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一、口诀定位法(归纳为六句口诀): 第一句:乘数与被乘数后边原有几个零,乘积后面应加上几个零,然后再定位。例如:0.10元×120斤,乘数与被乘数后面都务有一个零,算盘上得出的乘积为12,后边应加上二个零即1200,然后再定位。第二句:乘积后边有几个零,应加上几个零以后再定位。例如:0.55元×12斤=6.60元,乘积后面有一个零,算盘上显示的乘积66之后,应加上一个零,变成660以后再定位。第三句:乘积是整数,照抄后定位。
First, the method of location (summarized as six formulas): The first sentence: the multiplier and multiplicand behind the original number of zero, the product should be followed by a few zero, and then positioning. For example: 0.10 yuan × 120 pounds, the multiplier and the multiplicand are followed by a zero, the product of the abacus is 12, followed by two zero that is 1200, and then positioning. The second sentence: the product behind a few zero, should be added after a few zero positioning. For example: 0.55 yuan × 12 pounds = 6.60 yuan, the product behind a zero, the product displayed on the abacus 66, should be added to a zero, into 660 and then positioning. The third sentence: the product is an integer, copy after positioning.