Addition and subtraction are vertical, and adults can see it at a glance as long as they know a little bit of arithmetic.

But multiplication and division are a bit more subtle.

Lin Banxia was a college student in his previous life, he had never been a teacher, and he was also a student, so it was effortless to explain this.

I wrote a random multiplication vertical calculus next to it.

Shen Cheng didn't know where to find an abacus, the beads crackled a few times, Lin Banxia hadn't finished explaining the vertical style, and the answer had already been reported on the abacus.

"Lin Xiangjun, this vertical style is really exquisite." Shen Cheng praised before continuing, "But it's not as fast as abacus." ”

Lin Banxia had to admit that the things of the ancestors were indeed very good.

She praised: "Mr. Shen's abacus is exquisite. ”

Zhou Sheng said on the side: "Lin Xiangjun's vertical style also has its advantages. I seem to be easier to grasp, and it's easier to check right and wrong. ”

Shen Cheng also said: "Indeed, mental arithmetic should be taken into account when counting in the abacus, but this vertical form is not necessary." ”

I also stepped forward to pick up the chalk and listed a vertical style on the blackboard, and I was unfamiliar with the Arabic numerals and chalk, but after writing down a calculation slowly, it was much easier.

Comparing the two compartments - Lin Banxia thought that he had never practiced hard pen writing, and he had also written Arabic numerals for many years, which was extremely smooth.

But seeing the few numbers written by Shen Cheng, he could only describe himself with shame.

The words of the ancients are so good-looking? All the numbers are almost carved out of a mold, more like a printed one than a printed one.

Look at what I wrote again, it's obviously neat and neat, but it's not as good as not knowing.

Shen Cheng wrote the multiplication vertical form, and understood the subtlety of it, so he urged: "Lin Xiangjun, what about this division?" ”

The division is a little more complicated - it doesn't get much more complicated, that is, when writing a multi-digit number divided by a two-digit number without dividing it, the decimal point is brought so that there is an infinite loop of decimals.

The division equation extended in an infinite direction, and soon developed into fraction calculations, and Shen Cheng's problems emerged one after another, and soon developed to the circumference.

Xia Changyan and Zhou Sheng stood aside, and saw that Lin Banxia was not writing on the blackboard, in addition to numbers, there were some very strange symbols.

Occasionally, I wrote a few Chinese characters, but I lost a lot of strokes like missing arms and legs.

"That's ......," Shen Cheng muttered a few words as if he had suddenly realized.

Lin Banxia dropped the chalk, took a few steps back, admired the mathematical equations on the blackboard, and felt that the task of entering the city today was completed.

"Your Highness."

"Your Highness."

Lin Banxia spoke almost at the same time as Shen Cheng, and then stopped at the same time.

The two glanced at each other, and Lin Banxia made a gesture of "you please speak first".

Shen Cheng immediately said eagerly: "Your Highness, can you please Lin Xiangjun to stay in the palace for a few days, I still have many questions to ask Lin Xiangjun." ”

Xia Changyan smiled slightly, looked at Lin Banxia and said, "It's rare for Miss Lin to come to the county once, why don't you be a guest in the palace for a few days."

One can look at the soybean oil pressed products, and the other can solve Mr. Shen's confusion. ”

Lin Banxia opened her mouth and stammered, did she move a stone to shoot herself in the foot?

Zhou Sheng nodded on the side and said, "Mr. Shen is obsessed with arithmetic, so he can discuss it with Lin Xiangjun." ”

Xia Changyan smiled again: "There are many guest rooms in the palace, and Ling Zun Lingtang can also live together for a few days and have a good time in the county." ”

Xia Changyan's thoughts were clear at a glance, and Lin Banxia found that she was also a little tempted.

Xia Changyan is handsome, has good speech, and is gentle and golden.

She was a few years older than her body, but about the same mental age as her.

And the identity of the prince is also a plus.

However, Lin Banxia also understands that her motivation starts with her appearance, and it is also related to what Xia Changyan has done for her in the past few days.

It's just that no matter the appearance or the identity of the prince, it is not enough that she can tolerate the asymmetry of her identity, and she will share a man with other women in the future.

Lin Banxia looked at Xia Changyan for a long time, and suddenly smiled: "My father and mother have never lived in such a good place, bother Your Highness." ”

Zhou Sheng went out with the drawings drawn by Lin Banxia, Shen Cheng stood in front of the blackboard to continue studying, and Xia Changyan took Lin Banxia back to the study and handed her a copy of the "Three Character Classic".

"Enlightenment reading, simple and catchy. Every day, King Liben teaches you ten big characters, and you copy them several times, and gradually you will become literate. ”

said and laid out the rice paper: "This king just saw you use chalk, and the pen is powerful and very skilled."

You're just not used to using a brush. The brush needs to point to the real palm, and the five fingers work together, meaning the pen to follow. ”

Xia Changyan slowly put down his pen on the rice paper, wrote down the words "the beginning of man", and then moved out of the way and said to Lin Banxia: "You come and try." ”

Xia Changyan spoke casually and relaxedly, and his demeanor was natural, which doubled the pressure in Lin Banxia's heart.

She suddenly felt like a scumbag.

Don't refuse, don't take the initiative, don't take responsibility.

"Your Highness." Lin Banxia pondered and said, "Thanks to His Highness's appreciation and love, I am deeply grateful that what I have learned can have the opportunity to benefit the people of Li. ”

Xia Changyan's brows furrowed slightly.

Lin Banxia regretted his decision a little.

"In the next few days, I will discuss mathematics with Mr. Shen, and when the sugar factory starts, ......," he said with a bright smile, "Your Highness, if the oil factory starts, you will also score 30% of the profit." ”

stepped forward and picked up the "Three Character Classic": "Thank you, Your Highness." ”

Xia Changyan's smile slowly disappeared.

He put down the brush, his expression was solemn, and his tone was cold: "So, I'm annoying Miss Laolin." ”

Xia Changyan couldn't understand how he, a prince, could not cover her heart if he did this for Lin Banxia.

In the courtyard, Lin Banxia was talking to Shen Cheng about counting again.

The original handwriting on the blackboard was erased without hesitation, and the numbers were replaced with new calculations.

Xia Changyan had a dark face, crumpled the paper on the desktop with the words "the beginning of man" written on it, and threw it on the table.

Lin Banxia just loves money.

Sugar factory, oil factory, thirty percent of the profit, hehe.

He is a prince, is he not as good as the thirty percent profit of the sugar factory and the oil factory?

"I plan to renovate and widen the road from our village to the county seat after the beginning of spring, and use the waste materials produced by the sugar factory as the base." Lin Banxia's voice came from the courtyard.

"Lin Xiangjun's idea is too good, in this way, it is not a waste to treasure." Shen Cheng was pleasantly surprised.

Lin Banxia's voice continued: "There is also an oil factory, which is also open near our village, and the roads between our village and other villages will be repaired in the future." ”

Shen Cheng asked: "Lin Xiangjun, how much oil can be produced by soybean pressing?" ”

Xia Changyan couldn't help but walk to the window.

Lin Banxia hesitated for a moment and said, "At least one percent." ”

Shen Cheng thought about it: "The residents of the Northland live on soybean sorghum, and after removing taxes, the harvest year is enough to make ends meet, but in the case of a famine, it is not easy to make a living.

Squeezing soybean oil is to snatch food from the people's mouths, and exchange ten percent of the grain for one percent of the oil, so it still needs to be carefully considered. ”