A pair that is not an equivalent fraction is: 5/16 and 3/8.
What is the equivalent fraction?
To create a fraction that is equivalent to a given fraction, you multiply the numerator and denominator by the same number.
This means for 5/8, we could have:
5/8; (5*2)/(8*2) = 10/16;
(5 * 3)/(8 * 3) = 15/24; etc.
For 1/2, we could have:
1/2; (1*2)/(2*2) = 2/4;
(1*3)/(2*3) = 3/6; etc.
Thus, a pair that is not an equivalent fraction is: 5/16 and 3/8.