小学高段的教师和学生在学习有关圆柱圆锥的表面积、体积时,最头疼的就是相关的计算了。当圆周率π取值为3.14时更是增加了计算的难度,错误率常年居高不下。提出改变列式方式,圆周率不写成3.14而用字母π表示,在计算的最后一步再换成3.14算出得数,这样可避免π多次参与乘法运算,从而使计算简便。最后提出设想:是否能不算出最后的数据,而用π来表示最后的计算结果? The most troublesome thing teachers and students in the upper primary school are learning about the surface area and volume of a cylindrical cone are related calculations. When pi value is 3.14, the calculation difficulty is increased, and the error rate is always high. Proposed to change the column mode, the pi is not written as 3.14 and the letter π said that in the last step of the calculation and then replaced by 3.14 calculated the number, so to avoid π multiple times in multiplication, so that the calculation is simple. Finally, the idea is proposed: whether to calculate the final data, and use π to represent the final calculation?