(1) When we multiply two fractions, do we need common denominator? Why or why not? Explain your answer by an example.

(1) When we multiply two fractions, do we need common denominator? Why or why not? Explain your answer by an example. 
(2) Simplify 14/15ˆ’(ˆ’2/3)^2ˆ2 . Show all the steps.