### Video Transcript

Comparing Groups by Counting Up to
20.

In this video, we’re going to learn
how to compare groups of up to 20 objects. We’re going to do this in lots of
different ways, including splitting a number up into a group of 10 and some more
ones. Do you have a sticker chart at
school or maybe home for good work or good behavior? Here’s a reward chart for two
children.

Now let’s imagine that each time
these children get a star for good behavior or good work, they don’t really worry
about where to put it. They just stick it somewhere in the
box, next to their face. So can you see? We’ve got two groups of stars here:
one green and one blue. Which group contains more
stickers?

We need to compare these two groups
to find out. One way we could compare the
stickers is by lining them up. This is why sometimes on a reward
chart, you see little boxes where you have to stick the next star in. It makes things a lot easier to
count and compare. Now, if we’re going to do this, we
need to make sure that each sticker is level with each other. Can you see how the first green
star is level with the first blue star and the second green star is lined up with
the second blue star? And because we’ve lined up all of
the stickers like this, it makes it much easier to compare them. Which group contains most
stickers? And how do we know?

Well, because all of the stickers
are the same size and we’ve made sure to line them all up, we can say that the group
that has the most stickers is going to be the one that makes the longest line, isn’t
it? We don’t even need to count them,
do we? We can answer this question just by
comparing the lines that we’ve made. The blue stickers make the longest
line, don’t they? And so we can say there are more
blue stickers than green stickers.

We can even say how many more. We’ve matched up all of the green
stars with a blue star. But we can count one, two blue
stars left over. There are two more blue stars than
green stars.

This is an interesting reward
chart, isn’t it? Instead of stickers, every time the
children have received a reward, they’ve drawn a smiley face. But this means we can’t peel them
off and put them in a line this time to compare them. How could we find out which group
is largest this time? Perhaps what we could do is count
them. And so that we remember which
smiley faces we’ve counted, let’s cross them off as we say each number.

How many rewards has the girl
received? We can see one, two, three, four,
five, six, seven, eight, nine, 10, 11, 12, 13. Let’s make a note of that number
because we might forget it. Do you remember how to write the
number 13? It’s a one followed by a three. The girl has 13 rewards. Now let’s count the boy’s
rewards. How many smiley faces has he
got? One, two, three, four, five, six,
seven, eight, nine, 10, 11, 12, 13.

Now we can see we’ve already got to
the same number as the girl, and the boy still has one more smiley face to
count. So we know that the boy has one
more reward, doesn’t he? And one more than 13 is 14. We found out who has more rewards
by counting them. The boy has one more reward.

Let’s try one more way of comparing
groups. This time, we’ve got a group of
pink stickers and a group of orange stickers. We could put them all in a line and
match them and see which line is longest. Oh, we’ve already done that. Or we could count both groups and
see which group is the larger number. But we’ve already done that
too. Let’s try using some ten
frames. We could arrange our stickers so
that they fit in ten frames, just like we’d use counters, first the pink stars and
then the orange.

Now it’s become a little bit easier
to see which group is larger. To begin with, can you see that
both groups of stickers have filled up one ten frame completely? And we know that a ten frame holds
10. That’s why it’s called a ten frame
and not an eight frame or a nine frame. So both groups are the same so
far. They’ve got one full ten frame. But both groups show some more
ones.

Now, because both the ten frames
are exactly the same, should we just look at the ones and compare those? That might be quicker, mightn’t
it? So with the pink stickers, we have
a group of 10 and then one, two, three, four, five, six, seven, eight more ones. The orange stars also have a group
of 10, but they have one, two, three, four, five more ones. Now, which is larger, eight more
ones or five more ones? We know that eight is larger than
five, don’t we? So we can say that the group of
pink stars is greater than the group of orange stars.

Now, we can say this another way if
we start by thinking about our orange stars first. There are fewer orange stars than
pink stars. We could even say how many
fewer. So that our two lots of ten frames
look exactly the same, we would need to show another one, two, three more orange
stars, five, six, seven, eight. So let’s put a number into that
last sentence. There are three fewer orange stars
than pink stars.

Let’s try answering some questions
now where we have to compare groups of objects. And perhaps we’ll try some of these
different ways we’ve looked at.

Who has fewer stamps, Mason Or
Madison?

