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目前,小学生在数学学习中,存在着许多不良习惯,如一些学生写字歪七扭八、漏掉数字、点错小数点等,有些学生计算粗心大意,计算后也不检查验算。如在教学“长方形的周长”时,我出示这样一道题:“小明家用篱笆靠墙围一个长方形菜园,长10米,宽7米,至少需要篱笆多少米?”有些学生就直接用长方形周长公式计算,显然是错的,问他们怎么想的,他们就说篱笆长就是长方形菜园的周长。学生根本就没有认真审题,没有思考“靠墙”的这一重要
At present, pupils have many bad habits in maths learning. Some students have misfits, missing numbers, wrong decimals, and so on. Some students calculate carelessness and do not check the calculation after calculation. When teaching “Circumference of Rectangles”, I showed the following question: “Xiao Ming’s home fence is surrounded by a rectangular garden with 10 meters in length and 7 meters in width, at least how many meters should he fence?” Some students Calculating directly with the formula of the perimeter of the rectangle is apparently wrong. Ask them what they think. They say that the length of the fence is the perimeter of the rectangular garden. The students did not seriously review questions, did not think “by the wall ” of this important