Title: MILE: Memory-Interactive Learning Engine for Solving Mathematical Problems. Abstract: Mathematical problem solving is a task that examines the capacity of machine learning models for performing logical reasoning. Existing work employed formulas as intermediate labels in this task to formulate the computing and reasoning processes and achieved remarkable performance. However, we are questioning the limitations of existing methods from two perspectives: the expressive capacity of formulas and the learning capacity of existing models. In this work, we proposed Memory-Interactive Learning Engine (MILE), a new framework for solving mathematical problems. Our main contribution in this work includes a new formula representing technique and a new decoding method. In our experiment on Math23K dataset, MILE outperformed existing methods on not only question answering accuracy but also robustness and generalization capacity.