Ms.Willer wanted to donate 27 cans of food to 8 food banks. Each of the 23 students in Ms.Willer's class donated 9 cans. How many more cans does Ms.Willer need?
She needs 9 more cans because 27 x 8 is 216 and 23 x 9 is 207 and 216-207 is 9.
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