活动内容认识“高斯求知”规律 ,巩固“能被２、５、３整除的数的特征”。（五年级）活动目的１ 通过活动 ,认识“高斯求和”规律 ,会计算简单的等差数列之和。２ 通过引导学生运用“高斯求和”规律 ,巩固“能被２、５、３整除的数的特征”。３ 通过联系实际生活 ,激发学生学习 Activities Understand the law of “Gaussian knowledge,” consolidate “can be divisible by 2,5,3 the number of features.” (Grade 5) Objectives 1 To understand the law of “Gaussian summation” through activities, calculate the sum of simple arithmetic progression. 2 Consolidate “the characteristics of numbers divisible by 2, 5, 3” by guiding students to apply the law of “Gaussian summation.” 3 By connecting with the actual life, to stimulate student learning