Video: Writing Addition Equations with an Unknown for Word Problems Involving Numbers up to 20

Scarlett had 11 toy cars. She was then given some toy boats. In total, she had 15 toy vehicles. Write an addition sentence that shows this using “?” for the number of boats.

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Video Transcript

Scarlett had 11 toy cars. She was then given some toy boats. In total, she had 15 toy vehicles. Write an addition sentence that shows this using a question mark for the number of boats.

We know that Scarlett has a total of 15 toy vehicles. We know that 11 of Scarlet’s toy vehicles are cars. Scarlett was given some more toys which were boats. But we don’t know how many boats she was given. We have to write an addition sentence which shows the number of vehicles Scarlett had. We know that Scarlett had some cars and some boats and a total number of toy vehicles. She had 11 toy cars and plus some boats. And we’re told to use a question mark for the number of boats. And we know that altogether Scarlett had 15 toy vehicles. So our number sentence is 11 plus question mark equals 15. We wrote an addition sentence using a question mark for the number of boats. 11 plus question mark equals 15.

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