Tang Dynasty: The beginning of the game is to touch the Princess Changle

*Do not replace official history, thank you for your support.

*Nine Chapters on the Mathematical Art was supplemented in the Han Dynasty, and the Nine Nines Formula Table existed in the pre-Qin Dynasty!

When Li Shimin returned to the palace, he brought back half a pig.

Su Chen also cut the other half of the pork ribs for Li Shimin to take back.

It's a pity that the ingredients are not complete, otherwise the braised pig head would be very fragrant.

Now we can only make boneless meat.

Little Li Zhi and Little Persimmon, the two children were at the table before, and they loved the braised pork ribs.

Moved two boxes of Wangzai for the two children.

If there is no more in the future, Su Chen doesn't know what to do.

...

Two days later, early in the morning.

A carriage stopped at the entrance of the manor, with more than 60 soldiers accompanying for protection.

Six people got off the carriage, Princess Changle and her two best friends, Little Li Zhi, Little Persimmon and Jin'er.

Now that the identity has been revealed, the guards no longer need to hide in the dark, they just need to change into casual clothes.

Six people came to the living room and looked at the scene in the living room in confusion.

Su Chen saw them, smiled and nodded, and then stopped greeting them.

They each found a place and sat down to see what Su Chen and the others were going to do.

Including the six of them, there were a total of 18 people sitting below.

Su Chen faced everyone and pointed to a wooden board with ten traditional Chinese characters. "From today on, you don't need to train anymore, just learn this."

A large wooden board painted black was placed in the living room, and all the seats were adjusted in direction. Rows of them faced one direction, just like a classroom class.

The wooden board was made by a carpenter in the village yesterday, and 136 small rectangular blocks were made.

Su Chen made some chalk with lime.

Those words were written by Su Chen with chalk, in running script.

But no one would think that those words were written by Su Chen. In their impression, Su Chen could not write.

Everyone was very curious about what was used to write the words on it.

"Su Chen, we have already learned those things, even the masters can do it."

Chang Sun Chong said to Su Chen with a smile, and did not forget to use someone as an example.

Su Chen did not care, and smiled lightly, "Oh, really? Then Chang Sun Chong, come up, let's have a competition."

Chang Sun Chong walked to the wooden board without any pressure.

He heard his father Chang Sun Wuji say something about Su Chen, who was not good at math.

"King Wei, you come up with the questions, and Chang Sun Chong and I will calculate." Su Chen looked at Li Tai and said.

"Su Chen, call me Li Tai outside the palace in the future, it's more pleasant to the ear."

After Li Tai finished speaking, he looked at the others and added, "It's the same for everyone."

Su Chen smiled and nodded, thinking: The fourth son of Emperor Taizong of Tang, Li Tai loved literature, and wrote "Guo Di Zhi" to calculate the height.

Then, Li Tai slowly read out the question:

"Twenty-six thousand three hundred and seventy-nine, plus nine thousand five hundred and forty-eight (26379+9548), both of you start calculating."

Su Chen did not calculate, he was looking at Chang Sun Chong.

Chang Sun Chong was calculating silently.

Everyone felt strange, why did Su Chen not calculate but look at Chang Sun Chong?

After waiting for half a cup of tea, Su Chen turned to the blackboard and wrote out the vertical formula with chalk.

"I will start calculating."

It is Arabic numerals (hereinafter referred to as lowercase numerals).

The answer was given quickly, and the corresponding uppercase numeral was written under the lowercase numeral.

Li Tai said several questions in succession, and Su Chen could give the answer quickly.

They also found that Su Chen was not unable to write, but he could not write with a brush.

Li Tai did not have the answer to these questions either.

Later, Li Tai spent about ten minutes to verify Su Chen's answer.

All of them were correct.

"Su Chen, why can you calculate the correct answer so quickly?"

Their calculation method is to use counting rods, which are small wooden sticks of similar size.

Two or three hundred sticks are placed in a bag and taken out when they need to calculate.

And there is no multiplication and division.

"This is what I want to teach you, Changsun Chong, Li Tai, Du He, Fang Jun, Wei Shuyu.

