数学课程标准中谈到“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出发,创设生动有趣的情境,引导学生开展观察、操作、猜想、推理、交流等活动,使学生通过数学活动,掌握基本的数学知识和技能,初步学会从数学 Mathematic curriculum standard talked about ”mathematics teaching, should be closely related to the students ’living reality, starting from the students’ life experience and existing knowledge, create vivid and interesting situations, and guide students to observe, operate, guess, reasoning, communication and other activities , So that students through math activities, master the basic mathematical knowledge and skills, preliminary learned from mathematics