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Multiplying fractions word problem: movies

Sal solves a multiplication fraction word problem about movies. Created by Sal Khan.

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• How does Sal write that neat?!
• He's using a digital pencil not a mouse
• yeah I got confused by what he said that 13/4 is the same thing as 1x3/4! And now he saying that!
• 21/4 beacuse he add all of them i am not sure plz help thanks i am dum i am sorry
• That's because 5 is a factor of 20. Waffles the great.
• Can somebody help me with this problem?

Joe has a recipe that requires 3 and 1/2 cups of flour. He wants to reduce the recipe by 1/2 cup. How many cups of flour are needed for the smaller recipe?
• do u do the same thing with decimals ? :)
• The blue fill up bar on the video play sign isn't filling up! Please fix this problem.
• There is a bug. A lot of people have been having this issue for months.