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.
