"Cambodia, Cambodia?"

"Huh?"

Hearing the voice of his friend Wang Can, Zhang Cambodia raised his head a little dazedly, his thoughts had not yet been withdrawn from the piece of paper on the table, and he asked in a daze, "What's wrong?" What do you want me to do? ”

“……”

Seeing his friend's stupid appearance, Wang Can rolled his eyelids and said helplessly: "You don't want to see what time it is, don't you go to dinner yet?" ”

"Huh?"

After listening to his friend's words, Zhang Cambodia hurriedly looked out and immediately exclaimed; "Oops, I forgot to eat while I was reading...... Wang Can, is there still one? ”

"If you run faster, there should still be one!"

"Then I'm going to dinner...... Don't move the paper on the table! ”

Before Wang Can came back to his senses, Zhang Cambodia had already jumped up and ran outside the house.

“……”

After rolling his eyes again, Wang Can couldn't hold back his curiosity, walked to the place where Zhang Cambodia was sitting just now and took a look, and his brows suddenly wrinkled: "Why is this strange thing again?" It seems that Cambodia has been studying for a long time before, and I have to study hard for a long time after each schoolwork...... I finally finished reading a few books, why did I get a new one? ”

For this hobby of his friends, to be honest, Wang Can is very incomprehensible and disapproves.

Of course, they also have to start from elementary school in the subject of arithmetic.

After all, it is one of the six arts of a gentleman, and you have to understand a little bit more or less, and if you don't know it at all, won't you be fooled by others when you become an official in the future? But after entering Taixue, everyone rarely puts their minds on this...... At least in Wang Can's view, there is a great hope that an excellent person like Zhang Khan will enter Guozi School after graduation in the future, and there is no need to spend too much energy on this.

Otherwise, what would Guozijian do if he opened an arithmetic school and recruited those students?

You must know that although arithmetic is for the children of officials below the eighth grade, how many of them actually go to study? Most of them are the children of the common people, and in the future, they will also enrich their subordinates to become a small official......

Officials and officials, who wants to be officials?

Therefore, in Wang Can's view, as long as you understand a little and know how to check, you can naturally hand over specific things to your subordinates in the future. Zhang Cambodia has invested a lot of energy and time, and even affected his serious studies because of this...... Even if that guy is still good, it's still worth the loss when you look at it on the Internet.

After sitting in Zhang Cambodia's position and watching for a while, Wang Can finally shook his head, got up and walked away. Not to mention how boring those bizarre so-called Tianzhu numbers are, it is the boxy words on the white paper that make people lose interest after looking at it.

"So, is this thing really that interesting?"

After repeating the same sentence in his heart again, Wang Can picked up one of his books and read it a little carelessly while it was still dark.

In fact, it doesn't cost money to study in the national prison.

In fact, not only does it not cost money, but the imperial court also provides students with accommodation, food, and even clothing, and all other expenses, which basically means all public expenses. After all, most of the students in it are the children and grandchildren of officials in the DPRK and China, and they are also the hope of the future Datang...... In recent years, there are still too few talents obtained from the imperial examination, and there is no climate.

But even if it doesn't cost money to study, and no one is poor at home, but candles are ......

It's too expensive!

If you can see more before dark, you can save a little at night.

It's just that he had just been reading for a short time when he heard a thumping sound of running outside, and then saw Zhang Cambodia rushing in panting.

"What? So fast?! “

was taken aback at first, and then Wang Can saw Zhang Cambodia rushing directly to the desk, and after picking up the stack of white paper on the table, he immediately understood: "I said Cambodia, you are like this...... Not so good for the body? “

The way of health preservation is understood by all the children of older families.

"It's okay, just do it occasionally."

Without raising his head, Zhang Cambodia said casually: "While the sky is not completely dark, I will quickly look at it for a while...... This time, it's much harder than the last time! ”

“……”

Seeing that his friend was afraid of wasting a little time, Wang Can frowned, and couldn't help but speak: "Cambodia, don't you think you spend too much time on this arithmetic?" Especially...... Ahem, this Tianzhu number may be more convenient, but have you seen anyone use it? What will be the use of this thing in the future if you spend so long learning it? ”

"Huh? What's the use? ”

After listening to Wang Can's words, Zhang Cambodia and the others finally raised their heads and looked in the direction of their friends with a frown.

"yes, what's the use?"

"Uh......"

Facing Wang Can's searching gaze, Zhang Cambodia was silent for a moment before he spoke: "Wang Can, do you know King Han?" ”

"King Han? Yongzhou pastoral? ”

Stunned for a moment, Wang Can asked in amazement.

Although Li Yuanjia's name is indeed not obvious, and his daily life is too low-key, after all, he is a prince of the Tang Dynasty, and he is also a prince who stayed in Chang'an after "adulthood"! So even if he is in the "ivory tower" of Taixue, Wang Can still knows the existence of that one.

It's just that he really can't understand, why did his friend suddenly talk about King Han?

"Yes, it's Yongzhou Mu, King Han."

Raising his eyebrows slightly, Zhang Cambodia said indifferently: "The Tianzhu numbers and these arithmetic that you think are useless have now been used in the Han Wangfu...... All the stewards will use these Tianzhu numbers, and they will also use them to make simple calculations! In other words, all the accounts of the Han Wangfu are recorded with Tianzhu numbers! It's not even limited to bookkeeping...... Wang Can, do you know about the rollover? “

"Overturned? Of course you do! “

After being stunned again, Wang Can was stunned and said, "Don't tell me, you also need to use this Tianzhu number to make a rollover, right?" “

"Hehe, I really need to use it!"

Taking a deep breath, Zhang Cambodia nodded vigorously.

At this moment, he couldn't help but recall what Li Yuanjia, the king of Han, told him: "If there are no Tianzhu numbers and mathematics, a hundred carpenters can make dozens of overturned cars at most in a month, and they can make a hundred if they work hard!" But with Tianzhu numbers, with mathematics, they can make at least three hundred ......"

"What? That's impossible! “

Before Zhang Cambodia finished speaking, Wang Can had already exclaimed.

"Hehe, what's impossible?"

Blinking his eyes, Zhang Cambodia said seriously: "Do you know that there is now a dumping workshop outside Chang'an City, which can make more than 300 dumps every month!" And what they rely on is this Tianzhu number and mathematical ......"