Su Xiner asked: "So, is it still the same as before?"
Su Mo has also studied ancient multiplication and division, and used the abacus method to calculate calculations. In fact, it is also very accurate and fast, and for some people with high talents, their mental arithmetic is very powerful.
Usually, brokers who do business have everything in their sleeves. They do mental calculations and complex calculations with their fingers, and they can quickly get the answer. Then they hold the other person's hand, cover it with their sleeves, and tell others his price.
To avoid unfair bidding.
For example, the ancient astronomers and those who were good at Five Elements and Bagua, such as Zhang Liang, Zhuge Kongming, Liu Ji, etc., were all mathematicians who were good at calculations.
But after all, they are a minority, and most of them are still incompetent and even illiterate. They have to hire special people to calculate big accounts.
Not to mention accounting.
Therefore, based on the principle of quickness, simplicity and economy, Su Mo taught them the formulas of addition, subtraction, multiplication and division of modern mathematics.
Anyway, it's not very complicated, and you don't need to teach too much. Just the basics are enough for them to use.
Those people are all smart. They have already mastered addition and subtraction by comparing the number tables. They write very formally without any mistakes.
Su Xiner is worse.
Then Su Mo also wrote out the multiplication table and asked them to frame it and hang it in the accounting room in the backyard so that shopkeeper Xing could learn from it.
Combined with this, it is very convenient to do simple multiplication and division.
Especially for multiplication and division of small amounts, just memorize it. You don't have to carry a small abacus with you, and it can speed up mental and oral arithmetic.
Moreover, her original intention was to facilitate accounting and do some simple multiplication and division.
If you really want to reconcile the accounts, then of course it is better to make an abacus accurately and quickly.
So she encouraged them to use the numbers she taught to keep accounts and calculate with an abacus, which was the most reasonable and quickest method.
Those who used to settle accounts quickly, but now that they have been changed, they really feel more useful.
It's just that I'm not proficient enough. After all, to learn a new thing, you need to get used to it and practice a lot.
After lunch, everyone practiced individually, in groups of three, some counting, some recording, and some taking an abacus.
By writing it down in this way, even if you have to look up at the digital comparison table, it will be faster.
Then I took a quick look at the account book after I finished recording it. The rows were very clear. It was definitely not like before, which was so densely packed that I had to read them one by one, and each one was as big as ten.
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Chapter 20. That’s all for today. I’ll try to continue tomorrow. I have to go out in the afternoon and can’t type anymore.
I wish everyone a happy reading, fun, and group hugs!
