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已经掌握了数学法则还必须转化为运算技能。运算技能的形成是不断运用运算法则,经过多次合理练习而实现的。衡量运算技能的标志是看运算的准确度、速度、灵活性和意识到运算法则的清晰程度。那么应如何提高运算的准确度和速度呢?除了教会学生基本算理外,还要引导学生总结规律,找出捷径,使学生在运算过程中,少花时间和精力,做到“一感知算式,就立即直接得出答案”,如此,口算(心算)能力便会大大提高。 我在讲完20以内的进位加法和退位减法后的复习中采取了如下做法:
Already mastered mathematical rules must also be converted into computing skills. The formation of computing skills is the continuous use of algorithms, after many reasonable exercises to achieve. The hallmarks of computing skills are to see the accuracy, speed, flexibility, and clarity of the algorithm. So how to improve the accuracy and speed of operation? In addition to teaching students basic arithmetic, but also guide students to summarize the law, find a shortcut, so that students in the calculation process, less time and effort to achieve “a perceived formula , They immediately come to the answer directly, ”so that the port count (mental arithmetic) ability will be greatly enhanced. I finished the following additions within 20 and additions after absenteeism subtraction took the following practices: