Video Transcript
Comparing Groups of Objects: More
Than
In this video, we’re going to learn
how to compare two groups of up to five objects to see which has more objects. And the way we’re going to do this
is using a matching strategy. In this picture, we can see some
monsters. We have a group of orange monsters
and a group of one-eyed green monsters. But which type of monster is there
more of, the orange monsters or the green monsters?
To find the answer, we need to
compare the groups. And we’re going to be using words
like “more” as we go through this video. Two more useful words are “greater”
— we could say that a group is greater than another group — and another useful word
we’ll be using is “larger.” All these words mean roughly the
same thing. So how can we find out which group
of monsters is greater or larger?
Well, we can see in the picture
that the monsters in each line are equally spaced. This means that we can match them
up, one orange monster with one green monster, and so on. Let’s count aloud as we do
this. One, two, three, four. So we can definitely match up four
pairs of monsters. But we’ve got some green monsters
left over. There aren’t enough orange monsters
to match with them. So what does this tell us about the
groups? We can say there are more green
monsters than orange monsters. The group of green monsters is
larger.
In this picture, we’ve got two more
groups of monsters. There are some pink monsters and a
group of blue monsters. But let’s compare the size of each
group. Are there more pink monsters or
more blue monsters? Well, we can see unfortunately this
time the monsters are not arranged neatly in two lines. Now they do look friendly, so we
could politely ask them to line up and space themselves out equally. But is there another way to find
the answer by using matching?
Well, when we have a picture of
objects like this and we can’t move them, we can use maths equipment to help. To start with, let’s put a pink
counter next to each of the pink monsters, one counter for one monster. There we go. Now we can move our counters and
make a line of them. Let’s count as we do so. There are one, two, three, four
pink counters. And that makes four pink
monsters.
Let’s do the same with the group of
blue monsters, one blue counter for each monster. Now let’s make a line of them. And we’ll match them up to our pink
counters, one at a time. One, two, three, four. Now we’ve matched up all the pink
counters with blue counters, but we’ve still got another blue counter to go,
five.
Now if we compare our two lines of
counters, we can see that our line of blue counters is longer than our line of pink
counters. This tells us that there are more
blue monsters than pink monsters. There’s a greater number of blue
monsters. It’s a larger group.
Now let’s use this matching
strategy and some of these words as we compare some other groups of objects.
Are there more drumsticks than
drums?
In the picture, we can see a
row of drumsticks. And above them, there’s a row
of drums. Our question asks us to compare
these two groups of objects. Are there more drumsticks than
drums? We can see that the way that
the objects have been spaced out, we can match each drumstick with a drum. One, two, three. But we can’t match up our final
drumstick. There aren’t enough drums. This drumstick is left over
after we’ve matched the drumsticks with the drums. And so we can say that there
are more drumsticks than drums. The answer to our question is
yes.
Are there more balls or more
rackets?
In the picture, we can see a
row of tennis balls. And above them is a row of
tennis rackets. The question is asking us to
compare these two groups of objects together. Which is greater? Are there more balls or are
there more rackets? Sometimes when objects have
been arranged in a line, we can compare the lines and see which is longer. If we do this, we can see that
the line of tennis rackets is longer than the line of balls. Does this mean there are more
rackets?
Well, no it doesn’t because a
tennis racket is longer than a tennis ball. And the way our lines of
objects have been made are not equally spaced. But you know we can still
compare the groups by matching each ball with a racket. One, two, three. But we don’t have a racket to
match the last ball to. This means there must be more
balls than rackets. The group of balls is larger
than the group of rackets. So are there more balls or more
rackets? There are more balls.
Jennifer has two bags of
marbles. Which bag has more marbles than
the other?
In the picture, we can see the
two bags of marbles that Jennifer has. They’re labeled bag A and bag
B. We need to compare bag A with
bag B because we’re asked which bag has more marbles than the other. Which bag contains a larger
group of marbles?
Now the way these marbles have
been drawn, it could be quite difficult to match them up. Let’s use counters to help
us. First, we’ll count the marbles
in bag A. And we’re going to use one
counter for each marble that we count. One, two, three, four,
five. There are five marbles in bag
A. What about bag B? There are one, two, three
marbles in bag B.
Now we can compare the two
heights of the towers of counters that we’ve made. Tower A is taller than tower
B. So we know there must be more
counters in it. And we also know there must be
more marbles in bag A than bag B. And so, out of Jennifer’s two
bags of marbles, the bag that has more marbles than the other is bag A.
Complete the following. There are more what than
dogs?
We’re shown a picture that
shows three groups of animals, all jumbled up. There’s a group of cats, a
group of dogs, and a group of ducks. And the question asks us to
compare these groups together. We need to complete the
sentence. There are more what than
dogs? So to find the answer, we need
to compare the number of cats with dogs and also the number of ducks with
dogs.
One of these groups of animals
will be larger than the group of dogs. But which one? Now this is a picture of cats
and dogs and ducks, and we can’t move them and put them in a line to compare
them or match them up. But what we could do is use
maths equipment to help us.
First of all, let’s model the
number of dogs that there are by using cubes. We can start off by putting a
cube next to each dog, one cube for one dog. Now let’s put all our cubes
together, and we’ll count them as we do this. One, two, three. There are three dogs. Now let’s compare the ducks
with the dogs. Are there more ducks than
dogs? First, we can match one cube
with one duck. Now let’s count them. One, two. There are two ducks in the
picture.
Now if we compare our two lines
of cubes, we can see that there are more dogs than ducks. So can we say that there are
more ducks than dogs? No we can’t. Let’s try the cats, a cube for
each cat to help us model how many there are. Now let’s count them. One, two, three, four. There are four cats.
Let’s compare then the number
of cats to dogs. Can we say that there are more
cats than dogs? Yes, we can. We can see that the line of
cubes that we’ve made is longer for cats than it is for dogs. And we can also see this in the
picture. If we match up one cat with one
dog, we’ve got an extra cat left over. There are more cats than
dogs.
So what have we learned in this
video? Firstly, we’ve learned to compare
groups of objects together. And the way that we’ve done this is
by using matching strategies. We’ve matched the objects up to see
whether we have any left over. And secondly, we’ve used words like
“more,” “larger,” and “greater” to say which group has more objects.