You five, learn it as quickly as possible. There are important things for you to do, and others can learn it if they can."

Su Chen said to him very seriously.

"Okay, Su Chen, please start teaching us now."

Li Tai actually bowed his hands and bowed to Su Chen, and the others followed suit.

"Li Tai, didn't you just say that? In the future, we won't use these heavy gifts when we are outside.

Now, let me tell you about this number. From now on, we will call it:

Lowercase numbers, which are convenient for calculation and accounting."

Su Chen turned around and wiped all the words on the blackboard with a piece of cloth.

Only the top ten capital numbers, zero to nine, are left.

Below them, write the corresponding lowercase numbers.

"The lowercase numbers are read the same way as the uppercase numbers. Do you understand?"

"Yes!"Su Chen nodded and wrote a vertical addition formula with lowercase numbers.

17+16

"Li Tai, if it was you before, how would you calculate this?"

Li Tai stood up and answered: "If it's simple, you can calculate it in your mind, and if it's complicated, you need to use counting rods."

Su Chen nodded and asked him to sit down.

"No need in the future, you can see..."

So, Su Chen taught all of them simple addition and subtraction slowly, just like teaching first graders.

How to carry and how to borrow.

...

More than half an hour later.

"Now, do you understand it?"

Finally, everyone answered, "I understand!".

Su Chen was worried, so he asked Da Niu to come up and see the effect. Da Niu was recognized by them as the one in the back row.

Thank God, thank the earth, Da Niu really learned it, and the five-digit addition and subtraction were all correct.

"Imperial Academy, if you had taught me this earlier, I wouldn't have been beaten so many times in vain. It's not that I can't learn, it's that they can't teach."

Daniu finally vented all the grievances of the past ten years.

"Hahaha!"

Everyone laughed, not at Daniel, but happy to learn something new.

Su Chen also laughed.

"Li Tai, there are 362 villagers in the manor. Give them 27 copper coins each. How many copper coins do you need in total?"

Hearing Su Chen's question, Li Tai subconsciously stood up to answer.

Su Chen raised his hand to signal him to sit down.

Li Tai frowned and thought, and couldn't calculate the answer for a while.

After about three minutes, Li Tai didn't give an answer, and no one else could give one.

They hadn't learned multiplication and division, so they could only use counting rods to deduce.

If it was an estimate, it would be fine, but if you wanted an exact answer like taking an exam, it wouldn't work.

"Li Tai, you don't need to calculate yet. We will learn this multiplication and division in the afternoon.

I will give you a question now. The answer is not important. The time is 25 minutes."

After Su Chen finished speaking, he looked at the reactions of the crowd. They were all good children, and their eyes were full of curiosity.

"There is a landlord who has 17 cows and wants to divide them among his three sons.

The eldest son can get half.

The second son can get one-third.

The third son can get one-ninth.

The cows cannot be killed, and the cows cannot be left undivided. How to divide them?"

After Su Chen finished speaking, everyone fell into thinking.

...

About 25 minutes later, Su Chen asked: "Does anyone have any ideas for this problem?"

Li Tai thought of a way a long time ago, but he didn't know if it would be considered a successful solution.

"Su Chen, I have an idea. I wonder if it can be considered a successful solution?"

Su Chen smiled and said, "Tell me."

Li Tai glanced at the big cow and coughed.

"Take the big bull as a bull and put it together with the 17 bulls, and you will have 18 bulls.

The eldest brother gets half, which is 9. The second brother gets one-third, which is 6, and the third brother gets one-ninth, which is 2.

The big bull remains intact, and the three brothers just divide up the 17 bulls."

Su Chen laughed and said:

"King Wei, you are really a smart man. No wonder you often boast that you are the smartest man."

He even forgot where he saw this question.

Su Chen thought about it and gave all the chemistry and physics books to Li Tai to study.

He knows a little, so he can only guide Li Tai in the early stage.

Li Tai felt a little embarrassed when he heard it. He did say such words in the palace.

It was mainly to attack Li Chengqian.

"Okay, let's do this for the morning. Li Tai, come with me and help me write something."

Su Chen wanted to write a report.