Video: Writing Repeated Addition Expressions Matching Arrays

Jacob and Emma are counting the number of basketballs. Emma says that there are 4 + 4 basketballs. Jacob says there is another way to count the basketballs. What is it? [A] 2 + 2 + 2 + 2 [B] 2 + 2 + 2 [C] 1 + 1 + 1 + 1 [D] 1 + 1 + 1 [E] 2 + 2

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Video Transcript

Jacob and Emma are counting the number of basketballs. Emma says that there are four plus four basketballs. Jacob says that there is another way to count the basketballs. What is it? Two plus two plus two plus two, two plus two plus two, one plus one plus one plus one, one plus one plus one, or two plus two.

We know that Jacob and Emma are counting the basketballs. And Emma says that there are four plus four basketballs. Emma is right. We can group the basketballs into two groups of four or four plus four. Jacob says there’s another way we can count the basketballs. We have to decide what it is. Which of these addition sentences or expressions can be used to count the basketballs? Two plus two plus two plus two. Can we group the basketballs into four groups of two? Yes, we can. We can count the basketballs in twos. Two plus two plus two plus two.

We know that two plus two plus two is not correct. We already know there are four groups of two. This expression only has three groups of two or three twos. If we group the basketballs in ones, there would be eight ones. So one plus one plus one plus one is not correct. Neither is one plus one plus one. There would be eight ones, not three. And we know the last expression is also incorrect. There are four twos. Emma said that there are four plus four basketballs. And Jacob said that there’s another way to count the basketballs. It is two plus two plus two plus two.

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