nina science class lasts 5/6 of an hour. only 3/12 of an hour gone by. what fraction of an hour remains of Nina class?

Question

nina science class lasts 5/6 of an hour. only 3/12 of a /12 of an hour gone by. what fraction of an hour remains of Nina class?

Answer 1

To complete this problem you need a common denominator.  The least common denominator of 6 and 12 is 12.

Now turn 5/6 into twelfths: 5  =  10    because 6 goes into 12 two times and 2 x 5 =10

                                       6       12  

 

With 3/12 hour gone by, you subtract that from 10/12     10/12 - 3/12 = 7/12 of an hour left