After laughing, the eldest grandson Wuji said, "Aren't you still missing two people?" I can go with you to the Chongwen Temple. ”

"Thank you!" After Li Chunfeng thanked him, he turned his head to look at Wang Xiaotong and the others, and asked, "I don't know how many doctors are still willing to help?" ”

"This ......"

For a while, Wang Xiaotong and the five of them were a little hesitant, after all, Li Chunfeng had ridiculed Dong Wenshu just now, so he had a mustard in his heart.

But then again, the princess's own brother has gone in person, is there any room for them to say no?

After a moment of hesitation, I saw the five people say in unison: "We are willing to go." ”

"Then there will be more of you."

So, with the pressure of the eldest grandson Wuji, Dong Wenshu and the others no longer dared to complain, and honestly followed behind Li Chunfeng, and finally, Li Chunfeng found the last person, and then turned around and walked towards Chongwen Palace.

It is said that Li Chunfeng has been out of the Chongwen Hall for a while, and when he returned to the Chongwen Hall with everyone, Li Chengqian and Li Lizhi were sitting in the hall and napping.

"The little prince? Small county lord? When he came closer, Li Chunfeng called in a low voice.

"Huh? Who? Li Chengqian rubbed his eyes, and when he opened his eyes, the first thing he saw was the eldest grandson Wuji over there.

"Uncle! Uncle! ——”

A cheer came, and Li Chengqian got up and rushed to the eldest grandson Wuji over there.

Li Chunfeng was stunned for a moment, and said secretly in his heart: "Uncle? Could it be that this five-grade official is the elder brother of the eldest grandson clan - the eldest grandson Wuji? ”

After knowing that the person in front of him was the famous eldest grandson Wuji, Li Chunfeng began to re-examine him.

"Uncle hasn't come to see Qian'er for a long time." Throwing himself into the arms of the eldest grandson Wuji, Li Chengqian was coquettish.

The eldest grandson Wuji smiled: "Hahaha, isn't my uncle here?" ”

The court etiquette of the Tang Dynasty was not as much as that of the Ming and Qing dynasties, so Li Chengqian was able to interact with the eldest grandson Wuji so intimately.

Li Lizhi also walked over and said in a milky voice: "Uncle." ”

"Come over and let my uncle hug me." As soon as he stretched out his hand, the eldest grandson Wuji reported Li Lizhen and Li Chengqian together.

The eldest grandson Wuji, Li Chengqian, and Li Lizhi showed off their family over there, leaving Li Chunfeng and the others standing in place with a little embarrassment, they all felt redundant.

Finally, the eldest grandson Wuji remembered the matter, put Li Chengqian and Li Lizhen down, and said, "Qian'er, Qian'er, I heard that Dr. Li gave you a question?" ”

"Well," Li Li said in a milky voice, "Dr. Li asked my brother and me, ten people, how many hands and how many fingers there were. ”

"Did you figure it out?"

Li Li's little head shook like a rattle, and said, "No." ”

The eldest grandson Wuji turned his head, looked at Li Chunfeng, and said, "Dr. Li, you can start your lecture." ”

"Oh, good." Li Chunfeng came back to his senses, looked at Li Chengqian and said, "Little prince, do you remember the result I said?" ”

Li Chengqian said: "Dr. Li said that ten people have a total of 100 fingers. ”

"That's right." Li Chunfeng said, "Now, there are exactly ten people here, and the little prince can verify it himself." ”

Li Chengqian looked at the eldest grandson Wuji, and the eldest grandson Wuji smiled and said, "Qian'er, let's start." ”

"Hmm."

I saw Li Chengqian begin to shuttle between the crowd, accompanied by a crisp voice: "One, two, three......"

Li Chengqian counted one by one clearly, from one to one hundred, without the slightest pause or hesitation in between, which shows that Li Chengqian must have received a good enlightenment education before.

Finally, Li Chengqian counted the last three fingers on his hand: "Ninety-eight, ninety-nine, one hundred." ”

After counting, Li Chengqian's eyes lit up, and his eyes turned to Li Chunfeng and said, "It's really a hundred." ”

Li Chunfeng smiled slightly: "That's nature." ”

"How do you do the math?"

Li Chunfeng smiled: "Actually, it's very simple. ”

As he spoke, Li Chunfeng came to the two large tables in the Chongwen Palace, then took a brush from the table, and said while writing: "A person has two hands, and one hand has five fingers. ”

Li Chunfeng wrote "2X5" on the paper, paused, and Li Chunfeng sketched "=10" in the back.

"1 person is 10 fingers, and those 10 people are 10X10, and the result is equal to 100."

After Li Chunfeng wrote this, Wang Xiaotong, Dong Wenshu and others all frowned.

"Dr. Li, what do you mean by this symbol?"

Li Chunfeng took the pen, pointed to these numbers, and said, "These represent one and zero, which is an Arabic numeral." ”

"Arabic numerals?"

As soon as they heard this word, Wang Xiaotong and other five people with great knowledge were all surprised, obviously they had heard the word "Arabic numerals" for the first time.

The eldest grandson Wuji said: "Arabic numerals? Could it be that this Arabia is a country? ”

Li Chunfeng nodded: "Lang Zhong is right, Arabia is a country, because these number symbols they invented are very clear, simple, and easier to accept when performing arithmetic calculations." ”

"What about the other numbers, how do you express them in Arabic numerals?"

"This is 1, this is 2, this means 3......"

So, Li Chunfeng wrote down all the numbers from 0 to 9 on paper and explained in detail the combination between them.

After listening to Li Chunfeng's explanation, the eldest grandson Wuji praised: "Wonderful, I didn't expect that 0 would have such a function, and when I used this Arabic numeral to represent large numbers, it was really much easier." ”

Li Chunfeng said with a smile: "Not only that, but if you express it like this, you can use the vertical calculation method. ”

Saying that, Li Chunfeng demonstrated to the eldest grandson Wuji the two-digit multiplication calculation that even elementary school students can do in modern times.

Li Chunfeng calculated on the spot, and soon calculated the result, and Wang Xiaotong and others on the side looked incredible.

The eldest grandson Wuji smiled and said: "Hahaha, you kid, you really have two hits, so it seems that a few days ago, you used this calculation method in the Huancai Pavilion?" ”

Li Chunfeng said: "Well, sort of." ”

"Okay, it's really young and promising," the eldest grandson Wuji said, "It seems that it is very wise for the princess to teach you arithmetic from Qian'er and Qian'er." ”

"The eldest grandson Lang is in love." Li Chunfeng said, "I only know a little bit about arithmetic." ”

When Wang Xiaotong and the others on the side heard Li Chunfeng's words, their faces were very complicated, and they said secretly: "If you know a little? Wouldn't we be able to wait for one or two? ”

"Okay, okay, Dr. Li shouldn't be modest anymore," Eldest Sun Wuji said, "Here, there are no outsiders, your ability, today we can be regarded as opening our eyes." Turning his head, the eldest grandson Wuji looked at Li Chengqian, and Li Li said, "Qian'er, Qian'er, I will have to learn this calculus with Dr. Li in the future." ”

"Qian'er remembered."

"Remember."