H. Hadi Momenseraee - Department of ‎Mathematics, Tehran North Branch, Islamic Azad University, Tehran, ‎Iran.
M. Afshar Kermani - Department of ‎Mathematics, Tehran North Branch, Islamic Azad University, Tehran, ‎Iran.

In this paper , we present the first moment has been defined based on the center of mass from the fuzzy number, then with calculating area between the center of mass, a new ranking method has been proposed. At last we present some numerical examples to illustrate our proposed method, then comparing with distance index ranking method.

Ranking fuzzy numbers, Distance index, The first moment, The center of mass, Normal fuzzy numbers