# 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 = ?