小数点的移动在换算单位时经常用,小数的除法中也用到,在这里对小数点的移动有几点思考。就换算单位而言,单位有很多:时间单位、重量单位、长度单位等等。同样的单位之间,既要记住进率,又要记住大小排列,是有一定技巧的。比如说对长度单位的记忆,如图1所示,不仅形象地把长度单位排列起来,而且大拇指与食指之间的距离最大,他们之间的进率也最大,其余四指之间的距离近似相等,所以它们之间的进率也相等。接着是面积单位的记忆,如图2所示,在大拇 The decimal point of the movement is often used in the conversion unit, the decimal division is also used, here on the decimal point of the move a few ponders. In terms of conversion units, there are many units: time unit, weight unit, length unit and so on. Between the same units, it is necessary to remember the rate of entry, but also to remember the size of the arrangement, there is a certain skill. For example, the length of the unit of memory, as shown in Figure 1, not only the length of the unit arranged in the image, and the thumb and index finger maximum distance between the maximum rate of progress among the remaining four fingers Approximately equal, so the rate of entry is the same between them. Followed by the area of ​​memory units, as shown in Figure 2, in the thumbs