Due to Wang Mang's humble and kind-hearted character, he quickly gained popularity in Tianlu Pavilion, and even other people in Tianlu Pavilion received more or less benefits from Wang Mang.

Therefore, whenever Wang Mang goes to work in Tianlu Pavilion now, everyone he meets along the way will greet Wang Mang warmly. Those with lower status than Wang Mang will call Wang Mang "Wang Shilang"; people with similar status will directly call Wang Mang "Ju".

"Jun".

It is obvious that at this moment Wang Mang has become a recognized good boy in Tianlu Pavilion! Everyone wants to be friends with him!

Wang Mang also enjoys this.

I think back to the time when I traveled back in time. In addition to having some social skills when I was young and going to school, after so many years of struggling in society, not only did I not become a smooth and sophisticated person, but I became increasingly unfamiliar with interpersonal communication. In the end,

He has almost become a tool man without friends and desires.

But since he became the current Wang Mang, perhaps because of time travel, Wang Mang's personality has undergone tremendous changes. He is not only philanthropic, but also very good at communication. This change really surprised Wang Mang.

It feels so good to have friends everywhere you go!

On this day, Wang Mang was still courteous and greeted everyone he met along the way. After greeting these people, Wang Mang arrived at Tianlu Pavilion.

Today, Tianlu Pavilion is still staffed by Wang Mang, Liu Xin and Yang Xiong.

After Wang Mang entered the door, he bowed his hands to Liu Xin and Yang Xiong and said, "Mang has seen two wise men."

When Liu Xin and Yang Xiong saw Wang Mang coming in, they both smiled and said, "Here comes the great king."

Wang Mang said: "The two wise men always come to the pavilion earlier than Mang, which makes Mang ashamed."

Yang Xiong smiled and said: "Jujun, don't blame yourself like this. Zijun and I arrived early because we both had to spare time to do other things."

Wang Mang said: "Brother Ziyun, Brother Zijun, you can tell Mang if you have anything to do. Mang is also willing to help these two wise men."

Yang Xiong put the bamboo slips he was looking for on his case and said: "What the two of us have studied in our spare time is just a trivial matter, not worth mentioning. You just have to do your duty well."

Wang Mang sighed: "Brother Ziyun said this, which is a shame. Every time Mang comes to the pavilion, all the affairs in the pavilion have been taken care of by the two brothers, and the only thing Mang can do is read a book."

.If the two brothers don’t mind being reckless and stupid, I would like to help them.”

Liu Xin raised his head and glanced at Wang Mang, who was so enthusiastic. He also paused and said directly: "If you can solve this problem, you can help me."

After saying that, Liu Xin handed over a volume of "Nine Chapters of Arithmetic" written by Zhang Cang, the Marquis of Beiping in the early Han Dynasty. Wang Mang stepped forward to take it. Liu Xin continued: "If you can calculate the square fields in the first chapter,

Just be correct."

After Wang Mang listened to Liu Xin's question, he focused on the volume "Nine Chapters on Arithmetic".

According to Liu Xin's request, Wang Mang began to read the Fangtian problem recorded in the first volume of Jiu Zhang Arithmetic.

Fangtian is the first chapter of the nine chapters on arithmetic, which mainly describes the calculation method of the area of ​​plane geometric figures.

These include calculation methods for eight types of graphic areas: rectangle, isosceles triangle, right-angled trapezoid, isosceles trapezoid, circle, sector, bow, and ring.

In addition, the four arithmetic rules of fractions and methods of finding the greatest common divisor of numerators and denominators are systematically described. There are 38 examples and 21 established techniques.

After Wang Mang finished reading these contents, his face showed a look of contemplation.

As we all know, mathematics is the most difficult subject regardless of ancient or modern times.

Fortunately, Wang Mang received a systematic basic mathematics education, and after merging with the soul of the original Wang Mang, he did not feel any discomfort when reading these documents in pure classical Chinese without punctuation.

So Wang Mang quickly finished reading these thirty-eight examples and twenty-one techniques. After reading these, Wang Mang began his problem-solving ideas.

Wang Mang's problem-solving ideas are very straightforward. After intensive reading of Fang Tian's chapter, the mathematical memory deep in Wang Mang's memory was awakened.

Wang Mang knelt down on the desk beside him, looking at the examples and starting to solve the problems using the mathematical thinking he had learned.

Wang Mang unfolded a blank bamboo slip and laid it horizontally. Using each bamboo slip as a horizontal line, he wrote down his ideas for solving the problem in an orderly manner, line by line.

After seeing Wang Mang laying the bamboo slips horizontally, Liu Xin sighed in his heart, thinking that Wang Mang would definitely not be able to solve these square field techniques.

However, when Liu Xin saw Wang Mang's meticulous expression, he was seriously writing on the horizontal bamboo slips, he couldn't help being surprised, "Could he really be good at arithmetic?"

With doubts and curiosity, Liu Xin got up from his desk and walked silently to Wang Mang. He saw that Wang Mang was seriously writing a solution to the problem in characters he couldn't understand.

It makes Liu Xin feel very unreal.

But this methodical and rhythmic way of solving problems still gave Liu Xin an indescribable feeling. Liu Xin felt that Wang Mang really knew how to do arithmetic.

But he couldn't understand the arithmetic method Wang Mang wrote, which made Liu Xin feel extremely ridiculous and felt like he was going crazy.

After waiting for a long time, until noon (noon), about two hours later, Wang Mang finally put down his pen.

Looking at the pile of bamboo slips filled with writing on the side, he felt extremely satisfied. He moved his shoulders to relieve the sore muscles caused by the long posture, and breathed a sigh of relief, "Finally finished writing."

After Liu Xin heard Wang Mang's emotion, he immediately reached out and picked up the bamboo slips that Wang Mang had just written. Looking at the solution to the problem like a charm on it, he asked Wang Mang: "What's the solution?"

Wang Mang was suddenly awakened by Liu Xin's sudden question. He finally came to his senses and exclaimed in his mind, "Oh no! Why are you using Arabic numerals!"

But now that it was done, Wang Mang could only bite the bullet and explain: "This character is what I got from communicating with people from outside the Han Dynasty. I saw the unique radicals of the characters, so I understood some of the ideas and turned them into corresponding Chinese characters.

Count, so we get this shape."

Liu Xin didn't have any doubts after hearing Wang Mang's explanation. He also knew that Wang Mang was a kind-hearted person and liked to make friends. It was normal to have some friends from outside the country.

Therefore, Liu Xin then began to ask Wang Mang about the numbers of Chinese characters corresponding to the Arabic numerals he could not understand, and Wang Mang answered them one by one.

After Wang Mang finished explaining, Liu Xin's eyes were as bright as the stars in the sky. He exclaimed: "Wonderful! This transformed number is so exquisite that it not only lowers the threshold for learning arithmetic, but also makes it more intuitive and concise!"

It’s truly a unique initiative!”

At this moment, Liu Xin was even more fond of Wang Mang's expression. He did not expect that Wang Mang could give him such a big surprise. Even if Wang Mang's calculation of the Fang Tian question was wrong this time, Liu Xin would not dislike Wang Mang.
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Being able to create such a simple mathematical calculation method based on Fanren's writings is enough to show that Wang Mang is also a top-notch smart person. Such a smart person is naturally qualified to be friends with Liu Xin!

Like his father Liu Xiang, Liu Xin was a rare young genius. He was extremely proficient in the study of the Five Classics and astronomy. It can be said that both father and son were proud and high-minded people.

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Chapter completed!