Li Tai took Li Tianming alone and walked leisurely towards the school. There was no TV during the Zhenguan period of the Tang Dynasty, so most of the people still didn't know Li Tai.

So even if Li Tai swaggers down the street, as long as there are no honor guards and guards. Absolutely few people would have guessed that this was the famous Yan Wang Li Tai.

When Li Tai came to the school, he heard the sound of neat reading from the school. This can't help but remind Li Tai of the scene he read early when he was studying.

So Li Tai slowly walked into the school and stayed outside each classroom for a while. Some classrooms are reading aloud texts, while others are learning the phonetic alphabet.

Don't forget that this pinyin alphabet was created by Li Tai. Although Li Tai only plagiarized the achievements of later generations, no one knew about it during the Zhenguan period of the Tang Dynasty. They only think that Li Tai has the talent of heaven and earth, otherwise they will definitely not be able to make such a magical thing.

After looking at several classrooms in a row, Li Tai stopped outside one of them. Children are being taught arithmetic in this classroom.

But no matter how the teacher spoke, some students still had a blank look on their faces. They can't even comprehend the simplest method of addition and subtraction.

This couldn't help but surprise Li Tai, so Li Tai knocked lightly on the classroom door. Soon the teacher in the classroom opened the door of the classroom for Li Tai.

The teacher in the classroom naturally didn't recognize Li Tai, so he opened his mouth and said to Li Tai: "We are in class, what is the matter with you?" ”

"This teacher, I'm just going to the school with nothing to do. I just saw you teach children math, but there are a lot of children who can't understand it at all, so I just walked in. ”

"Most of these children come from poor families and have never been exposed to these things since they were young. Although it has been sent to the school now, I have learned a lot of simple words. But the calculations are just not masterable. The teacher also sighed and said to Li Tai.

So Li Tai called out to a student with a stunned face. He asked the student, "Is math really that hard?" Why can't you understand what the teacher is saying? ”

"Big brother, I only have ten fingers. So as long as the two numbers add up to ten, I can't count them with my fingers. The student stretched out his hands and said to Li Tai.

Hearing this student say this, Li Tai suddenly thought of something. So from Li Tianming's body, dozens of copper coins were asked.

Then he put the coins on the table and said to the student, "You can try them and see if you can add or subtract these numbers." ”

The student nodded, and counted the copper coins on the table one by one. Sure enough, the arithmetic problems that the teacher wrote on the blackboard. It was all very easy for this student to say.

Seeing the happy expression on the student's face, the teacher on the side said excitedly to Li Tai: "Childe uses this copper coin to calculate, which is a good way." It seems that the school should prepare some preparations for the children. ”

In fact, Li Tai's method of calculating with copper coins was already thought of by the ancients. And choose to use a more inexpensive and convenient bamboo skewer or wooden skewer. Historically, it was called arithmetic.

However, if these children are allowed to carry these calculations on their backs and keep fiddling with them every day, Li Tai feels that it is very impractical. And if the number is too large, even if it is calculated, it cannot be calculated.

Although now Li Tai has begun to implement the flying bear day calculation, that is, Arabic numerals. While this makes the calculations easier, it's also not accessible to everyone.

After Li Tai left the school, he took Li Tianming back to Yanwang's Mansion directly. After returning to Yanwang's Mansion, Li Tai did not go back to the Inner Mansion, but went directly to the Tiangong Pavilion in Gaoping.

All the important departments in Youzhou are all in this Yanwang Mansion. Of course, this Tiangong Pavilion is only a research and development department, and the production department naturally cannot be in the Yanwang Mansion.

Li Tai entered the Tiangong Pavilion and directly called Gao Ping over. When Gao Ping heard that Li Tai was coming, he hurriedly greeted him.

After saluting Li Tai, Gao Ping said to Li Tai: "How can the lord have time to come to Tiangong Pavilion today, is it possible that he has any whimsical ideas, and he has to explain to his subordinates?" ”

Every time Li Tai came to Tiangong Pavilion, he would bring his own whimsical ideas. In fact, only Li Tai himself knows that these are just plagiarized by him.

Li Tai nodded and said, "Today I saw the children in the school, and it was very difficult to count them. So Ben Wang thought of a calculation tool. ”

"Go and get a pen and paper, and the king will draw it for you in detail. It's best to make a sample for the king right away. ”

When Gao Ping heard Li Tai's words, he didn't dare to slack off in the slightest. Immediately, he ordered someone to take a pen and straw paper, and asked Li Tai to draw the calculation tool he had said.

Nowadays, all Yan officials, unless they practice calligraphy, use a brush. This pen is used for other writing records, which not only greatly improves the speed of writing records. At the same time, the accuracy rate is greatly improved.

Li Tai picked up the pen and sketched a few casually on the straw paper. The shape of the abacus was outlined, and then directly handed it to Gao Ping.

Gao Ping took the drawings and looked at them, and said to Li Tai with a smile: "The design of the lord is simple today, please wait for a while." The subordinates can make it for the lord immediately. ”

After all, there is no too cumbersome process to make this abacus. So it didn't take long for Gao Ping to make an abacus.

Gao Ping handed the abacus into Li Tai's hands and asked, "Lord, I don't know what this thing is called, what is it for?" How can I help my kids calculate? ”

Li Tai took the abacus handed over by Gao Ping and placed it flat on the table. Then he said to Gao Ping: "This king calls it an abacus, with it, children are learning to calculate, it is not so difficult." ”

Then Li Tai explained the use of this abacus to Gao Ping in detail. When Gao Ping understood the way to use this abacus. I couldn't help but show admiration on my face.

So he opened his mouth and said to Li Tai: "Lord, with this abacus, not only is it easier for the children to calculate. Even when businessmen do business, it is much more convenient. This is definitely an invention for the benefit of the country and the people. ”

"Immediately let the factory make this abacus for the king. This king will be distributed to every student in a short time. However, the volume of this abacus should be reduced as much as possible, so as not to be less convenient to carry. Li Tai opened his mouth and said to Gao Ping.

"Please rest assured, in a few days, the subordinates will let the lord see that the students are using the abacus. At the same time, subordinates will mass-produce this abacus and then put it into the thirty-three heavens to sell. Gao Ping said to Li Tai.

"It is said that this king is as rich as his life, and he will think about making money in whatever he does. I don't think you're any worse than this king, and you're definitely better than that. Li Tai said to Gao Ping with a smile.

"My lord, I'm afraid this is what the old saying goes, what kind of lord there is, what kind of servant there is." Gao Ping said to Li Tai with a smile on his face.

(End of chapter)