Ningguang, who was walking here, saw so many people surrounded by Heyu Teahouse, and his expression suddenly became suspicious.
Has Yun Jin sang on stage yet?
"not at all."
Ke Qing shook her head: "It's Yan Fei, it looks like Yan Fei is talking about something in Heyu Teahouse."
When she just came, she saw Yan Fei in Heyu Teahouse talking eloquently.
"Yan Fei lectures?"
Hearing (cbch) to Ke Qing's words, Ningguang's face became suspicious: "Didn't Yan Fei say that there will be no lectures for these two days?"
She knew that Ke Qing had communicated with Yan Fei, and Yan Fei would not teach any law lessons in the past two days, so why did she teach again today.
And if Yan Fei was lecturing at Heyu Teahouse, where would Yun Jin be on stage?
"Forehead."
Just as he said that, Ningguang raised his eyebrows.
She saw outside not far away, there was a platform condensed from rock elements, and there were many seats around.
Obviously, that's where Yunjin came to sing.
There were also many people gathered there.
There are also many people gathered in Keheyu Teahouse.
"Yan Fei does what she says. Since she promised me, she will definitely be able to do it."
Ke Qing pondered: "It may not be a law class, or it may be other things, we can go and listen."
"It just so happens that Yun Jin is not on the stage now, so go take a look."
Ningguang smiled lightly and stepped forward.
"I didn't expect that this math is really amazing."
"Yeah, this so-called multiplication is actually so simple, and the numbers are easily obtained. If it was me, I always planned to play it."
"There is also division. With division, we don't need to subtract, just divide directly. Miss Yan Fei also announced this multiplication table, which is amazing."
"One for one, one for two, two for one, three for three. It's really powerful. This has a huge impact on the business world. Our Liyue businessmen will calculate better in the future."
"Not only that, but even the volume of an object can be calculated. Only then did I realize that this mathematics is really too broad and profound."
"Haha, with this Nine Nine Songs, I no longer have to worry about not being able to figure out the numbers."
........
When Ningguang, Keqing, and Baizhi approached Heyu Teahouse, they heard people gathered around Heyu Teahouse talking a lot.
Everyone's faces were very excited, and they kept talking about mathematics.
"math?"
Hearing these people's comments, Ningguang raised his eyebrows.
It seems that Yan Fei is teaching here, not the law class, but some mathematics.
Is it arithmetic?It does sound interesting.
She was very interested in what this person said just now.
Not only Ningguang raised her eyebrows, Ke Qing also raised her eyebrows.
It was the first time she had heard this one-for-one argument.
For a time, Ningguang and Keqing were curious.
Immediately, Ningguang, Keqing, and Bai Shi walked over from a nearby road.
Although the water around Heyu Teahouse is impassable, there is still a special road. This passage is for storytellers, or Yun Jin, or people who have emergencies.
In the past, when Yunjin was on the stage at Heyu Teahouse, the water that blocked Heyu Teahouse was blocked.
Liyue people also know this road, if there is any unexpected situation, then they will definitely understand.
Similarly, if there are people here who are blocked and unable to enter, there is a real urgency, and it is possible to walk in from this road.
Ningguang and Keqing walked in, instantly attracting the attention of many people.
"It's Lord Ningguang."
"And Lord Keqing."
"Tomorrow is the ceremony of inviting immortals. I didn't expect to see these two adults tonight."
.......
The arrival of Ningguang and Keqing attracted the attention of some people, and they talked with surprises on their faces.
They really didn't expect that they would see two of the Liyue Seven Stars on the eve of the invitation ceremony.
There are also people in front of them who are very fascinated and do not look back.
They seemed to be silent in the mathematics that Yan Fei was talking about.
As Ningguang and Keqing walked in, the two women soon saw the ninety-nine multiplication table attached to a board by Yan Fei.
It is a number engraved on a piece of white paper. It is clear at a glance and easy to understand.
"This."
Just glanced at the ninety-nine multiplication table and looked at the numbers a few times, and Ningguang's pupils shrank suddenly.
This algorithm is simply too convenient.
