The human brain develops like an adult at about four years of age, but the difference is that it takes a long time to fill it with knowledge and memory.

The people who come to apply for apprenticeships are at least 14 years old, and even if they have not really studied arithmetic, because they need to use some very basic content in life, simple addition and subtraction can still be used, at least they know that they will not make mistakes when trading with others.

Li Shangyu reviewed what Wei Gong said just now, and his heart was extremely shocked, he never thought that learning simple calculations would be so interesting-

"1919 Good Friends; 2828 hand in hand; Three-seven-three-seven is really intimate; Four-six-four-six walk together; Five or five into one pair of hands. ”

This is Professor Emiya's 10 addition mantras, which can be easily remembered in the form of a smooth mouth.

By now, Li Shangyu has forgotten how he learned to calculate simple addition and subtraction, maybe he sold sea cucumbers with his father and sold a lot, so he will slowly do it.

With the addition formula table within ten, Li Shangyu suddenly brightened up, and felt that the arithmetic, which was particularly high for them shrimp people before, was actually not far from their lives.

……

It took about ten minutes for Emiya to teach the most basic addition and subtraction within two digits, and to test the acceptance of the people present, so he came up with a simple math problem of 12+45.

Half of them do it right, and half do it wrong.

But he was not in a hurry to weed out these wrong people, but patiently tested a few more math problems within two digits.

In this regard, Wei Gong specially asked Xin Lang to record everyone's question test situation one by one.

By the time of the third question, more than 85 people had already got it right.

Emiya said he was satisfied.

People who have done the right questions before do not mean that they are smarter or have stronger learning ability than other people, it may be that they are experienced, and from doing it wrong to doing it right, there is a relatively large room for improvement.

As for those who have been doing wrong, Wei Gong has drawn a big cross in his heart, if it is a child of three or four years old, he can still accept it, but these people are adults in a sense, and rich life experience can at least teach them these simple things.

If a person who can't even do two-digit addition and subtraction can't do it well, it is estimated that it will be difficult to understand the course that Cui Xiaoxiao wants to teach in the future, his first batch of disciples, he hopes to become the strong backbone of the Wei Sword Forging Empire in the future.

"Since everyone is almost familiar with the addition and subtraction of two-digit numbers, let's start the addition and subtraction of three-digit numbers, three-digit numbers are relatively simple, if you can master the two-digit operation, then the rest is-"

Preparing to make it more difficult, Emiya wrote down two numbers on the blackboard: 112 and 213.

"You see, what we need to do is take these numbers apart."

The two-digit addition vertical style has been taught once before by Emiya, but now it has an extra single digit in front.

At this moment, before he could finish speaking, someone below suddenly whispered, "The result is 325." ”

Emiya turned his head with a smile, this was the first time someone had answered in advance in his class, and the answer was actually correct.

This was a big surprise to him.

"Which one just said 325?" Emiya searched the field with his eyes.

A dark-skinned teenager stood up silently, "Yes, I'm sorry, I was quick to talk for a while, and I accidentally ......"

The boy was dressed in a patched short coat, barefoot, and his lower body trouser legs rolled up, apparently dressed as a seaside fisherman, and in the Dream Sword Country, this kind of person at the bottom is usually called a shrimp man.

Compared to the other well-dressed recruits, the teenager looked a little out of place.

The eyes of the people around him will have a hint of disdain in their eyes.

Some people have begun to chuckle with disdain, a shrimp people who don't understand anything, what nonsense just now, Master Weigong hasn't taught the things in the back yet, can he be self-taught?

There are also some people with playful expressions on their faces, thinking that this young man is really too ignorant, talking nonsense, I am afraid that he will offend Master Weigong, but this is fine, there is one less competitor, and his dress is really too eye-catching, and there is a stinky fishy smell on his body.

Wei Gong had not experienced much of this back then, so he was quite sympathetic to this young man's situation, he didn't care at all about the eyes of the people around him, and looked at this young man with a smile, "Is this your own calculation?" ”

"Well, yes."

Li Shangyu thought in his heart, and whoever looked at him with contempt, he glared back viciously.

Seeing the way his eyes bulged, Emiya felt a little funny.

"Then you come up and write down the calculations."

After he finished speaking, he raised his hand, and the chalk on his fingertips stopped in the air, waiting for Li Shangyu to pick it up.

Li Shangyu was stunned for a moment, his face turned red after brushing it, and in front of so many people, he suddenly felt a little panicked.

However, with the encouragement of Emiya's eyes, he still had the courage to go to the front and take the chalk.

Li Shangyu walked to the blackboard and drew a horizontal line under the two numbers written by Wei Gong.

"Just now, Master Weigong, you have already said that the calculation of two-digit numbers needs to be separated into a separate number, so I was wondering if the three-digit number is the same, so according to my own ideas, I split 112 into 1, 1, 2, 213 into 2, 1, 3, and then add up the corresponding series of numbers. In this way, the single digit is 2 plus 3 equals 5, the ten digits are 1 plus 1 equals 2, and the hundred digit is 1 plus 2 equals 3, and then spliced together, the result of 325 is obtained. ”

He finished the calculations, then turned around and looked at the emiya with some trepidation.

It is estimated that only about half of the people here have understood, and the other half are still immersed in what he just said.

I don't know why, but it sounds so reasonable.

"Papapa......" Emiya applauded alone.

"That's good." He let out a sigh, this is really a smart young man, who knows how to draw inferences, and it seems that he has the hope of becoming his most effective assistant in the future.

Everyone looked at each other, unbelievable that this shrimp man had actually been praised by Master Weigong just now.

How is this possible?

Even Li Shangyu looked flattered.

"Do you all understand, this classmate just now, no, what this teenager said is the correct basic calculation method of three-digit addition and subtraction, as long as you can master vertical calculation, even if it is a thousand, ten thousand or even hundreds of millions of calculations, it will not be a problem."

Li Shangyu looked at him blankly, and suddenly felt a wave of emotion in his heart, since he was a child, he had never received such praise, this swordsmith called Weigong had a taller image in his mind.

Not only is he knowledgeable and swordsman-skilled, but he is also able to treat everyone equally, and he does not dislike him because of his status as a shrimp people.

This is a person who has both ability and moral integrity and can make him follow for the rest of his life.

……