一、借助学生熟悉的实物原型,以旧引新,建立新概念概念属于抽象思维的范畴。小学生抽象思维能力有限,应借助学生熟悉的实物巧妙合理地引入新概念,使学生不感到陌生,易于接受。如,建立长方体概念时,先将收集到的生活中经常接触的实物:方砖、火柴盒、纸箱等,让学生通过观察认识到 First, with the students familiar with the prototype in kind, the old introduction of new concepts to establish a new concept belongs to the category of abstract thinking. Students with limited ability to abstract thinking, students should be familiar with the ingenious and reasonable introduction of new concepts, so that students do not feel strange, easy to accept. For example, when creating the concept of a cuboid, the objects that are often touched by life, such as square bricks, matchboxes and cardboard boxes, will be collected first to allow students to recognize through observation