1, Definition Difference: Arithmetic refers to the truth in the calculation process, refers to the way of thinking in the calculation process, and solves the problem of why it is calculated this way. It emphasizes understanding the principle and thinking mode of calculation and helps students understand why a certain calculation method is needed. Algorithm refers to the accurate and complete description of the solution and a series of clear instructions to solve the problem. Algorithm is a systematic method to describe the strategic mechanism of solving problems.

2. Functional difference: The function of arithmetic is to let primary school students understand the way of thinking and truth in the calculation process and better master the calculation method. Through the understanding of mathematical theory, students can understand the principle and logic of mathematical calculation more deeply and cultivate their mathematical thinking ability. The function of the algorithm is to make it easier for primary school students to calculate and reduce the calculation time. The algorithm provides standard calculation steps, which enables students to calculate according to the specified order and method, and improves the accuracy and efficiency of calculation.