In ancient times, mathematics was called arithmetic or arithmetic. It was one of the six arts of the Four Books, Five Classics, and Six Arts.
In ancient times, mathematics was very developed, and the imperial power also valued mathematicians very much.
In the Tang Imperial College, the mathematics department had a mathematics doctor and teaching assistant!
In fact, there was even a special assessment for mathematics in the Jinshi examination.
However, mathematics was not an ordinary subject. Ordinary private schools would not teach mathematics.
Even the simplest multiplication table was in Xunzi and not in a book.
In addition, the Great Tang did not have an abacus and relied on counting sticks, which greatly increased the difficulty of learning.
But now, a former bandit den, now a small village, actually had a private school!
Moreover, there was actually someone teaching mathematics in the private school!
This surprised Li Shimin and Du Ruhui.
Thinking of the various things in the village, the two of them were certain that there was definitely an expert in the private school. Otherwise, how could a thief like Chu Han manage the village so well?
And the sweet potatoes and farming tools might have been invented by this expert, but the results were taken away by Chu Han!
For a moment, the image of a master like Zhuge Kongming appeared in Li Shimin's mind.
Li Shi Min's footsteps quickened as he thought of this.
However, hope was like a bubble. After a flash of brilliance, it was instantly shattered.
Because when the two of them walked into the private school, they realized that the person teaching was not some white-haired and ruddy teacher, but a young man!
"Ah ~"
Disappointment was written on their faces.
The two people who suddenly walked in also attracted the young man's attention.
"What are you doing here?" he asked.”
"Old Master and I heard the sound of reading, so we came over to take a look.”
The young man smiled." Then you're lucky. Today, I'll be teaching my child new knowledge from my teacher!"”
Li Shi Min's eyes lit up and he immediately asked,"You have a teacher? Who is your teacher?"
The young man took a step back in fear and said weakly,""Why are you asking this?"
“...”
Li Shi Min looked at the wary young man and hesitated for a moment. Since this master asked the students to teach, perhaps he did not want to see the secular people.
If he asked rashly, he might make the other party feel disgusted.
Du Ruhui saw that the Emperor did not speak, so he naturally did not speak either. He began to size up the private school.
Soon, he saw the book in the young man's hand and was immediately attracted.
"What are the crooked symbols on it?”
Du Ruhui pointed at the book and asked.
The young man glanced at the book and said,""This is a number invented by my teacher!”
Numbers?
Li Shi Min curiously leaned over and asked,""What's with this number?”
The young man seemed to have taught too much. He picked up the book with ease and pointed at the numbers to teach.
"This is 1, this is 2…When they were randomly combined, they would become new numbers, such as 12 and 71. When combined with the nine-nine formula, it would be especially easy to memorize!”
"Ever since this number came into existence, the copycats haven't used any counting sticks!”
...
Li Shi Min and Li Shi Min were both shocked!
This number was a good thing!
It was countless times more convenient than counting sticks!
One of them was the Emperor, and the other was the Minister of War. Naturally, they knew the importance of numbers. For example, when calculating military supplies, rations, and other things, they could easily record a clear number!
The person who invented this thing was definitely an expert!
Li Shimin had sharp eyes. He also noticed that there were many algorithms written in this book, many of which he had never seen before.
This book is knowledgeable!
"What's this?" he asked, pointing at a vertical one.”
Seeing this, the young man said," This is a vertical algorithm. Because numbers are different from counting rods, they also have their own unique calculation method. For example, this is 22 x 32. Multiply and add in order to get 704!”
！
Li Shimin and Du Ruhui were even more shocked.
This method was good!
It was countless times more powerful than counting rods!
His calculations were quick and concise!
Moreover, the two of them observed around and found that the children in this private school seemed to have already skillfully used the vertical algorithm.
Li Shimin suddenly had a thought. Who invented this algorithm?
Just as he was about to ask, a voice came from outside the door.
"So you guys are here! Let's go! It's almost time to eat. Don't disturb these children from studying!”
It was Tiger. After he finished speaking, he walked up and urged Li Shiming and Li Li Yi to leave.
Li Shi Min was helpless. He looked at the book in the young man's hand reluctantly and left.
However, Du Ruhui's eyes were sharp and his hands were fast. He took a book and hid it in his arms.
After the two of them returned to the guest room, Li Shiming said with some frustration,"It's a pity that I didn't get that book. Otherwise, if I handed it over to the doctors in the directorate, they would probably be able to research a lot of things!”
"Your Majesty, what do you think this is?" Du Ruhui smiled mysteriously.”
As he spoke, he took out a book from his pocket.
Li Shi Min was delighted and looked down.
The original name of the book was Encyclopedic Enlightenment!
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