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

Amelia made 12 sandwiches for a picnic. At the end of the day, there were 5 left. Write a subtraction sentence that shows this using “?” for the number of sandwiches that were eaten. [A] 12 − ? = 5 [B] ? − 5 = 12 [C] 7 − 5 = ? [D] 12 − 7 = ? [E] 5 − 7 = ?

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Video Transcript

Amelia made 12 sandwiches for a picnic. At the end of the day, there were five left. Write a subtraction sentence that shows this using the question mark for the number of sandwiches that were eaten.

We know that Amelia had 12 sandwiches to begin with. We know some were eaten because at the end of the day there were five left. We can use the question mark to show the number of sandwiches that were eaten.

So this is the correct number sentence. Amelia had 12 sandwiches. Some were eaten. And there were five left.

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