For this question, we know James made flashcards for 

 of the words.
Lauretta made 

 of the amount of cards that James made.
So what we can do to find the total amount of cards Lauretta made with respect to the total amount of words, we can multiply these two values together:

We get this answer by multiplying straight across the fraction bars.
So now we know that 
Lauretta made cards for 
 of the total vocabulary words
 of the total vocabulary words.