Imperial College, inside the Arithmetic School.
Everyone focused their attention on Ke Shiqing, waiting for him to give the question.
"The students would like to ask you, sir, to solve a problem within a quarter of an hour. The problem is one thousand, three hundred and fifty-two times two thousand, seven hundred and eighty-one. What is the result?"
Ke Shiqing thought for a while and gave a multiplication problem with a huge number.
"Hi~, for such a big number, it would probably take a whole day to calculate it, right?"
"Who says it's not the case? Ke Shiqing's question is too cruel."
... ... ... ...
As early as the pre-Qin period, people learned to use arithmetic chips for counting and multiplication calculations. First, place the multiplier on top, then place the multiplicand on the bottom, and align the last digit of the upper number with the first digit of the lower number. Press from left to right. In order to the right, use the first digit of the upper number to multiply the lower digits, place the product between 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 Guys, add the middle product and drop the second digit from the top. Until the upper number is used up, the middle number is the result.
If Ke Shiqing's question was calculated with a calculation chip, it might take a whole day of fiddling.
After listening to the questions, Kong Yingda and Xu Hongzhi both looked solemn and frowned.
Li Zexuan smiled easily and said nonchalantly: "Haha, why is this difficult? Ke Shiqing, you don't need me to solve this problem at all. My senior disciple can do it for you. Tiedan, come up and solve this problem on the blackboard!"
This is the multiplication of two four-digit numbers. With Li Zexuan's current strong mental power, he can deduce the answer directly in his mind without using his hands at all. It is really not challenging, so it is better to let Tiedan practice.
"Yes, Master!"
Tiedan walked from his seat to the blackboard, picked up a piece of chalk, and started to calculate using the elementary school mathematics knowledge Li Zexuan gave him.
He and Lan'er discovered the novel blackboard chalk last night, but they had been scribbling on it for a long time, so it was not difficult for him to write on the blackboard now.
"Hiss~ Did I hear you correctly? Sir, you actually said this question is easy?"
"Can his apprentice really do it?"
"Too arrogant!"
Ke Shiqing also frowned, secretly thinking that this new gentleman has such a strong tone. He stopped talking at that moment and concentrated on looking at the iron egg above to solve the problem. But just by looking at it, he was confused.
What is this black board? Why can I write on it? Why is the handwriting so clear? You can see it from this far away.
Also, what are the characters called Tiedan? Why does it look like a ghost painting
The rest of the people also noticed something was wrong, and they all whispered to each other.
"This black board is so magical. It can be used to write on. In this way, when Mr. gives lectures in the future, we can listen and read at the same time, and it will be more convenient to take notes!"
"Yes, my husband used to speak too fast and I couldn't remember it at all. With this thing, I will definitely learn better. Now I hope that my husband can be better than Ke Shiqing, so that my husband doesn't have to leave."
"Hey, look at what that kid wrote? Why don't I recognize it?"
"Uh, I don't know him either, why does it look like a ghost drawing amulet!"
... ... ... .
When Kong Yingda saw Tiedan writing and drawing on the blackboard, he immediately understood what Li Zexuan had said outside the classroom before that could help students get twice the result with half the effort. He had taught for countless years in his life, so he knew it at a glance. I can see that the blackboard lectures are much more effective than the previous lectures he gave in front of books.
Kong Yingda was extremely excited and secretly thought that with such a good thing, the Imperial College must provide a set for all teaching buildings, and he would have to ask Li Zexuan for a batch later.
When he looked at Tiedan's writing, he couldn't help but frown, thinking: Could it be that Li Zexuan, the master, had never taught this child to write before? Why is it written so crookedly that I can’t even recognize it!
Xu Hongzhi had seen such characters last time, but at this moment he was still shocked. He did not expect that Li Zexuan would have the confidence to calculate such a huge multiplication problem with his strange characters.
Time passed by minute by second, and less than half a quarter of an hour passed, which was almost equivalent to four or five minutes in modern times. Tiedan left seven lines of Arabic numerals on the blackboard. He had already calculated the result, and he was still a little worried. , checked the calculation again, and found that the results were the same twice, then turned to Li Zexuan and said:
"Master, Tiedan has calculated it. The answer is 3,759,912."
