Children learn from a very early age what it means to get their "fair share." Whether it is candy or birthday cake, many children successfully create equal-size groups or parts of a collection or whole but later struggle to create fair shares of multiple wholes, such as fairly sharing four pies among a family of seven. Recent research suggests that engaging and supporting students in fair-sharing tasks are meaningful contexts that can be used to strengthen their rational number reasoning (RNR). In this article, the authors discuss how to develop and strengthen students' rational number sense with problems that emphasize equipartitioning. They present fair-sharing activities, student work samples, and instructional ideas that can help middle grades students strengthen their rational number reasoning. (Contains 2 figures and 3 tables.)