### Video Transcript

Which addition sentence is equal to seven plus eight? Is it seven plus seven plus one, seven plus seven plus seven, eight plus eight plus one, 13 plus one, or seven plus eight plus one?

Let’s start by testing whether seven plus seven plus one is equal to seven plus eight. Both addition sentences begin with seven. So far this is correct.

Is seven plus one equal to eight? Seven plus one equals eight. The addition sentence which is equal to seven plus eight is seven plus seven plus one.