Looks like both these children have
been collecting stamps, doesn’t it? Because we can see two groups. Mason has been collecting blue
stamps, and Madison has a collection of purple stamps. And our question asks us, who has
fewer stamps? In other words, which group is
smaller, Mason’s group or Madison’s group?

Now, there are some things the same
about these groups of stamps. Can you spot what they are? Firstly, we can see that all the
stamps are the same size. This might help us compare the
groups. And there’s also something
interesting about the way these stamps have been arranged. We can see a longer line of stamps
and then a shorter one in both groups. We can also see that the stamps in
the groups have been lined up.

Let’s just count how many stamps
there are in the first long line. One, two, three, four. Can you see how all these stamps
are lined up with each other? Makes it a lot easier to compare
them, doesn’t it? Five, six, seven, eight, nine,
10. Did you guess that each group had a
row of 10 on the top? So we can see a row of 10 but then
some more. How many more blue stamps are
there? There are one, two more than
10. And how many more purple
stamps? One, two. This is now the same as the blue
stamps, isn’t it? But look, we’ve got some more to
count. Three, four, five, six more than
10. I think we know who has fewer
stamps, don’t we?

Both groups of stamps show a row of
10 and then some more. Mason has two more than 10, but
Madison has six more than 10. So we can see there are less blue
stamps than purple stamps. The person who has fewer stamps is
Mason.

Olivia is counting beads on a
string. Complete using more than, less
than, or equal to. The number of blue beads is what
the number of red beads.

This question is all about
comparing two groups together. Can you see the two groups of
objects that we’re looking at? It’s the beads that are on this
string. There are a group of blue beads and
a group of red beads. And we need to compare the group of
blue beads with the group of red beads because we’re given a sentence to complete:
the number of blue beads is what the number of red beads. Is it more than the number of red
beads? Is it less than the number of red
beads? Or are the two groups the same? Is the number of blue beads equal
to the number of red beads?

Perhaps if these were objects in
real life, maybe beads or counters, we could compare them by matching them up. But in this question, this is just
a picture of the objects. So how can we compare these
groups? Let’s count them. How many blue beads can we see? One, two, three, four, five, six,
seven, eight, nine, 10, 11, 12. The group of blue beads contains 12
beads. And the group of red beads contains
one, two, three, four, five, six, seven, eight, nine, 10, 11, 12. This is interesting. We counted 12 blue beads but also
12 red beads. These groups are exactly the same
size.

So are we going to use more than,
less than, or equal to to compare our groups? Well, we know that the word “equal”
means the “same as.” Both groups contain 12 beads. And so we can say the number of
blue beads is equal to the number of red beads. Our missing words are “equal
to.”

Use greater than, less than, or
equal to to complete the sentence.

This is an interesting sentence
because it’s made up of pictures, a word, and a gap. Let’s try and read it. This group of smiley stickers is
what this group of smiley stickers. Can you see what we need to do
here? We need to compare these two
groups. And we’re given some ways to
complete this sentence.

Perhaps there are more stickers in
the first group, in which case we need to use the words greater than and use this
symbol. Or maybe the first group is the
smaller group, and we need to say that it’s less than the second group. Or maybe both groups are exactly
the same, in which case we need to use the words “equal to.”

Now, just by looking at these two
groups without doing anything else, can you have a guess? Do you think the first group is
larger, smaller, or do you think they’re both the same? The only way we’re going to find
out really is by counting these groups. Let’s try counting them at the same
time. As we count each sticker, we can
cross them off. One, two, three, four, five, six,
seven, eight, nine, 10, 11, 12, 13, 14, 15.

We could stop here, couldn’t
we? Because we’ve run out of stickers
in the second group. There must be 15 stickers in this
group. Do you remember how to write the
number 15? It’s a one followed by a five. There are 15 stickers in the second
group. But we can see some more stickers
in the first group that we haven’t counted yet. We can see now that the first group
is bigger. There are two more stickers in the
first group than the second group, aren’t there? Should we count on from 15? 15, 16, 17.

We found that the first group is
larger than the second group. And so we know which words to
complete this sentence with. 17 is greater than 15. The first group is greater than the
second group. The words that we need to complete
this sentence with are “greater than.”

So what have we learned in this
video? We’ve learned how to compare two
groups of objects. We’ve used counting. We’ve lined the objects up to
compare them. And we’ve also split the objects up
into a group of 10 and some more ones.