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小数乘法的计算法则是通过小数乘以整数、整数乘以小数和小数乘以小数三方面的内容来进行教学的。小数乘法法则和整数乘法法则基本相同,所不同的是如何确定积的小数点位置,所以教学中要充分引导学生应用知识的迁移规律理解和掌握计算法则。 一、要讲清确定积的小数点位置的道理和方法。 讲清确定积的小数点位置的道理是正确掌握小数乘法法则的关键。教学时要利用准备题让学生了解因数的变化引起积的变化规律,同时运用教材中各例题的虚线方框里的计算过程帮助学生理解并掌握算理。如教学例1时,可根据虚线方框里的计算过程设计问题引导学生得出计算法则:1.被乘数1.3变为13发生了什么变化? 2.乘数5有没有变化? 3.
The law of decimal multiplication is taught by multiplying fractions by integers, integers by fractions and fractions by the fractional three. The principle of fractional multiplication and integer multiplication are basically the same. The difference is how to determine the decimal point position of the product. Therefore, students should be guided fully in the application of the law of knowledge transfer and grasp the rules of calculation. First, we should clarify the product of the decimal point location truth and method. The rationale for clarifying the position of the decimal point is the key to a proper grasp of the rules of fractional multiplication. Teaching should use the preparatory questions for students to understand the variation of the factor caused by the product of the law of change, while the use of textbooks in various examples of the dotted line box in the calculation process to help students understand and master the arithmetic. For example, in teaching example 1, students can be guided to calculate the rules of calculation according to the calculation process in the dotted box: 1. What happened to multiplicand 1.3 to 13? 2. Has multiplier 5 changed?