Guozijian, inside the mathematics hall.

Everyone focused their attention on Ke Shiqing, waiting for him to write a question.

"The student would like to ask the husband to work out a question within a quarter of an hour. The title is 1,352 times 2,781. What is the result?"

Ke Shiqing thought for a while and gave a multiplication problem with huge numbers.

"Heh~, with such a big number, it is estimated that it will take a day to count it with a counting chip?"

"Who said no, this Ke Shiqing's question is too ruthless."

.........

As early as the pre-Qin period, people learned to use counting chips for counting and multiplication. First put the multiplier on the top, and then put the multiplicand on the bottom, and align the last digit of the upper number with the first digit of the lower number. To the right, multiply the first digit of the upper number by the lower number, place the product of the multiplication in the middle of the upper and lower numbers, then remove the first digit of the upper number, move the lower number one place to the right, and then multiply the second digit of the upper number by the lower number Everyone, add the product in the middle and remove the second place from the top. Until the upper count is used up, the middle count is the result.

If Ke Shiqing's question is calculated with a calculator, it might really take a day to fiddle.

After listening to the questions, both Kong Yingda and Xu Hongzhi looked solemn and frowned.

Li Zexuan smiled relaxedly, and said indifferently: "Haha, what's so difficult? Ke Shiqing, you don't need me to do this question at all. My big disciple can do it for you, iron egg, come up and solve this question on the blackboard!"

This is the multiplication of two four-digit numbers. With Li Zexuan's current strong mental power, he doesn't need to use his hands at all, and he can deduce the answer directly in his mind. It is too challenging, so it is better to let the iron eggs practice.

"Yes, Master!"

Tie Dan walked from his seat to the blackboard, picked up a piece of chalk and used the elementary school mathematics knowledge Li Zexuan gave him, and began to calculate.

Last night, he and Lan'er discovered the novelty of chalk on the blackboard, but they had been scribbling on it for a long time, so it is not difficult for him to write on the blackboard.

"Hiss~ I heard it right? Mr. even said this question is simple?"

"Can his apprentice really do it?"

"Too arrogant!"

Ke Shiqing also frowned, secretly saying that the new gentleman is really a big tone. Right now, he stopped talking, and concentrated on looking at the iron egg on it to solve the problem, but he was confused by this look.

What is this black board? Why can I write on it? Why is the handwriting so clear? You can see it from so far away.

Also, what are the words written in the one called Iron Egg? How does it look like a ghost painting?

The rest of the people also discovered something was wrong, and they whispered and whispered.

"This black board is so amazing that it can be used for writing. Then, if we can listen to and read the lectures, it will be more convenient for us to take notes!"

"Yes, my husband spoke too fast before, and I can't remember it at all. With this thing, I can definitely learn better. I now hope that my husband can beat Ke Shiqing so that my husband doesn't have to leave."

"Hey, look at what the kid wrote? Why don't I know?"

"Uh, I don't know either, how come it looks like a ghost painting!"

..........

Kong Yingda saw Tie Dan writing and drawing on the blackboard, and instantly understood what Li Zexuan had said outside the teaching house that would make students do more with less. He has taught books for many years, so he just glanced at it. I can see that the blackboard teaching is much better than the previous lectures on the books.

Kong Yingda was extremely excited, secretly saying that such a good thing, the Imperial College had to equip all the teaching houses with a set, and I had to ask Li Zexuan to ask for a batch.

When he looked at the characters written by Tie Dan, he couldn't help frowning, thinking: Is it possible that Li Zexuan, who is a master, hasn't taught this kid to write before? How can it be written crookedly? I can't recognize it at all!

Xu Hongzhi had seen this kind of word last time, but his heart was still shocked at the moment. He didn't expect Li Zexuan to have the confidence to calculate such a huge multiplication problem with his strange words.

Time passed by one minute and one second, probably less than a quarter of an hour later, almost equivalent to four or five minutes in modern times. The iron egg had left seven rows of Arabic numerals on the blackboard, and he had already calculated the result. He was still a little worried. , Rechecked the calculations again, and found that the results were the same twice, then turned around and said to Li Zexuan:

"Master, the iron egg has calculated it, and the answer is three hundred and seventy-five thousand nine hundred and twelve."

