Kids don't hate math. Not even fractions. Ask them to divide a bag of candy among themselves and watch them tackle the problem. What they hate is repeat computation, void of context. Add a timer and they really hate it.
Using Legos in the classroom is not a new concept at all. There are so many different classroom applications for the popular brightly colored bricks, and despite the myriad of uses, the go-to task for Legos is most often math. The handy little nubs sitting atop the bricks offer a chance to teach things like area and perimeter, the different colors lend themselves well to fractions.