Question Video: Counting and Modeling the Number 10

Count the rats. Find a piece of cheese for every rat.

02:41

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.