After listening, Li Zexuan nodded slightly. He had calculated in his mind that this was indeed the answer.
"Mumbling..."
There were sounds of swallowing below. Even though they didn't know whether this result was correct or not, such a huge number frightened them. They really couldn't understand how Tiedan calculated such a huge number in such a short time. from.
"Well, Tiedan, please sit back first! Ke Shiqing, what do you think? Is this answer correct?"
Li Zexuan smiled, looked at Ke Shiqing and asked.
Ke Shiqing was shocked and in disbelief after hearing Tiedan's answer. When he heard Li Zexuan ask him, he finally came to his senses, bowed deeply to Li Zexuan seriously, and said:
"Replying to sir, the answer to this question is indeed this, but the students really don't understand why Tiedan can calculate the question in half a quarter of an hour when it took me a whole day to calculate it. Please teach me this efficient method, sir. Algorithms, students are willing to pay any price!”
As soon as Ke Shiqing finished speaking, the audience exploded.
"Hi~ I actually got it right!"
"It's incredible. The multiplication of such huge numbers can be calculated in less than half a quarter of an hour. Is our new gentleman the reincarnation of a god? How come the disciples he teaches are so powerful!"
"It must be the reincarnation of a god. It's great. I can attend lectures in front of my husband in the future and learn this magical algorithm!"
"If I can learn this algorithm, I will definitely be able to enter four schools next year!"
"Not even the senior brothers from the Four Schools are so powerful!"
… …
Both Kong Yingda and Xu Hongzhi's eyes widened and they almost pulled off their beards.
Li Zexuan pressed his hands into the void below. Everyone immediately fell silent and turned their attention to him.
"Shiqing, have you seen these seven lines of characters 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. So. Now, do any of you have any questions? If you want to ask questions, hurry up!"
Li Zexuan took a branch, which he had randomly folded in the Imperial College before coming. He pointed the branch at the calculation traces left by the iron egg on the blackboard, and gave Ke Shiqing a rough explanation.
Arabic numerals were originally invented by ancient Indians. Later, after 700 AD, the Arabs conquered the Punjab region and captured a mathematician from northern India. The Indian counting methods and mathematical symbols were learned by the Arabs. And spread to Europe, and then Europeans modernized it.
At this moment during the Zhenguan period, the entire world did not have Arabic numerals. Li Zexuan only came up with such an idea later, so it is not wrong for him to say that he invented this thing at this moment.
When Ke Shiqing heard that he would have the opportunity to learn such a profound algorithm from Li Zexuan in the future, he couldn't help but be extremely excited. He bowed respectfully to Li Zexuan and said, "Thank you sir for your teaching. The student has no doubts. Sir, he has found a new way and is in his own way. In terms of attainments in the field of arithmetic, students are beyond reach!"
Kong Yingda and Xu Hongzhi looked at each other, and they could see a hint of horror in each other's eyes. Creating a school of their own was easy, but constructing a complete and rigorous system of doctrine was much easier said than done.
Throughout the ages, those who have been able to create their own sect and family are all great masters and even great saints who have been famous throughout the ages! For example, Confucius, Laozi and others. If Li Zexuan's self-created theory can stand up to scrutiny, I'm afraid he will become a saint in the future!
Is this the emergence of a prosperous age and the emergence of saints
Li Zexuan was a little happy to be complimented by Ke Shiqing. He waved his hands and said with a smile: "Okay, if you have any questions, please ask them as soon as possible. If there are no questions, then I will start the formal class!"
The other students looked at each other in shock. Li Zexuan's apprentices were so powerful, how could they dare to go out to seek abuse again? So, Li Zexuan waited for a long time but no one got up to ask questions. He was about to start the formal class when he heard a loud voice coming from outside the room.
"Haha, I have a question, and I would like Dr. Li to answer it!"
… … …
Thank you Tianqian Zhiyu, Xiaoyao Xiongge, and Niu Niu for your rewards. Thank you for your monthly votes. Thank you for your recommendation votes.
(End of chapter)