Video: Matching Similar or Equal Sets

Count the red cubes. Which set of cubes has the same number as set A?

02:29

Video Transcript

Count the red cubes. Which set of cubes has the same number as set A?

In the first picture, we can see a line of red cubes, and they’re labelled set A. We’re asked to count the red cubes. How many are there? One, two, three, four, five, six, seven. There are seven red cubes. Now, we’re given three more sets of cubes to look at, this time they’re yellow cubes. And we’re asked, which set of cubes has the same number as set A? Well, if we look at our cubes, they look different.

For a start, they’re not red; they’re yellow. And they’re not in a line. They’re all jumbled up. None of them look the same as set A. But we know different arrangements of objects can still show the same number. Let’s count our sets of yellow cubes until we find one that has seven cubes just like the red. Let’s count the first set to begin with. One, two, three, four, five, six, seven, eight. We’re looking for a set of seven cubes. So, this answer is not right.

Let’s count our second set. One, two, three, four, five, six, seven. This set of cubes has the same number as set A. Let’s count the final set just to check. One, two, three, four, five, six, seven — oh this is going to be more than seven — eight, nine. We counted seven red cubes. And we know that it doesn’t matter how cubes are arranged or even what color they are. We can still show the same number in a different way. And so, the set of yellow cubes that has the same number as set A is the one that contains seven cubes.