Video: Subtracting One-Digit Numbers Using a Related Addition Sentence to Solve Word Problems

Chloe and Daniel made 6 cupcakes. After their dog ate some, there were 2 left. They want to know how many cupcakes their dog ate. Who is correct? Chloe says: We can solve 2 + _ = 6 Daniel says: We can solve 6 − 2 = _

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Video Transcript

Chloe and Daniel made six cupcakes. After their dog ate some, there were two left. They want to know how many cupcakes their dog ate. Who is correct? Chloe says: We can solve two plus what equals six. Daniel says: We can solve six take away two equals what.

We know that Chloe and Daniel had six cupcakes to begin with. We can model this using six counters in a 10 frame. We also know that after their dog ate some, there were two cupcakes left, so we know that one of the parts in our part–whole model is the number two. They had six cupcakes. Their dog ate some. And they have two left. Chloe says we can solve two plus what equals six. If we know that two plus four makes six, Chloe must be correct. And if we look at our 10 frame, we can see that there are two counters and four counters have been crossed out, but there are six counters altogether. Two and four are a pair of numbers which go together to make six. So Chloe is correct.

Daniel said we could solve six take away two. He’s also correct. If two plus four equals six and six take away two equals four, addition and subtraction are related. So if Chloe and Daniel made six cupcakes, their dog ate some, and they had two left, they can work out how many cupcakes their dog ate by either solving two plus four equals six or six take away two equals four. They’re both correct.

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