Lesson Video: Sorting Objects into Two Groups | Nagwa Lesson Video: Sorting Objects into Two Groups | Nagwa

# Lesson Video: Sorting Objects into Two Groups Mathematics

In this video, we will learn how to sort real-world objects into two categories based on whether or not they have a given feature.

08:38

### Video Transcript

Sorting Objects into Two Groups

In this video, we’ll learn how to sort objects into two different groups. When we sort objects, we move them around or arrange them so that they appear in different groups, groups that they belong in. How could we sort these objects? Some of these objects are balls. We could sort all the objects that are balls into one group, and then all the objects that are not balls into another group. So, which objects should we sort into our group of balls?

We can see this colourful beach ball. We can see a tennis ball that belongs in this group, too. And we can also see a football. These objects all belong in the group of balls. So, what belongs in the group of objects that are not balls? The carrot is not a ball. Of course, the car isn’t a ball either and nor is the bag. We’ve sorted our objects into two groups, balls and not balls. But you know, sometimes, we can sort the same group of objects in different ways. Let’s have a go at doing that.

Sort these objects in two different ways.

Here, we have some more objects to sort. And this time we’re being asked to sort them in two different ways. Let’s think of one way we could sort them to start with. What does some of our objects have in common? Well, we can see that some of the objects we have here are cars. We could sort them into a group of cars and a group of objects that are not cars. Let’s start by putting all the objects that are cars where they belong. We have a green car, a yellow car, and some red cars. And we can sort them all in the category cars.

Now, we can move the rest of the objects that are not cars into our group that we’re calling not cars. A bicycle is not a car nor is a tennis racket, an apple, or a basketball. They all belong in the category not cars. So, one way we could sort the objects is as cars or not cars. The question asks us to sort the objects in two different ways. How else could we sort these objects? What other things do some of them have in common? Well, we can see that some of these objects have wheels. Perhaps we could sort them into a group of objects with wheels and a group that don’t have wheels.

Or what about colour? Several of these objects are red. What if we sort them into a group of objects that are red and then a group that are not red. The bicycle is red and so is the tennis racket, the apple, the basketball, and some of the cars. We can sort all these objects into our red group. There we go. And which objects are not red? Well, we’re left with the green car and the yellow car. Green and yellow are colours that are not red. So, we can sort these two cars separately. We’ve sorted the same group of objects but in two different ways. First, we sorted them into cars and not cars. But another way we could sort them is into red objects and not-red objects.

Now, let’s practice thinking about the different categories that we can sort objects into.

Which two categories can the objects on these cards be sorted into? Houses and not houses. People and not people. Or books and not books.

We’ve been given some cards here, and they have pictures of objects on them. There is a boy, a girl, a horse, a man, a bag, we have another man, and then this delicious-looking cheese burger on the end. And we need to sort the objects on these cards into two categories. But which two categories can we sort them into? What about houses and not houses? Well, if we look at the objects on the cards, we can’t see any houses at all. This means that if we try to sort out the objects into houses and not houses, we can’t do it. All of the objects are not houses. The first answer can’t be right. What about our second answer? Can we sort the objects into the categories people and not people?

Well, we can see some people on our cards. We could sort the boy, the girl, and both of the men into a group called people. This means that the horse, the bag, and the cheese burger all belong in the category not people. It looks like these two categories might be the answer we’re looking for. But let’s look at our final two categories just to check. Can we sort the objects into books and not books? No, none of the objects on the cards are books. So, if we try to sort the objects into books and not books, we’re not going to get very far. The correct two categories that the objects on the cards can be sorted into are people and not people.

Now, let’s try a problem where we have to do some sorting of our own.

Natalie wants to group these animals into pets and not pets. Which animals belong in the pets group?

We’re told that Natalie wants to sort out these animals into two groups or two categories, pets and not pets. And the question asks us which animals belong in the pets group. Let’s go through each animal and sort them out just like Natalie would do. Our first animal is a dog. Does a dog belong in the pets group or the not-pets group? Well, lots of people keep dogs as pets. You may even have a dog yourself. We often see people walking their pet dogs in the park. The dog belongs in the pets group. Where does our friend the giraffe belong? Is it a pet or not a pet?

Well, if we were going to keep a giraffe as a pet, we’d have to have a very tall house. Of course, we know a giraffe is a wild animal. It belongs in the not-pets group. Although our next animal looks friendly enough in the picture, we know that having a lion as a pet is not a very sensible idea. Just like the giraffe, a lion is a wild animal. The lion belongs in the not-pets group. Finally, we have a cat. We know, just like dogs, a lot of people have cats as pets. Our cat belongs in the pets group. And so, we can say if Natalie groups these animals into pets and not pets, the animals that belong in the pets group will be a dog and a cat.

What have we learned in this video? We’ve learned that we can sort objects into two groups. And we can do this by looking for things that they have in common. Remember when we sorted out all the balls or when we grouped together all the objects that were red. We’ve also learned that we can take the same group of objects, but we can sort them in different ways.

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