Video Transcript
Find 18 divided by three using the
cubes shown.
In this question, we need to
practice our skills at dividing by three. And we know that we need to use a
model to help us because we’re given a picture of some cubes. And we’re told that we need to find
the answer using the cubes shown. Now when you see the calculation 18
divided by three, what do you think of? We could think of it as 18 split
into groups of three. And we try to find how many
groups. Or we could think of it as 18
shared into three equal groups. And then we’d be trying to find out
how many in each group. In the picture, we’re given 18
cubes. And you know, it doesn’t really
matter which way we think of 18 divided by three. We can find the answer in both
ways. And both ways involve drawing the
lines on our model.
Let’s start with the first
idea. We could think of this as 18 split
into groups of three. And we’re going to count how many
groups we can make. Perhaps this is the way you’d think
of the division. Well by looking at our cubes, can
you see how to split them into groups of three? If we look carefully, we can see
some groups of three already. We can see one, two, three, four,
five, six groups of three. So if we think of our division like
this, we can split 18 into groups of three and see that we can make six groups. But perhaps you thought of the
model another way. Perhaps you thought of it as 18
shared into three equal groups. Let’s show the model again. And we’re going to draw our lines
in a different way this time.
Can you see how you draw the lines
to share 18 into three equal groups? We could do it like this: one
group, two groups, three groups. And they’re all the same size. We can see that they all contain
one, two, three, four, five, six. So if we start with 18 cubes and we
share them into three equal groups, there’ll be six cubes in each group. So it doesn’t really matter how we
think of this division. Whether we want to find the number
of groups or the number in each group, the answer is still the same. We’ve used a model in two different
ways to find the answer to 18 divided by three. And that answer is six.
