Technology dominates the Three Kingdoms

Chapter 115 [Lu Lingqi's natural science student? 】

"Father, the daughters in the row above know each other." Lu Lingqi read it carefully, and could do basic addition and subtraction.

If you can't add and subtract, how can you count money!

People who have read books or do business can do basic addition and subtraction, which is also the crystallization of wisdom from the ancestors.

At the end of the Eastern Han Dynasty, there was already a world-leading [Nine Chapters of Arithmetic] in mathematics, but there were no simplified and convenient Arabic numerals and nine-nine multiplication tables, and many basic operations were time-consuming and labor-intensive.

Unlike later, now there are only simple calculations as a tool to assist calculations.It has not yet developed to the abacus that appeared later, and the appearance of the abacus has greatly improved the computing efficiency.

It is impossible to investigate who invented the abacus.But its use should be very early.At the end of the Eastern Han Dynasty, the mathematician Xu Yue's "Shushu Jiyi" recorded: "Abacus calculations are controlled at four o'clock, and there are three talents in latitude and longitude." For different colors, the upper beads of different colors should be five, and the lower four beads should be one each." There were abacus in the Han Dynasty, but the shape and structure were different from the later abacus.

Lu Bu didn't know Xu Yue, but Xu Yue should be nearly fifty years old at this time, so I don't know if his abacus has been effectively promoted.

Of course, no matter how much it is promoted, it is impossible for it to be spread to this remote and wild Jiaozhou.

Of course Lu Bu knew that Lu Lingqi didn't know Arabic numerals, if she did, it would be hell.

"It doesn't matter if you don't know these symbols, my father will teach you now. In fact, these symbols represent numbers: zero, one, two, three, four, etc. The symbol of 0 represents zero, 1 represents one, 2 represents two, 3 represents three, By analogy, the reading method is the same.”

"Oh, so that's it. It sounds very interesting. And it looks very simple. My father taught me how to write these symbols."

Therefore, Lu Bu began to teach Lu Lingqi to recognize and learn to write these Arabic numerals.

With Chinese numbers as a reference, it is very fast to learn. Of course, this is related to Lu Lingqi's learning ability.

In modern times, Lu Lingqi would be a good candidate for a science student.

Lu Lingqi is very interested in numbers and learns quickly.

After that, Lu Bu explained some complicated ones according to Chinese numbers, such as: 821 represents 820 one, 1562 represents one thousand and 560 two and so on.

The effect is simple and clear. As long as those Arabic numbers represent Chinese numbers, it is obvious that Arabic numbers look much simpler and clearer than Chinese number combinations.

Therefore, Lu Bu assigned Lu Lingqi homework to translate complex Arabic numerals into Chinese numerals.

I used more than a dozen slips and wrote more than 100 questions. Let Lu Lingqi finish the questions first, and then teach other addition and subtraction.

"Lord."

Suddenly, Chen Gong came to Lu Bu with a pile of letters in his arms.

These days, Chen Gong did his best to do things for Lu Bu, and he saw it all.

"Gongtai, you are here. Sit here first and have some fruit and a cup of hot tea." Lu Bu immediately ordered his servants to make preparations, and let Chen Gong sit on the table next to him.

Chen Gong did not refuse, "Thank you, my lord."

"My lord, these are the accounts of the money and food collected by the three counties of Nanhai County, Cangwu County, and Hepu County. Please check it, my lord."

Both Jia Xu from Cangwu County and Guo Jia from Hepu County have reported the money and grain accounts of the two counties to Chen Gong, and then Chen Gong compiled the money and grain of the three counties, which was completed this morning.

After it was completed, he held the account and came to Lu Bu to ask him to check and review it, and then stamped it.

"Suzuki has met Mister."

Lu Lingqi put down the homework in her hands, got up and saluted Chen Gong.

Chen Gong smiled and nodded, these days are too busy, he is a little incompetent as a teacher, facing Lu Lingqi's greetings, he feels a little guilty.

"Continue to do your homework, don't be lazy." Lu Bu looked at Lu Lingqi and said, this little girl seemed to be looking for an excuse to be lazy.

"Oh..." Lu Lingqi turned around aggrieved, sat at the desk beside her, and continued to do her homework.

Tea and fruit were brought up, and Lu Bu said politely: "Gongtai, drink tea first, and talk about business matters slowly."

"Thank you, my lord."

Chen Gong had no choice but to pick up the tea and taste it.

Lu Bu, on the other hand, picked up the slips and was flipping through them.

Among them are the summary of the three counties' fields, grain, money, population, and the planting of sweet potatoes, which are simplified and clear at a glance.

Suddenly, Lu Bu had an idea, looked at Lu Lingqi who was buried in her homework, and shouted, "Lingqi, come here."

Chen Gong was puzzled, not knowing how Lu Bu looked at the accounts, and suddenly called Lu Lingqi over.

"Father, wait a minute. I'll finish the homework right away, wait a minute." There are more than 100 questions, and there are more than a dozen questions left. Lu Lingqi really has the talent of a science student.

"Okay then, remember to finish it, and bring the slips here for father to check." Lu Bu was very relieved, a smart and lovely daughter is always loved.

Putting down the accounting slips, Lu Bu took the slips that he taught Lu Lingqi before, and handed them to Chen Gong: "Let's see if you're interested."

Chen Gong took the letter in doubt, opened it, and was immediately attracted by the familiar and unfamiliar symbols and numbers.Because I have seen such symbols on Lu Bu's map of Jiaozhou before.

Looking at the one-to-one corresponding Chinese numbers on these strange symbols, Chen Gong seemed to understand the meaning of these strange symbols.

"My lord, do these symbols represent these numbers?"

As for [Nine Chapters of Arithmetic] Chen Gong has read it, and is proficient in the basic arithmetic rules in it.

Lv Bu nodded with a smile, and praised: "Gongtai is indeed very intelligent, and you can understand it at a glance. These symbols and numbers 0123 mean that the number zero, one, two, and three in the text can be read in the same way."

At this time, Lu Lingqi came over holding the slips of completed questions, and smiled playfully, "Father, you see that everything is done, my daughter is smart."

But Lu Bu said with a straight face, "The speed is really fast, I don't know if I did everything right."

Like an adult, Lu Lingqi patted her chest in fear, and said confidently: "This is actually very simple, as long as you remember it, it will be very easy."

Lu Bu carefully checked them one by one, and at the same time passed the checked letters to Chen Gong for him to see.

Chen Gong asked Lu Lingqi's question, there were obviously two kinds of handwriting in the slips, and Chen Gong could recognize both.The uglier ones belonged to Lu Bu, while the good-looking ones belonged to Lu Lingqi.

There is no way, Lu Bu is not used to writing on the bamboo slips with a pen, so it is good to be able to write smoothly on the bamboo slips now, as for making it look good, I don't know how long it will take.

From the titles in the slips, Chen Gong understood that Lu Bu was teaching Lu Lingqi how to use those strange symbols and numbers.

However, upon closer inspection, Chen Gong somewhat understood.The more complicated the combination of numbers, the more obvious the advantages of these symbolic numbers, making it look simple and clear.

After reading all the letters, Lu Bu showed a satisfied smile, looked at Lu Lingqi, and praised: "As expected of my daughter, Bingxue is smart, and you answered all the questions correctly. You are really the pride of my father!"

　Thank you [Kiss us to be kinky] for rewarding 100 book coins for "Technology Controls the Three Kingdoms"!

　　
　
(End of this chapter)