Because of one sign, two numbers easily yield the correct total.
She was a businessman and saw the value of this nine-nine multiplication table at a glance.
Next to the words of the ninety-nine multiplication table at the top, there is a gaze written by Yan Fei, which makes people know the operation of the multiplication sign.
Chapter 468: The popular math class, the owner of the eye of God from Fontaine (one update, three thousand five words)
In addition to multiplication, there is division.
Twenty-eight divided by seven and so on.
It's the reverse of the multiplication table.
This is so convenient.
With just a glance, Ningguang knew that this ninety-nine multiplication table could cause a shocking movement in Liyue's business world.
"I didn't expect that the effect of this multiplication table would be - so great."
At this time, Ke Qing, who was beside Ningguang, also saw the ninety-nine multiplication table, and said softly: "If everyone in Liyue has the ninety-nine multiplication table, then the so-called abacus can be completely eliminated, and simple arithmetic can be completely eliminated. - can be thrown away."
Ke Qing, who was born as a nobleman, and one of the seven stars of Liyue who is in charge of Liyue, also saw the value of this ninety-nine multiplication table.
"It's impossible for Yan Fei to take out this kind of thing for no reason. It's very likely that this kind of thing came from the shop owner."
Looking at Yan Fei who was talking eloquently, Ningguang thought: "The same is true for the previous law class, and the same is true for this mathematics now. Look at the book in Yan Fei's hand, that book should be from the shop owner's shop. something that came out of it."
"Ah."
Hearing Ningguang's words, Ke Qing nodded in agreement.
She also saw the book Yan Fei was holding, and Yan Fei's explanations all came from that book.
Apparently, the book came out of the owner's jar shop.
"Everyone, this is the ninety-nine multiplication table. I believe you have all seen it. As long as you memorize this ninety-nine multiplication table, you are almost an entry."
In the Heyu Teahouse, Yan Fei held a black pen and talked freely, while drawing on the posted white paper, while slowly saying: "The addition, subtraction, multiplication and division have been finished, let's talk about the multiplication of two or three digits by one. digits."
"For example, Auntie Wang ordered three boxes of black corn on the shopping website, each box of [-] corns. How many corns are there in total?"
"Sixty."
Yan Fei's voice just fell, and someone shouted without hesitation.
"Hmm, not bad."
Hearing this answer, Yan Fei smiled and nodded: "Twenty times three equals sixty, two ten times three equals sixty, and sixty equals sixty."
"Let's look at the next question, that is, there are six boxes of watermelons and six boxes of cantaloupe. Each box of watermelons is forty-eight molas, and each box of cantaloupe is sixty-two molas. I brought two hundred molas. Is there enough to buy? Four boxes of watermelons?"
"Forehead."
Hearing Yan Fei's words, the people present were stunned for a moment, and immediately began to count silently.
"Four boxes of watermelons, a box of forty-eight moras, forty-six, four-eight and thirty-two, that's one hundred and ninety-two, that's enough."
"Yes, one hundred six + thirty two = one hundred and ninety-two."
"Two hundred morahs are enough."
One person after another quickly figured it out.
"Yes, it is enough."
Yan Fei said with a smile: "Then let's count the cantaloupe again."
Yan Fei talked eloquently. In Yan Fei's mouth, advanced mathematics was very comprehensively analyzed and appeared in front of everyone, which made many people interested in mathematics.
Ningguang and Keqing are also listening quietly, even if they can figure out the answer at a glance, they are still listening at this moment.
Because they found out, Yan Fei's mathematics was deeply detected.
From the simple multiplication of a single number just now, to the multiplication of multiple numbers, one-digit multiplication by two-digit, and even three-digit numbers, the numbers are getting bigger and bigger, making it easy for people to master.
"Hey, Ningguang."
At this time, a laughter sounded, and Hu Tao patted Ningguang's shoulder, causing Ningguang to raise his eyebrows.
Just turning her head slightly, she saw Hu Tao who came to her at some point, and Hu Tao looked at her with a smile on her face.
Next to it, there is the owner and the Coral Palace Heart Sea.
"Good evening, shopkeeper."
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