Qiao Xin was in Lu Yao's cave, counting the dried meat brought back from the last hunt and the crops harvested this time. Lu Yao was holding his knots of different colors and reciting numbers.

Qiao Xin was holding a wooden abacus and plucking it, much faster than Lu Yao's knot, as if one was riding a children's bicycle and the other was driving a sports car.

Every time the students next to Lu Yao heard the sound of the abacus being counted, their hearts couldn't help but tremble. The knots in their hands were almost pulled straight. They couldn't catch up with Qiao Xin's speed. Not to mention Qiao Xin, they couldn't even keep up with Leopard Star's speed.

Several people secretly looked at Lu Yao with grievance. Wu was too stubborn. He had to argue with Lady Qiao Xin. They each used their own methods to argue with each other. Now, after sweating profusely, he still couldn't calculate one tenth of what the other person did.

They also learned addition, subtraction, multiplication and division taught by Master Qiao Xin, but their skills were not as good as Leopard Star. However, Leopard Star was not considered to be Wu's real student.

Before we knew it, the teams were divided into three competition teams, and it was obvious that the thing called abacus that Qiao Xin held won.

While calculating, Leopard Star glanced at the abacus in Qiao Xin's hand from time to time, and was obviously very interested.

After Qiao Xin pulled out the last bead, she counted the items with a snap. "I've counted them. There are 5629 animal skins, 13002 pieces of dried meat, 2538 baskets of chestnuts and potatoes, 2110 baskets of wheat, 500 baskets of corn kernels, and about 6194 baskets of unpeeled corn cobs."

As soon as the crisp sound of the abacus stopped, everyone in the cave breathed a sigh of relief.

A small portion of this food was stored in warehouses, but most of it was piled up in the square. Some were covered with plastic sheets, and some were covered with straw mats. The warehouses were filled to the brim, and everyone who passed by felt a surge of sense of security when they saw so much food.

This is the sense of security that the tribe gives them.

Lu Yao just raised his eyes slightly to glance at Qiao Xin and continued to calculate. Several of his students also continued.

No one knew what he was thinking in his heart. He had not yet fully learned arithmetic, and as a result, Qiao Xin, that dishonest fellow, started to make some calculations again. Lu Yao wanted to avenge his previous humiliation, but the rope arithmetic passed down from his ancestors was not effective.

Qiao Xin stood up and did a few swallow flying poses to stretch her muscles. "I'm going to go check the construction site. I've written the results on the board. You guys can calculate them in pairs. I'm leaving first."

Qiao Xin disappeared like the wind, leaving the people in the cave to continue calculating.

Qiao Xin went home, carried a one-meter-square wooden board, and ran to the back mountain to find Lang Zheng.

The wolf saw her from a distance and kept looking for a place to hide.

Qiao Xin shouted from a distance, "I saw you, there's no point in hiding."

Qiao Xin was amused. Didn't she just ask him to discuss how to build a warehouse? As for avoiding her?

Didn't Lang Rui also improve through continuous learning and now he can offer suggestions in all aspects?

The construction of the warehouse is similar to that of the dormitory, the only difference is that Qiao Xin wants to build a basement, which is mainly used to store crops such as cabbage roots in winter.

The wolf was watching the whole process of Qiao Xin's sketching out this magical underground building, the warehouse. However, to witness the birth of this magical thing, he had to accept all kinds of explanations from Qiao Xin, as well as contemptuous looks. In the end, Qiao Xin was almost roaring.

The moment the blueprint came out, the wolf felt that he was not only sublimated but also liberated.

No matter what, he would not stay in the tribe to suffer this next time. This kind of good thing must be let others taste it.

The wolf no longer hid and stood there, waiting for Qiao Xin.

When Qiao Xin arrived, she pushed the board in front of him and said, "I don't need to explain! Lang Zheng, work hard and give our tribe's food a home. We must find a way to make it. Our food can't withstand another rain."

Even though the food was covered, it still got damp to some extent. If it rained for half a month, it would not be able to survive.

