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Division of Fractions Image Description 3

Frank and Sally solved their problems differently but got the same answer. Why do they both work? Can you use either method any time? Why or why not? 

There are 2 boxes of equations. The top box has 15/16÷3/4=5/4, I got this by dividing across. 

The bottom box has: 15/16÷3/4=15/16x4/3=5/4