smartboard vortex.In the process of mathematics teaching in primary schools , the most headache for mathematics teachers is that students can hardly understand and learn to apply abstract problems in mathematics , and this problem can be solved by means of electronic whiteboards. For example, the same class of heterogeneous activities held in our school last year, the two teachers at the same time in the sixth grade "magnification and reduction of graphics." Both teachers are able to use the electronic whiteboard to successfully demonstrate the introduction of ??introduction in context, cognition in activities, innovation in inquiry, complementarity in communication, sublimation in reflection, improvement in application?? and so on. The teaching concept, the classroom can be clear, focused, and difficult to achieve effective breakthroughs, to achieve the expected classroom effect. At the beginning of the class, both teachers created an effective situational introduction. The difference is that Teacher A chose the photos of the classmates. By using the different scale-up functions of the electronic whiteboard, the students can experience the enlargement in real life. Application, to reveal the subject; another teacher B introduced the photos of their Tang Xiaomei campus, using the function of the prologue to gradually show the students to the class, let the students feel close, and suddenly close the teachers and students Distance, the highlights of the teacher in this part is not only to create the situation, but also to put the photo in the grid of the electronic whiteboard, through the question: the same is magnified, what is the difference? Let students naturally think of how much each side of the graph is enlarged in their minds, basically solving the difficult points of this lesson. In the expansion part of the class, the two teachers showed their magical powers. The same thing is that this is not just a pure math class. It can expand the students' horizons, embodying mathematics from life, and mathematics application and life. The difference is that Teacher A has collected a lot of pictures using the scale. For example, our Shenzhen World Window, the enlarged picture of the snowflake is beautiful, etc., and many beautiful pictures are designed to be displayed to the students gradually; Teacher B is expanding this aspect. The main focus is on the use of enlargement and reduction. The copying machine is enlarged by 200% and reduced by 50%. To design a beautiful picture into a newspaper held by the school, it needs to be scaled down according to a certain scale. The image slides stimulate the interest of students in the electronic whiteboard one by one.