Langzheng's face straightened and he took the board solemnly, "I will definitely rush it out as soon as possible."

Qiao Xin had already chosen the location, which is just to the left of the cave where they currently live. In the future, everyone will move to the living area on the other side of the dormitory. The stone mountain where they currently live will be leveled, and the administrative center of the tribe will be built behind the square, followed by some entertainment areas such as hotels and pedestrian streets, and small parks and green belts to separate them from the living area.

As for industrial textiles such as tile kilns, iron smelting furnaces, blacksmithing spinning mills, and textile companies, they may be moved out in the later stage, and it would be best to build them outside the city, where there are rivers.

After Lang Zheng took over the drawings, since he had watched and learned from Qiao Xin's creation in the early stages, although there were some bumps and bruises while building the warehouse, it was completed smoothly. This time, they directly repaired the main beams of the building first, plus the basement, for a total of six floors.

All the main load-bearing beams are reinforced with steel bars, which are directly melted and formed by Langxue using molds and blast furnaces.

Lang Zheng and Lang Xue followed behind Qiao Xin and grew rapidly.

Qiao Xin was willing to teach, Lang Xue was willing to learn, and Lang Zheng was forced to learn. No matter what, the two of them learned a lot.

However, unlike Wolf Xue’s excitement about learning new things, Wolf Zheng was so tired that he did not get enough sleep every day. In the past, he would lie down and sleep until dawn, but now he would always wake up suddenly in the middle of the night. He always felt like someone was holding a whip and urging him to go faster and faster, and learn more and more.

After five days, Lu Yao's rope calculation had already counted the warehouse, and the data he calculated was exactly the same as the data calculated by Qiao Xin using the abacus in one meal's time.

It is exactly the same as what Leopard Star calculated.

Leopard Star used addition, subtraction and division and it only took him a few more meals than Qiao Xin, but it took him several days.

This made Lu Yao deeply realize the shortcomings of his algorithm, and he had to admit that the arithmetic taught by Qiao Xin was very impressive.

He decided to spend more time and energy on studying. Otherwise, as the amount of food in the tribe increased, his counting speed would not be able to keep up with the speed at which the food entered the warehouse. If he couldn't calculate clearly, there would be chaos. He would never allow this to happen.

Leopard Star didn't care about all this. He knew that Qiao Xin had finished her work, so he came to her house holding the abacus she had left in Wushan Cave, "Master Qiao Xin." He was very respectful and well-behaved.

Qiao Xin knew that he was a bit of a black-bellied person, always colluding with Lang Yu behind the scenes, giving advice and doing bad things, so she didn't believe his superficial obedience, "Want to learn?"

Leopard Star nodded wildly, "Master Qiao Xin, I will study hard."

Qiao Xin had been waiting for him. She took out the formula she had written down earlier and said, "Come here. You know all the words, right? Read it for me."

Leopardstar came in and began to read from the board, "One up, one, two up, two, ... one down, five down, four down, ... two down, eight up, one ... "

He read it, and Qiao Xin's fingers demonstrated it on the abacus.

Lang Yu saw Bao Xing going to find Qiao Xin from afar at his doorstep. He was about to run out but was stopped by Bai Ru, "The tribe leader is out. Qiao Xin is very busy these days. Don't disturb her." Qiao Xin trained with the tribe members every morning, went to the fields in the morning, and went to the construction site in the afternoon. She was busy like a top.

Lang Yu pouted and said, "Bao Xingxing has gone, so I want to go too."

Bai Ru rolled her eyes at him, "Leopard Star is going there to study, are you?"

Lang Yu's face turned red, but he didn't say a word. I also went to study, "I'm still young, I can't pull up the seedlings."

Bai Ru laughed wildly. Her cub was her entertainment. "That's called forcing growth. You think you are too young now. When you go out hunting and run in the front, why don't you say you are too young?"

Lang Yu hugged his little arms and groaned, still wanting to go out to play, but it was dark and his mother wouldn't let him.

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