《义务教育数学课程标准(2011年版)》指出,数学教学要紧密联系学生的生活实际,从学生的生活经验和已有知识水平出发,创设各种情境,为学生提供从事数学活动的机会,激发对数学的兴趣以及学好数学的愿望。《11-20各数的认识》是学生“10以内数的认识”的基础上教学的,是认识更大的自然数的基础,是学生数概念形成过程中的一次重大突破,也是学生认数过程中的一个节点,为后面的学习20以内 “Compulsory Education Mathematics Curriculum Standard (2011 Edition)” pointed out that mathematics teaching should be closely linked with the students ’actual life, starting from the students’ life experience and knowledge level, to create a variety of situations, to provide students with the opportunity to engage in mathematical activities, to stimulate Interest in math and the desire to learn math. “11-20 Understanding of Each Number” is a teaching based on the knowledge of students “10,” which is the basis for understanding a larger natural number. It is also a major breakthrough in the formation of the concept of number of students. Number of nodes in a process for later learning within 20