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实物投影就是把实物置于投影器的载物玻台上,使它投印在银幕上形成图形,进行直观教学。实物投影取材容易,操作方便,能弥补一般投影图片的不足。所以,在小学数学教学中,实物投影具有很大的优越性。 1.实物投影直观形象小学生对数学概念的理解、掌握,都有一个从直观到抽象的过程.教具操作和投影图示都是直观教学的好办法。用实物投影则能集以上两种方法于一体,更为直观形象。比如推导三角形的面积计算公式:先剪两个同样大小的锐角三角形,在投影器上拼成一个平行四边形,让学生初
In-kind projection is to put the object in the projector’s loading glass, make it cast on the screen to form graphics, visual teaching. Material projection is easy to take, easy to operate, can make up for the lack of general projection pictures. Therefore, in the primary school mathematics teaching, the physical projection has great superiority. 1. Intuitive projection of physical projection Pupils’ understanding and mastery of mathematical concepts have a process from intuition to abstract, and the teaching of teaching aids and projection are good ways to visualize teaching. With the kind of projection can set the above two methods in one, more intuitive image. For example, derive the calculation of the area of the triangle: first cut two acute triangles of the same size, make up a parallelogram on the projector,