1. the 3 matzot resamble the 3 parts of our nation kohen levi israel  we brake the mddle matza and we "hide" the middle part to show that that the reall reward for ou torah and mitzvot will be in the world to come and small part that we can see is the benfit of our mitzvot that we can see in this world in our lifetime. 

2.  *bigger some houses have the minhag that the hostn is hiding the Afikoman in some the kids are hiding the Afikoman that entire afikoman game is there for one reason to keep the kids interested in the seder
 


haggadah Section: Yachatz