Video Transcript
Count the rats. Find a piece of cheese for every
rat.
In this question, we’re shown some
rats. And we’re asked to find a piece of
cheese for every rat. This question is asking us to match
the number of rats with the same number of pieces of cheese. First, we’re going to need to count
the number of rats. One, two, three, four, five, six,
seven, eight, nine, 10. If there are 10 rats, then we need
10 pieces of cheese.
Which of our three groups have 10
pieces of cheese? To help us find a piece of cheese
for each rat, we could place the rats in a line. Then, we can try and match a piece
of cheese to each rat. Let’s start with the first
group. One, two, three, four, five, six,
seven, eight. We don’t have a piece of cheese for
every rat.
Let’s try the second group. If we give a piece of cheese to
each rat like before, we can see that there are not enough pieces in this group. One rat doesn’t have a piece of
cheese. If there are 10 rats and one rat
doesn’t have a piece of cheese, how many pieces of cheese are there? One less than 10 is nine.
We’re looking for 10 pieces of
cheese because there are 10 rats. So, this must be the group that has
10 pieces of cheese. Let’s check. One, two, three, four, five, six,
seven, eight, nine, 10. This is the group that has 10
pieces of cheese. We found a piece of cheese for
every rat. There are 10 rats and 10 pieces of
cheese.
