Qin Zhen was very happy to see that Jia Tanchun was interested in this, he originally wanted to tell Jia Tanchun about this counting method.

At this time, seeing that her interest was aroused, he said again: "Actually, this is not only as simple as good counting, but also can be used to calculate these numbers." ”

For example, ordinary addition and subtraction algorithms can be calculated simply with such numeric symbols. For example, 10-2=8, an arithmetic problem, is expressed in this way. ”

"Using these numbers in our lives can bring us great convenience?"

10-2＝8。

Qin Zhen talked eloquently, without such an arithmetic formula as him, which brought Shi Xiangyun and them a great impact.

Just such a strange arrangement of numbers, does it mean that an algorithm has been completed? They were both strange and surprised!

Shi Xiangyun and Xue Baochai stared at Qin Zhen's number formula, and gathered around, carefully studied and checked.

To be honest, they had never seen this calculation before, so they felt that it was novel, and the curiosity in their hearts was no less than that of a person discovering a new world.

Of course, this was originally a whole new world for them.

Well, if he knew that an arithmetic formula could arouse their great interest, he wouldn't have said so much nonsense and done so much foreshadowing, and just listed this formula.

Looking at Shi Xiangyun and Xue Baochai and the others surrounding him, looking at the arithmetic formula he wrote, Qin Zhen thought so in his heart.

However, since he has attracted the interest of these people, then he should be a math teacher in the first grade of primary school!

Passing on these mathematical Arabic numerals to the people here, and whether anyone will apply this in practice afterwards, that's another matter.

He is now only responsible for spreading the fire.

Therefore, at the moment, Qin Zhen slowly discussed the issue of Arabic numerals with Shi Xiangyun, Jia Tanchun, and Xue Baochai.

How to count, how to calculate, how to solve the problems encountered in practice.

All of this was told to them one by one.

Of course, it is impossible to teach all of this knowledge at once.

However, as long as the magic of Arabic numerals is known to these women in the Grand View Garden, they will learn these knowledge slowly.

This knowledge is novel enough, and they themselves will come to learn from him.

Qin Zhen thought about the prospect of this question very well, but he didn't expect that when he was in the middle of the lecture, Shi Xiangyun suddenly asked:

"Qin Zhen. No, we don't know these things, how do you know? How did you know that these strange symbols represent different numbers? ”

Well, this does seem to be a problem, but Qin Zhen hates this question, and he also hates classmate Shi Xiangyun, who likes to ask questions so much.

"Miss Shi ......"

Qin Zhen was very annoyed, he wanted to reprimand Shi Xiangyun harshly, why do you ask so many questions, where did you come from so many questions? Are you a hundred thousand why?

These really made Qin Zhen angry.

But he couldn't do that, he had to answer the question raised by Shi Xiangyun.

Because after Shi Xiangyun raised this question, Xue Baochai and the others were also looking at him, waiting for his answer.

Then, he can't play prestige with Shi Xiangyun.

After Qin Zhen said that sternly, his tone softened again.

"Miss Shi, there are a lot of strange knowledge in this world, and they exist in all kinds of books, not only in all kinds of poetry and songs."

"So you only hold those subsets of scriptures and histories all your life, you won't know that in the corners of some book pavilions, there are such some knowledge."

"Therefore, just because you don't know, don't doubt someone else's knowledge that you don't know and have no source."

"It is not necessary to inquire about the source of learning, we just need to learn and master this knowledge."

"Anything else, is it really that important?"

Qin Zhen really wanted to roll his eyes at Shi Xiangyun.

Qin Zhen's words made Shi Xiangyun speechless, and she muttered in a low voice: "People don't suspect you much, can't you just ask?" ”

Qin Zhen also heard this, but he didn't say anything to Shi Xiangyun on this topic. There is no need to talk about superfluous nonsense, it is more important to preach and receive karma to solve doubts.

In the Rongguo Mansion, this knowledge was simply legendary, and seeing that the sky was about to get dark, Qin Zhen said:

"These things can't be taught clearly in a day or two, so let's come back tomorrow! That's all for today. ”

Of course, you can't make anything in a day, and you have to eat it bite by bite! Of course, everyone understands this truth.

So, an arithmetic teaching, even if it stops here, everyone goes back, of course those who have a heart will digest it well, and those who have no heart may forget it tomorrow.

Many people think that learning new knowledge is a happy and happy process. Actually, hehe......

A lot of people don't really like to learn. How can anyone love to learn? Many people have memories of being naughty and mischievous when they were in school!

In fact, learning is sometimes a painful process. There is no one-size-fits-all approach.

On the way back, Diao Chan said to Qin Zhen: "Grandpa Guo, I really didn't expect that you seem to understand so much." ”

Qin Zhen said unhappily: "What really didn't you expect, did you look down on me because I was young?" I'll punish you for coming to me tonight and letting you know how strong I am. ”

After saying a few words, Diao Chan only dared to bow his head and hurriedly leave, not daring to respond to him.

When Diao Chan washed at night, it was fragrant, Qin Zhen called Diao Chan to come, and was about to let her realize how strong he was, but Xiao Zhao suddenly reported to them outside: "Grandpa Guo, the third girl is here."

Jia Tanchun, Qin Zhen was a little surprised in his heart, but think about it, maybe Jia Tanchun came because of that incident during the day! She's such a caring person!

Qin Zhen went out and said to Xiao Zhao: "Go and let the third girl go to the study!"

In fact, it is not too late at this time, but the ancients had no entertainment at night, and at this time, the capital is withering, and there is no place to go at night.

Therefore, Qin Zhen is at this time, he has to have fun with Diao Chan and find some activities to make up for the gap in his soul.

But now that Jia Tanchun is here, then he can't do what he wants.

Qin Zhen got dressed and came outside, and sure enough, Jia Tanchun took her two girls, Shishu and Cuimo, who were already in the study.

Seeing Qin Zhen, Jia Tanchun blushed a little.

"Zhen Guogong, I was thinking about what you said during the day, and I thought that I should come to ask for advice, so I came here at this time, you won't think I'm presumptuous!"

She said.