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在小学数学人教版五年级(上册)中,第五单元的教学是“多边形的面积”。教材中一共安排了四部分内容,平行四边形的面积、三角形的面积、梯形的面积和组合图形的面积。在教学过程中用以旧知引新知,拼接和数格子的方式,使学生由感性思维过渡到逻辑思维,从而使学生掌握图形的面积计算公式。学生在学完上述关于平行四边形、三角形、梯形的面积公式内容后,已经感到枯燥,所以在教学组合图形时转变了教学方法。组合图形是由基本图形组合而成,
In the fifth grade primary school mathematics PEP (the first volume), the fifth unit of teaching is “area of polygons ”. Textbook arranged a total of four parts, the area of the parallelogram, the area of the triangle, trapezoidal area and the area of the combination of graphics. In the teaching process, we use the old knowledge of new knowledge, stitching and the number of lattice way to enable students to transition from the emotional thinking to logical thinking, so that students master the area of ?? graphics formula. After learning the contents of the formula for area of parallelogram, triangle and trapezoid, the students are already feeling boring, so they changed the teaching method when teaching graphic composition. Combination of graphics is a combination of the basic graphics,