math
posted by Anonymous on .
Help please. Word problems.
Alex has 15 friends. She has 36 chocolate cookies. She wants each friends to have 3 chocolate cookies. how many more cookies does she need?

15 * 3 = 45
45  36 = ? 
thanks!

how did you go about translating?

What do you want to translate?

how did you know it was multiplicaton instead of division or addition

You could add.
First friend = 3 cookies
Second friend = 3 cookies
Third friend = 3 cookies
Fourth friend = 3 cookies
and so on
But it's certainly quicker to multiply the number of friends by the number of cookies each should get. 
great thanks!

You're welcome.