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教学目的:①使学生认识和掌握特殊的简算方法,(?)计算能力;②训练学生的思维,培养和提高(?)的观察、分析推理能力。教具准备:①数学家高斯画像一幅;②大小相同(?)方形硬纸片36张,其中白色1张、黄色3张、红色5张、蓝色7张、棕色(?)张、绿色11张;③油印题签(?)1号、第2号各若干张(张数与参加活动的学生数(?)教学班级:武汉市第二师范附小四年级四班。
Teaching Objectives: ① enable students to recognize and master a special method of calculation, (?) Computing power; ② train students' thinking, training and improving (?) Observation, analysis of reasoning ability. Teaching aids to prepare: ① a mathematician Gaussian portrait; ② the same size (?) 36 square pieces of cardboard, white one, yellow 3, red 5, blue 7, brown (?) Zhang, green 11 Zhang; ③ oil seal question mark (?) No. 1, No. 2, a number of Zhang (number of students and the number of participating activities?) Teaching Class: Wuhan City, Second Normal attached to the fourth grade four classes.