Li Yan has no objection to the third brother's teaching of mathematics, even if her arithmetic is better than their family's account room, but since the third brother said that he wants to teach, with the third brother's ability, he must have made a breakthrough in mathematics.

"Yes." So Li Yan agreed very simply.

"In this case, call Li Xin over too." Li Ke thought about it, anyway, a sheep is also herded, and a group of sheep is also driven, so it is better to bring them together.

"Okay." Li Yan agreed.

"In this way, Pei Xingjian." Li Ke said loudly.

"The minister is here." Pei Xingjian, who was guarding outside the account, quickly walked in.

"Go to Deputy Li's house, and then ask Li Xin's little lady to come over, talk to General Li, and say that I want to teach the two of them something." Li Ke said.

"Yes!" Pei Xingjian saluted and then turned to leave.

Li Daozong, who got the news, naturally would not stop him, and Li Xin naturally followed Pei Xingjian back with a curious face.

After Pei Xingjian left, Li Daozong found Mrs. Li: "Madam, what do you say this ......?"

"What are you worried about?" Mrs. Li glanced at Li Daozong.

"I'm just afraid that His Royal Highness will take a fancy to them......" Li Daozong hesitated, but still said it directly, he naturally knew the appearance of his two daughters.

"They just happened to be in the fifth suit, but they didn't come out in the fifth suit, what do you want." Mrs. Li glanced at Li Daozong, if there are five suits, then it is possible, but it is impossible not to have five suits, which is inconsistent with "Zhou Li", and Datang is almost the same as "Zhou Li" in this regard.

"Yan'er is not. Something was wrong with her yesterday. Li Daozong muttered, as an old father, although the ancients did not have the saying of a small padded jacket, most of them were patriarchal, in fact, in the wealthy family, because there is no shortage of money and other aspects, there are many people who like their daughters.

Although they still uphold the ancient concept of marriage, this does not conflict with liking their daughters. Every old father who marries a daughter always has mixed thoughts.

"Even if it's true, isn't that a good thing? If there is really that day, you will borrow a name and find the Li family of Zhaojun to accept Yan'er as a righteous daughter, and everything will be solved. "Mrs. Li is thinking far enough.

"Hey, forget it, I'm going to patrol, Madame, wait for them to come back, you can listen more." Li Daozong said helplessly.

"I see." Mrs. Li nodded.

Li Xin followed Pei Xingjian to Li Ke, and found that her sister was also there, and when her sister came over, she knew, but she didn't know what His Highness called her to do.

"Xin'er has seen my brother." When Li Xin saw Li Ke, he hurriedly saluted him.

"Just call me third brother in the future." Li Ke waved his hand.

Li Xin hurriedly agreed, and then looked at his sister with an unmoving look. My sister inquired about His Highness's three meals a day, oh, or the entire Chihai neighborhood is three meals, because of those workers who work.

So my sister came here with lunch, and it was only a little more than an hour before and after, and the relationship changed? What did my sister say to my brother?

"The third brother called you, it was your sister who said that she wanted to learn from the third brother, and I even brought you with me for this thought, and I will teach you mathematics first, that is, mathematics." Li Ke opened his mouth and said, what Li Yan told her, Li Ke naturally couldn't say it.

"Okay." Li Xin will not refuse to learn things, even if she has already learned the "Zhou Ji Sutra", "Nine Chapters of Arithmetic", "Island Sutra", "Wucao Sutra", "Sun Tzu Sutra", "Five Classics of Arithmetic", "Ancient Sutra", "Fixation", "Mathematics Notes".

"Come on, come on, I'll give you textbooks first." Li Ke asked Yang Anning to take out the textbooks prepared for them, speaking of which, mathematics was the first to be taught by Li Ke, and he began to teach these a few years ago, almost all the shopkeepers and accountants of Yuelai Commercial Bank have mastered modern Arabic numerals, as for this world, call it Li Ke numbers.

Although it has been invented now, it has not actually formed a unified and complete standard, and around 700 AD, the Arabs conquered India, absorbed the local part of the number, and then optimized the spread of it, and finally became the modern Arabic numerals.

But this world is different, the numbers of this world have long been spread to Arabia and other regions through Yuelai Commercial Bank, and even many commercial houses in Datang that trade with Yuelai Commercial Bank know these numbers.

In fact, it doesn't matter who invented it first, anyway, Li Ke has already sorted out part of modern mathematics, and he sorted it out by himself at the beginning, and when he found the underground library some time ago, Li Ke found a complete set of mathematics teaching textbooks.

This is much simpler, after rearranging and printing these math textbooks, Li Ke took them out, and this will be the shopkeeper of Yuelai Commercial Bank, a compulsory course for accountants.

"Elementary school textbooks? What do you mean? Li Xin asked a little blankly as he took the math textbook in his hand.

"It's a textbook." Li Ke said with a smile.

"Huh?" Li Xinren was speechless, I have basically finished learning the book of arithmetic, you let me learn Mengxue?

"Some of these problems may not be easy for you to solve." Li Ke said with a grin.

"I don't believe it." Li Xin obviously didn't believe it.

"Then you do this." Li Ke flipped the textbook to the back and found a fifth-grade example. This set of math textbooks is the latest, to be honest, after working for many years, Li Ke turned to these latest math problems that are more difficult in the fifth grade of primary school, and he sometimes does something a little doubtful about life.

Although he has worked for many years, a lot of math has indeed been returned to the teacher, but this is a fifth-grade topic? Are you afraid you're kidding me? It's not that Li Ke underestimates ancient mathematics, it's just that he thinks that Li Xin can solve this problem, but it may not be so easy to solve.

Not only that, in this set of mathematics textbooks, Li Ke found a complete set of modern abacus textbooks from the library and added them.

In ancient times, there were no calculators, but the abacus was not bad at all, after all, a lot of the data of our first atomic bomb was typed by abacus! It's that awesome.

After Li Xin finished reading the question, the whole person was stupid, this is the Mengxue topic? A pair of twins eat toffee and fruit candy, what one eats alone for as many days as it takes, and how many days it eats together. What is this?

Li Xin carefully read the question several times, and she had several algorithms in her mind, but they were not very accurate, and she always felt difficult.

"Third brother, are you sure this is Mengxue?" Li Xin is not good.

"Of course, this is Mengxue, in the school I am going to open soon, these are all basic teachings, oh, by the way, there is also this alphabet and pinyin, which I have improved, so you should all follow along." Li Ke also took out the primary school textbooks of Chinese, these are the textbooks he has made, and they will be taught in that royal academy in the future.

At present, it is just right, starting with the two of them, but they are also learning pinyin and alphabet, many characters in modern mathematics have special meanings, Li Ke feels that he does not have the ability to change it into a complete ancient version, so let's do it!

As for the letters, what's wrong with this thing? Isn't it your own to take someone else's?