Jin Fengniang was stunned for a while when she heard Zhou Jun's words, then covered her face and smiled: "Erlang, don't joke, what kind of person is Pang Gong? How could she look down on a servant like Ping Po?"

Zhou Jun asked again: "What if Mr. Pang was willing?"

Jin Fengniang thought for a long time and said to Zhou Jun: "What Erlang said, Fengniang should have obeyed me. But Ping Po has been with me for many years. Although the daily expenses are not considered wealthy, they do not have to worry about food and clothing."

"Then Mr. Pang used to work in the palace and had a very high vision. I was worried that he would be harsh on his servants and could not bear to have Pingpo suffer in vain."

Zhou Jun said: "There are very few slaves in Mr. Pang's mansion, and most of them are old slaves. There are many words to protect the master in their words."

"Although Pang Gongping is not serious in his daily life, I think he should be a nostalgic person and treats people well."

Jin Fengniang said again: "Even so, if Ping Po doesn't want to do so, I can't force others to do anything."

Zhou Jun thought for a while and said, "It's better to do this. I'll take you and Pingpo to visit Mr. Pang tomorrow."

"You two masters and servants, you can meet Pang Gong first, and then make a decision."

Jin Fengniang thought about it and finally agreed.

After leaving Feng Niang, Zhou Jun rode back home on a horse. He first told his parents about what he had heard in Pang Mansion today, and then returned to his wing room.

As soon as Zhou Jun pushed open the door of the room, he saw Hua Yue running to the small room next to the front hall, closing the door tightly.

Zhou Jun looked at the small door and scratched his head helplessly.

After thinking about it, Zhou Jun walked to the door and said, "This morning, although Zhou was an unintentional act, it was indeed Meng Lang. I'm sorry for Huayue here. I hope you will ignore the past and be magnanimous."

After saying that, there was still no response on the other side of the door.

No?

How can we make Huayue calm?

It might be a way to divert attention.

When Zhou Jun thought of this, he took out a charcoal pen, found another piece of paper, and wrote the Arabic numerals from 0 to 9.

Then, he stuffed the paper through the crack of the door and asked, "In Huayue's hometown, can anyone use this number to count?"

After the paper was pulled in, after a while, Huayue gently replied: "No."

Zhou Jun was delighted. It seemed that he had done the right thing to talk about the calculation with Huayue.

Zhou Jun found another piece of paper, wrote the calculation method commonly used by the Tang Dynasty, stuffed it in from under the crack of the door, and said, "This is the calculation method we often use. If you compare the two, what is the difference?"

Huayue pulled the second piece of paper in. After a moment, she replied: "The number you gave for the first time is simpler, and the number corresponding to the calculation sheet is correct (0)."

Zhou Jun corrected her and said, "That is not called Circle, it is called Zero."

Painting Moon: "Zero? What is Zero?"

Zhou Jun: "Zero represents no, also known as empty set."

Huayue: "Oh, I understand. In the big food counting method, we draw 0 into a point, and in the Tang Dynasty calculation, 0 is a space."

Zhou Jun thought to himself, it seems that Dashi has not introduced Arabic numerals from India yet, and he still uses the old counting method.

Zhou Jun took out the third piece of paper, wrote down numbers such as 10, 20, 30, 100, 1000, 10,000 on the paper, and stuffed them into the crack of the door.

After Huayue looked at it, Zhou Jun said again: "Whether it is the Tang Dynasty's calculation of the scale or the big food number, once the number is 10, it will be inconvenient to count it."

"And the first number I just wrote is much more convenient, whether it is reading or calculating."

Huayue was on the other side of the door, looked carefully at the numbers on a few sheets of paper, and said slowly: "It's indeed much more convenient."

Zhou Jun said again: "I once read an oral formula at Sha Shiqing. Do you want to know what it is?"

Huayue was silent for a while and said a word softly: "Yes."

Zhou Jun sat upright on the stool and said to the door: "If you want to know, come out and talk. Don't you find it strange to talk through the door?"

There was no sound at the other end of the door for a long time. Just when Zhou Jun was disappointed and was about to give up, a gap opened in the small door.

Huayue carefully poked out half of her head and said to Zhou Jun: "Don't come over, light up the candlelight, I can see the words you wrote."

Zhou Jun held a charcoal pen and first wrote two symbols on the paper: x,÷.

Then, he pointed to the paper and said, "This is called multiplication, this is called division."

"Suppose the number before the multiplication sign is A and after it is B. Then the multiplication sign represents the multiplication of two numbers A and B. To further explain, there is A and B added..."

It took Zhou Jun a full two hours to explain the Nine-Nine Multiplication Table.

From the meaning of multiplication and division, to the yield equation, and then to the symmetry of the bit number.

At the end of the talk, Zhou Jun, who was asked by Huayue, gradually lost patience, simply told Huayue directly, just like a primary school teacher in his previous life, and just needed to memorize it by rote, and don’t worry about the principle.

After finally finishing the talk, Zhou Jun was already so tired that he couldn't open his eyes, so he went back to the house to rest first.

The next morning, he got up from the bed and walked to the front hall, but found Huayue lying on the ground and writing and drawing, with drafts of formulas spreading all over the floor.

Zhou Jun asked in surprise: "Can you not sleep all night?"

Huayue raised her head, her eyes were slightly black, but her expression on her face was very excited: "I used the Greek multiplication table to deduce it, proving that this nine-nine multiplication table is correct."

Zhou Jun thought to himself, of course it is correct.

Huayue said again: "I also used this multiplication table to solve the "Six Ring Large Number Problem" of the Babylonians and the "Hulagou Number Order" of the Egyptians. These two mathematical problems, even the mathematicians in my father's palace, were at a loss."

Zhou Jun, who had no idea what Huayue was saying at all, could only nod and smile politely.

Leaving Huayue, who was still fighting with the numbers, Zhou Jun arrived in front of the hall and rode his horse to the door of Jin Fengniang's mansion.

Pingpo waited at the gate early, saw Zhou Jun coming and bowed.

Jin Fengniang must have already mentioned that Mr. Pang bought a maid, but Zhou Jun could not see any sad and happy expressions on Pingpo's face.

Hearing the notice from his servant, Jin Fengniang, dressed in a generous dress, hurriedly walked out, and saw her dressed up carefully in gold and silver.

When he walked to Zhou Jun, Jin Fengniang deliberately turned around in the same place and asked with a smile: "How?"

Zhou Jun nodded and praised.

Seeing that Jin Fengniang entered the carriage first, Zhou Jun suddenly called Pingpo, who wanted to get on the car, and said, "It seems that something is missing... By the way, bring that pipa with you too."

Hearing this, Pingpo stood there, with a slight fluctuation in her expression.

Jin Fengniang poked her head out of the car and said, "Take it with you. The last time I heard Pingpo play the pipa, it seemed to be during the Lantern Festival."

Pingpo bowed slightly to Jinfeng Niang, went back to the small room, and took the pipa.

Seeing Ping Po holding the pipa in his arms get on the carriage, Zhou Jun rolled over the horse and said, "Let's go."
Chapter completed!