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计算教学的核心任务是提高学生的计算能力,使他们能正确、迅速、合理、灵活地进行计算。要实现这一教学目标,必须培养和训练学生具有以下计算意识。 一、总体观察,审清全貌 从总体上全面审查,看清题目的结构和全貌,然后才能出现“算机”,这是进行合理、灵活计算的重要前提。 例1 (1(17/52)-19/27)×(0.7+8(11/14)-5(5/28))×(3/4+0.5-1.25) 从全题看,是求三个因数的积。并可发现第三个因数3/4+0.5-1.25=0,故此题的得数为0。由于有总体感知
The core task of computational teaching is to improve students' computational skills so that they can calculate correctly, promptly, reasonably and flexibly. To achieve this teaching goal, we must train and train students to have the following computational awareness. I. Overall Observation and Examination of the Overall Picture Overall review and a clear overview of the structure and the overall picture of the problem can be followed by the appearance of “computer”, which is an important prerequisite for reasonable and flexible calculation. Example 1 (1 (17/52) -19/27) × (0.7 + 8 (11/14) -5 (5/28)) × (3/4 + 0.5-1.25) From the whole point of view, The product of a factor. And you can find the third factor 3/4 + 0.5-1.25 = 0, so the title of the number of 0. Because of the overall perception