Respuesta :

First you need to change the fractions to common denominators, which in this case would be 40. 

So 5/8 * (5/5) =  25/40

Then 3/5 * (8/8) = 24/40

Then take the two and subtract 
25/40  -  24/40  = 1/40 

So Camille needs 1/40 cup of sugar.