From Wu's article:

Quote
If next year's math curriculum is consistent with the CCSSM, then students in North Carolina will learn the following topics that are not in the previous fifth-grade standards: the correct way to add, subtract, and multiply fractions; the correct way to divide whole numbers by a unit fraction and a fraction by a nonzero whole number; the reason why the area of a rectangle is the product of (the lengths of) the sides when the side lengths are fractions; a correct way to think of volume; and a correct conception of a coordinate system.
The word "correct" is used often above. What does it mean? Were 5th grade students previously not taught to multiply fractions using the formula

a/b * c/d = (a*c)/(b*d) ?

My 8yo is learning to do this in EPGY 5th grade math.