课堂练习是小学数学课堂教学结构中重要的一环。通过练习,不仅可以使学生加强对概念、算理的理解,激发学生学习的兴趣,而且能够使学生对知识的掌握情况及时反馈给教师,发现学生知识上存在的缺漏,了解学生智能发展的情况,为今后的课堂教学提供改进教法和学法的依据,使教师的主导作用得以充分地发挥。因此,合理、灵活、科学地设计课堂练习,是减轻学生课业负担,提高课堂教学效率的有效途径。一、新课前的练习 Classroom practice is an important part of the elementary mathematics classroom teaching structure. Through practice, not only can students strengthen their understanding of concepts and arithmetic, stimulate student interest in learning, but also enable students to timely grasp the knowledge of the feedback to teachers, students found that knowledge of the gaps, understand the development of student intelligence , To provide the basis for improving the teaching of law and learning law for future classroom teaching, so that the leading role of teachers can be fully played. Therefore, designing a reasonable, flexible and scientific classroom practice is an effective way to reduce the burden of classwork and improve the efficiency of classroom teaching. First, the new class exercises