小朋友,如果有人问你,手是用来做什么的,你可能有许多答案——吃饭、洗衣服、写作业……在这里,我再教你一招:用手来学测量。招法1——记进率我们学过的长度单位有——千米、米、分米、厘米、毫米。这些长度单位彼此间的进率并不完全相同,有的是10,有的却是1000。怎样快速地记住它们呢?只要按右图那样伸出你的一只手就可以了。假定我们的大拇指代表千米,食指、中指、无名指、小拇指分别代表米、分米、厘米和毫米(不必考虑手指长度与长度单位之间的对应关 Children, if someone asks you what the hand is for, you may have many answers - eating, washing clothes, writing homework ... Here, I’ll teach you a trick: measuring by hand. Recruit 1 - record rate We have learned the length of units - km, m, decimeter, centimeters, millimeters. The rate of these units of length between each other is not exactly the same, some 10, while others are 1000. How do you remember them quickly? Just stick your hand as you see on the right. Assume that our thumbs represent kilometers, forefinger, middle finger, ring finger and little finger represent meters, decimeters, centimeters and millimeters respectively (without regard to the correspondence between finger length and length units