dexter must have 10 octopuses, right? Let’s do this comparison. 11, well, it’s not equal to 10. We know that. Is 11 greater than 10 or less than 10?
That’s right. 11 is greater than 10. Really good comparisons. It’s your turn. Have a go at questions one and two on the worksheet. Eggs this time. And they are rolling everywhere. Oh no. Okay, I’ll just tell you how many aches each child has got. Alex has got 30 eggs, and Dexter has got 30 eggs. Ah, we’ve not had this before. 30 is equal to 30. They both have the same number of eggs. I’ve heard of equal to before. And there’s a mathematical symbol we can use for equal to. It looks like this. 30 = 30. Phew, they’ve put their eggs in boxes this time. So here Alex has 10 eggs, and Dexter has six eggs, right? We’ve got that vocabulary greater than and less than. And we’ve got the mathematical symbol for equal to. There is a mathematical symbol for greater than, and it looks like this. There’s also one for less than, and it looks like this. So it’s 10 equal to six? No, it’s greater than six. So we can read that number. Sentence 10 > 6.
Let’s just have a closer look at our inequality science. So our first one is less than, and then we have more than or greater than, and then we have equal to. Three and then a space for the symbol and then one. So is three more than less than, or equal to one? Well, let’s have a look at a cube representation. So here we have three cubes and one cube. Now we can draw lines around the three cubes in the one cube like this. And we can see that three is greater than one. And the lines have created are greater than symbol. Three is greater than one. What about two and four then? Yes, that’s right. Two is less than four. And we can show that with the cubes. If we’re ever stuck, we can always draw these cubes or go and get some cubes and then draw the lines around them. And we can see this one is making our less than sign. Two cubes are less than four cubes. And then here we have two and two. And again, we can draw the lines around them to show two is equal to two.
Okay, it’s your turn. Have a go at question 3 on the worksheet.
What does Tiny know? Tiny is looking puzzled. You know lots, Tiny. You’ve been listening really carefully all the way through today’s lesson. What’s about the number two, Tiny? You know that two is less than three. Remember those sausages. Two is less than three. Great word, Tiny. And what’s about 11? 11 is more than 10. That was the octopus, wasn’t it? 11 octopuses is more than 10 octopuses. See, you do know some things tiny. 30 tiny. Do you remember? 30 tiny knows that 30 is equal to 30. And he knows there’s a mathematical symbol for that. Great work, Tiny. 10, 10 is more than 6. That was the X, wasn’t it. And you also know the mathematical symbol for more than just looks like this. And if you’re ever not sure, Tiny, you can always draw whatever it is you’re talking about. So with the eggs, you can draw 10 eggs, and you can draw six eggs. And then it’s easy to compare ’cause we can see that 10 eggs is more than 6 eggs. Okay, it’s your turn. Have a go at question four on the worksheet.