Question

how can you tell when two unlike fractions are equivalent?

Answer 1

a/b = c/d when ad = bc


So for example, 1/2 = 3/6 because 1*6 = 2*3 (both equal to 6)

Answer 2

Set them equal to each other then cross multiply. If their values come out to be equal, then they are equivalent

Answer 3

So

does 2/3 = 4/8 ?

Let's find out:
Cross Multiplying gives

12 = 16 , so no they are not equivalent.

Does

2/3 = 6/9 ?

Cross Multiply:

18 = 18, so yes