Write a pair of fractions as a pair of fractions with a common denominator

So, what you do is find a Common denominator of 3/5 and 3/4 right? so its 20,
Multiples : 5 , 10 ,15 20,
Multiples : 4 8 12 16 20, okay put on /20  and how much times equals 20? "5!" so put in,
5/20 for 3/4. and do the same thing 3/5 = 4/20.

To find common denominator u multiply and find a common one