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小数乘法的算法是把它转化成整数乘法计算,最后处理积的小数点。其算理可以从两个角度分析,一是积的变化规律,二是计数单位的转化。理是说通了,但学生在列竖式计算时却经常犯困,他们不太能接受小数相乘在竖式中间过程中都变成了整数,而结果又变回了小数这样的过程。如果在列竖式时直接列成整数乘整数并推算小数乘法的结果,既不违背算理,还可以减少认知与书写中的许多麻烦。
The algorithm for fractional multiplication is to convert it to integer multiplication and finally to the decimal point of the product. The calculation can be analyzed from two perspectives, one is the law of product variation, and the other is the conversion of counting units. Reason is said, but students are often dilapidated in the column vertical calculation, they are less acceptable to decimal multiplication in the middle of the process have become an integer, and the result has returned to the decimal process. If the column vertical type straight integer integers and calculate the result of fractional multiplication, does not violate the arithmetic, you can also reduce the cognitive and writing a lot of trouble.