Objective - To use proportions to solve problems. If it takes 8 cups of flour to make 48 cookies, how many cookies can be made with 12 cups? Let x = the.

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Presentation transcript:

Objective - To use proportions to solve problems. If it takes 8 cups of flour to make 48 cookies, how many cookies can be made with 12 cups? Let x = the number of cookies cups cookies 8 48 = 12 x 8x = x = 72 cookies

x 20’ 5’ 6’ Correct Proportions Incorrect Proportions

Peter can read 150 pages in 12 days. How many pages can he read in 20 days? Let p = the # of pages pages days = p = 12p 12 p = 250 pages 150(20) = 12p 250 = p

Proportions are similar to analogies. Pen Paper = x Computer x =Keyboard Arm Throw = Leg x x =Kick Car Garage = Wallet x x =Pocket Money x =

A printer can print 120 books in 6 hours. How many books can it print in 8 hours? Let x = the number of books books hours = x = 6x 6 x = 160 books 120(8) = 6x 160 = x

You are able to paint 5 rooms in 2 days. How many days will it take you to paint a 32 room mansion? Let d = days needed to paint mansion rooms days 5 2 = 32 d 5d = 64 5 d = 12.8 days d = 64 5

A recipe for 20 pancakes calls for 3 tablespoons of butter. How many tablespoons are needed for 35 rolls? Let t = the # of tablespoons of butter tablespoons rolls 3 20 = t = 20t 20 t = 5.25 tablespoons 3(35) = 20t 5.25 = t