Speaking of this place in Arabia, Li Chengqian remembered.

Arabic numerals are composed of 0,1,2,3,4,5,6,7,8,9 a total of 10 counting symbols, Arabic numerals were first invented by the ancient Indians, and then transmitted to Europe by the Arabs, and then modernized by the Europeans, people thought it was an Arab invention, so people called it "Arabic numerals".

And ancient India called it Tianzhu at that time, so Li Chengqian said: "This number was invented by Tianzhu, this king accidentally found it in a book called Arabic, felt novel, and wrote it down, I didn't expect the algorithm to be very useful ≮ is this king called it Arabic mathematics!" ”

Kong Yingda didn't suspect anything, he said: "It turned out to be the Tianzhu number, remember that Tang Seng went to Tianzhu some time ago, and when he returns, there will be a lot of harvest!" ”

For Tianzhu, everyone is also yearning. After all, it's an unknown world, and everyone says it's good.

But when they know that it is actually not very good in the future generations, and they let Huaxia crush it, they should feel proud.

But for Li Chengqian now, none of this matters.

Wei Zheng said at this time: "I wonder if His Royal Highness the Crown Prince can interpret the meaning of these numbers for us?" ”

"Naturally!"

The next step is to promote, so there's no need to hide it.

So he began to teach the two of them ten Arabic numerals, and explained the combinations of them.

It starts in single digits and goes all the way up to billions, then to percentages, fractions, and so on.

……

Li Chengqian can spend a lot of time talking about these things and so on.

In the end, Kong Yingda and Wei Zheng felt very magical.

Kong Yingda said: "It turns out that Tianzhu's numbers are so exquisite! ”

Li Chengqian also felt that these mathematics were really better than the current one, two, three, four...... Much easier to use.

Immediately afterwards, Li Chengqian began to explain to them the use of addition, subtraction, multiplication and division symbols, which made them even more amazed.

I have to admit that Arabic numerals do have an absolute advantage in calculation.

Addition, subtraction, multiplication and division can be calculated by listing a formula, and there is no need to calculate chips at all, not to mention convenience.

He also mentioned the concept of unknowns, although the two of them heard it in a fog, but in the end they still understood a little, after all, the solution method in "Nine Chapters of Arithmetic" is similar to Arabic numerals.

A line of three people, directly reversed.

Kong Yingda became a teacher, and now it seems that he is like a knowledge-seeking primary school student, eager to learn and concentrated......

In the end, the two actually wrote down the ten numbers, and even knew how to draw inferences.

This point made Li Chengqian admire, and those who could really become officials were not ordinary people.

Of course, this is inextricably linked to his teaching methods.

You know, he has the ability to be a talented man, and all problems, including teaching methods, are simple primary school problems for him here, so he is very handy in teaching.

In the end, Kong Yingda couldn't help nodding and said: "His Royal Highness the Prince, the old man has learned something today, if he can promote these things to my Datang, then Datang will also prosper!" ”

Kong Yingda's idea is good, but who will push it is a question.

Li Chengqian said directly: "Why don't you talk about Master Confucius and Your Majesty?" ”

Kong Yingda agreed: "Okay, good! It's up to the old man to do it! When the time comes, can His Royal Highness the Crown Prince prepare some teaching materials for the old man? Teach with me? ”

"That's nature! Let Datang prosper is what I Datang people should do! ”

Seriously, these numbers are not difficult, just addition, subtraction, multiplication and division, it doesn't take many lessons, as long as you teach the first wave of people and let them teach them in geometric numbers, they will definitely be able to blossom more.

No matter how advanced it is, such as college numbers, then these people will definitely not be able to learn it] and they will not need it before, and they may have the opportunity to learn it in the future.

But with this foundation, it will be much easier to teach in the future.

Wei Zheng also said on the side: "In this way, Datang is really overcome!" ”

"Hahaha! There is a lot of hard work for the Confucius Master! ”

Arabic numerals, in fact, are not Li Chengqian's main work, but since they were known this time, they were promoted by the way.

Anyway, this is still beneficial to Datang.

"Don't worry, there is an old man here! Little things, little things! ”

In this way, with Kong Yingda here, it won't matter.

At this time, Kong Yingda said: "Damn, then Li Gang dares to bully me, come up with this difficult problem, make the old man ugly, wait for me to use Arabic numerals to take revenge!" ”

This guy really doesn't accept old age, what is he tossing with an eighty-year-old man! He's just fighting for a breath, literati, it's all like this.

"By the way, His Royal Highness the Prince, the old man wants to ask for a question! Take a test of Li Gang! ”

Li Chengqian was speechless for a while, okay, I'll give you a question.

So he said, "There were 12 lit candles on the table, but three were blown out by the wind, and soon another gust of wind blew out two candles, and finally how many candles were left on the table?" ”

As soon as this question came up, Kong Yingda smiled.

"His Royal Highness the Crown Prince, there won't be such a simple question, right? It's seven, it's seven, right? ”

"Think again!"

Li Chengqian laughed, this guy really doesn't know how to listen to the topic.

"His Royal Highness the Prince, this topic is too simple, let's change the topic!"

"Master Confucius, you got it all wrong, and you said it was simple?"

Wei Zheng on the side was also puzzled.

"His Royal Highness the Crown Prince, isn't it seven? The minister also counted seven. ”

Both of them were wrong, and they were very wrong.

Li Chengqian smiled.

"Ahem...... If the candle burns out, will it still exist? You say, how many of them haven't burned? ”

As soon as these words came out, the two of them were immediately ashamed.

This kind of problem is too simple, but it is easy to make mistakes.

Wei Zheng reacted first, he said:

"High high! His Royal Highness the Crown Prince is really tall! ”

And Kong Yingda then said: "Hey, why didn't the old man expect that the five roots of the matter would be extinguished!" Hahaha! ”

This seems to be a problem of mathematics and not mathematics, and he accidentally fell into the pit, if he gave this question to Li Gang, he would probably make a mistake for a while, and he couldn't answer it.

Then Kong Yingda smiled again: "This Li Gang, I don't think I can defeat you!" His Royal Highness the Prince, the old man will retire now! ”

Kong Yingda's excited expression is like a child.

"Go ahead!"

With Kong Yingda's departure, it was already close to evening at this time.

Time always flies too fast, and it's very inadvertent.

Then let's see how Kong Yingda talks to Li Shimin about this.

With his endorsement, Li Shimin will definitely come to beg him to let him promote Arabic numerals.

Lao Yan came to ask for a monthly pass again and everyone spread this book more, spread it to more people, and you can get book coupons, so I'm sorry for everyone.

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