问HN:算盘学习;有人能解释一下拨动珠子的顺序吗?
你好,我决定学习算盘(双五进制编码十进制)。
我这样做是因为学习新事物很有趣,而且我喜欢算盘的触感、声音和离线操作的体验。
目前我正在练习用“正确”的手指上下计数,但我感觉很快就想开始进行简单的算术运算(加、减、乘、除)。
然而,我找到的资源并没有详细说明或展示推珠子的顺序。
可能我只是想得太多了,但我觉得这很重要。
例如:63 - 27
推珠子的顺序是什么,为什么?
我的猜测是:
- 从地球的十位上推1颗珠子(-10)
- 从天上的个位上推1颗珠子(+5)
- 从地球的个位上推2颗珠子(-2)
- 从天上的十位上推1颗珠子(-50)
- 从地球的十位上推3颗珠子(+30)
所以我先做-7,然后做-20,我也会先移动值最高的珠子。
这样做是否正确?
我怀疑我对数字和数值的理解不够准确,因为我习惯于以1-10-100的方式思考,而不是1-5-10-50-100。
如果你有任何资源或自己的经验可以分享,我将非常感激。
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Hello, I've decided to learn the abacus (bi-quinary coded decimal).<p>I'm doing it because it's fun to learn new things and because I like the tactile, soundscape and afk aspects of the abacus.<p>At the moment I'm practising counting up and down with the "correct" fingers but it feels like I want to start doing simple arithmetic calculations (+, -, × & ÷) soon.<p>However, the resources I'm finding don't really talk about, or even show, the order in which to push the beads.<p>It might be the case that I'm just overthinking this but somehow I think it matters.<p>For example: 63 - 27<p>What is the order to push the beads, and why?<p>My guess is:<p>- 1 bead from the earth 10 rod down (-10)<p>- 1 heaven 1 down (+5)<p>- 2 earth 1 down (-2)<p>- 1 heaven 10 up (-50)<p>- 3 earth 10 up (+30)<p>So first I do the -7 and then I do the -20, I also move the bead(s) with the highest value first.<p>Does this seem correct?<p>I suspect I'm not thinking about the numbers and values correctly as I'm used to think about numbers in 1-10-100s and not in 1-5-10-50-100s.<p>If you have any resource or your own experience to share I would very much appreciate it.