After listening, Li Zexuan nodded slightly. He had calculated in his heart that it was indeed the answer.

"Mumbling..."

The sound of drooling below, even though they don’t know if the result is correct, they are shocked by such a huge number. They really can’t understand how such a big number is calculated in such a short time. from.

"Well, Tiedan, you can sit back first! Ke Shiqing, what, this answer is incorrect?"

Li Zexuan smiled and asked Ke Shiqing.

Ke Shiqing looked shocked and couldn't believe it since he heard the answer from Tie Dan. When he heard Li Zexuan ask him, he then came to his senses, bowed seriously to Li Zexuan, and said:

"Mr. Hui, the answer to this question is indeed this. It’s just that the students really don’t understand why the iron egg can be calculated in half an hour, but the students don’t understand. Algorithm, students are willing to pay any price!"

As soon as Ke Shiqing finished speaking, the audience exploded.

"Hey~ it's right!"

"It's incredible. Multiplying such a huge number can be calculated in less than a quarter of an hour. Is this new gentleman the reincarnation of a god? How is the disciple taught so powerful!"

"It must be the reincarnation of the gods, great, I will be able to listen to classes in my husband's classroom in the future, and I will be able to learn this magical algorithm!"

"If I can learn this algorithm, I will definitely be able to enter the four academies next year!"

"Even the brothers in the four schools are not so good!"

………

Both Kong Yingda and Xu Hongzhi's eyes widened, and they almost pulled off their beards.

Li Zexuan pressed his hands towards the void below, and everyone immediately became quiet, all looking at him.

"Shiqing, have you seen these seven lines on the blackboard? This weird little character is a simpler counting method I invented. As for the calculation process, it is also very simple. I will explain it to you in the future. Then. Now, is there anyone else you want to ask a question? Please hurry up!"

Li Zexuan took a branch, which he casually folded in the Imperial College before he came. While pointing at the calculation trace left by the iron egg on the blackboard with the branch, he gave Ke Shiqing a general explanation.

Arabic numerals were originally invented by the ancient Indians. Later, after 700 AD, the Arabs conquered the Punjab region and arrested a mathematician in northern India. The Indian counting methods and mathematical symbols were only learned by the Arabs. And spread to Europe, and later modernized by Europeans.

At this moment in the Zhenguan period, there were no Arabic numerals in the whole world. Li Zexuan only thought of such a thing later, so it is not wrong for him to say that this thing was invented by himself at this moment.

Ke Shiqing was very excited when he heard that he would have the opportunity to learn this advanced algorithm from Li Zexuan in the future. He respectfully bowed to Li Zexuan and said, "Thank you, Mr., for your teaching. The students have no doubts. Mr. took a different approach and became his own family. The accomplishments in the field of mathematics are beyond the reach of students!"

Kong Yingda and Xu Hongzhi looked at each other, and both could see a hint of horror in each other's eyes. They created their own school and said it was easy, but it is not easy to construct a complete and rigorous doctrine system.

Throughout the ages ~lightnovelpub.net~ people who can create their own school and form a family are all great masters of celebrities and even great saints! For example, Confucius, Laozi and others. If Li Zexuan’s self-made doctrine can stand up to his studies, I am afraid he will become a saint in the future!

Could this be the prosperous age, the saint coming out?

Li Zexuan was complimented by Ke Shiqing a bit darkly. He waved his hand and smiled: "Well, everyone has any questions as soon as possible. No questions, then I will officially start class!"

The rest of the students looked at each other, Li Zexuan's apprentices are so powerful, how dare they go out to find abuse! Therefore, Li Zexuan waited for a long time and no one came up to ask questions. He was about to start the formal class when he heard a loud voice coming from outside the house.

"Haha, this king has a question, please ask Dr. Li to solve it!"

……………

Thank you Tianqian Zhiyu, Xiaoyao Xiongge, Niuniu for your rewards, thank you for the monthly pass of Changle, and thank you for your recommendation votes.

(End of this chapter)