备学,即为学习做准备。研究表明,师生有准备地走进教室,能极大地提高数学课堂的教学效率。课前备学,能激活学生的生活、思维和学习经验,也促使教师尽早了解学生学习中存在的问题,这能为以学定教、因材施教奠定基础。这样的教学比起照本宣科,更有挑战性与创造性,这是学与教协同的课堂,当然也是高效的课堂。现以苏教版四年级下册“素数和合数”这一内容的教学,试着阐述备学后的课堂建构。 Preparation, that is to prepare for learning. Research shows that teachers and students are prepared to enter the classroom, can greatly improve the efficiency of teaching mathematics classroom. Pre-school study, can activate students’ life, thinking and learning experience, but also prompted teachers to understand as soon as possible the problems in student learning, which can lay the foundation for learning to teach, teaching students according to their aptitude. This kind of teaching is more challenging and creative than writing a book. It is a classroom where learning and teaching are synergistic and, of course, an effective classroom. Is the fourth edition of the Soviet version of the next book “prime number and the number of ” the content of teaching, trying to elaborate the class after school preparation.