Datang: Li Er, are you teaching me how to do things?

Chapter 67 Addition
After about an hour, the door of the director's office of the workshop opened.

Fang Yiyu's face turned red, her face was full of dislike for Li Yun, but her eyes were full of smiles and joy.

Li Yun nodded the table, "Ayu, be serious, even if you covet my beauty, don't think about it all day long."

Fang Yiyu glared at Li Yun.

"You still dare to stare at me, believe it or not, I will do it again."

"come on."

Li Yun got up and rushed over, and after a while, the two separated, Li Yun was full of ambition, Fang Yiyu snorted, and muttered in a low voice: "Sooner or later, I will take revenge."

"What did you say?"

"It's nothing, you...you just teach me how to count quickly, you didn't swing a stick just now, how did you do it."

"mental arithmetic."

"Mental arithmetic, swinging a stick in your heart?"

Li Yun shook his head, then took a pen and paper, wrote down the Arabic numerals from 0 to 10, and then said: "I learned this from a businessman in the Western Regions, and this is the Arabic numerals."

Numerals seem to have been invented by mathematicians in ancient India, and later spread to Arabia and spread by Arabs. This is called Arabic numerals.

But no matter who invented it, Li Yun doesn't care, as long as it's easy to use.

He himself does not need the title of mathematical inventor.

"This number... is so strange."

Li Yun nodded, then wrote while talking: "This is a plus sign."

"One plus one equals two, one plus two equals three...one plus nine equals ten."

"Try to swing the stick and see if I'm right?"

"Is it right? As long as you memorize the formula, you don't need to do mental calculations with sticks."

Fang Yiyu then posed with a stick according to what Li Yun said, and found that it was 100% correct as what Li Yun said.

"Come on, you follow me to read, and then memorize it by heart, I will teach you the addition of more than ten digits, and then the addition of hundreds of thousands of digits."

Fang Yiyu nodded, and then began to learn seriously. She already had experience in swinging sticks, so it can be said that learning addition and subtraction of ones is as easy as pie.

Then there is the addition of tens, hundreds, and thousands, which are more difficult, but under Li Yun's repeated teaching, Fang Yiyu also made rapid progress. By the time he got off work in the afternoon, Fang Yiyu had already mastered addition.

Li Yun smiled and said: "Your brain is not bad, tomorrow I will teach you subtraction, and then multiplication and division."

Fang Yiyu didn't know what multiplication and division were, but she felt that Li Yun was amazing, and she looked at Li Yun softly and full of admiration.

Li Yun's heart fluttered, "Yu'er, come here quickly, I will give you a good gift."

After a long time, the two separated, Fang Yiyu rolled his eyes at Li Yun, "It's so ugly, where did you get the gift from?"

"You don't want to go home, do you? Dare you say I'm ugly?"

Fang Yiyu hurriedly begged for mercy, and then Li Yun sent Fang Yiyu home.

When she got off the carriage, Fang Yiyu's face was still flushed, just now in the carriage, she was taken advantage of by Li Yun again.

If it wasn't for the inconvenient carriage, she would have been almost eaten by Li Yun.

After getting off the carriage, Fang Yiyu reminded herself to encourage "women's rights", but at the same time she was very happy. She also liked the feeling of being kissed.

Humming a ditty and came to the hall, just in time to see Fang Xuanling and Lu Shi.

Fang Xuanling was reading a book, and Lu Shi was looking at the account book. Like Fang Yiyu, she was also swinging a stick.

When the two saw Fang Yiyu, they didn't say anything, they just lowered their heads and went on with their own business.

Fang Yiyu was unhappy, she was so happy today, wouldn't her parents congratulate her?

"Father, what book are you reading?"

"Zuo Zhuan."

Come on, this book is boring.

"Auntie, what is it?"

"Last month's expenses in the house are really annoying. Your father is stupid, and I have to calculate it every time."

Of course Fang Xuanling is not stupid, it's just that he is an important minister of a country, so it's better to let him have a good rest if he spends time on such trivial matters.

Fang Yiyu's eyes lit up, "Aniang, let me help you."

"You come to help me, no need, your arithmetic is far worse than mine."

Fang Yiyu was not convinced, and then took a pen and paper, "Aniang, just try it, you say the number, and I will calculate it."

Lu couldn't hold back Fang Yiyu, and then came up with a number, which Fang Yiyu calculated easily.

Lu Shi still didn't believe it, so he used his stick to calculate, after a while, he found out that Fang Yiyu's result was correct.

She then tried several times, and Fang Yiyu's results were all correct.

"Hahahaha," Fang Yiyu laughed triumphantly, "Aniang, how are you doing?"

"Excellent, where did you learn this?"

"Brother Yun taught me," just as the words finished, Fang Xuanling and Lu Shi both looked over.

Fang Xuanling felt a sense of relief, while Lu Shi was somewhat reluctant and joking.

"They're all called Brother Shangyun, and the whole gang hangs out together, not serious."

Fang Yiyu blushed, and then retorted: "Aniang, I'm not just playing, I learned a lot? You see, this is the method of arithmetic."

Hearing this, Fang Xuanling also moved over.

He was quick-witted and quickly understood the power of this arithmetic. "This... this method is really miraculous. If it is popularized, it will be a great achievement passed down through the ages, and it will be much more convenient for the common people to live."

"Daddy is right. Using this arithmetic method, I can easily figure out the problems in the ledger."

Fang Yiyu paused for a moment, and then said: "Brother Yun also promised me that he would teach me subtraction, multiplication, and division in the future. He said that if he learned it, it would be easier."

"Oh, did His Highness invent this?"

"No, he said he learned it from merchants from the Western Regions."

Fang Xuanling frowned slightly, "Why haven't I heard of merchants from the Western Regions knowing this?"

"I don't know, anyway, Brother Yun said so."

Fang Xuanling thought for a while and said: "This should be invented by His Royal Highness the Crown Prince, but he has been in the limelight recently, and Mu Xiuyu will be destroyed by Lin Feng. It seems that he wants to keep a low profile."

Fang Yiyu couldn't help feeling distressed, "Really, that's such a pity, it's a great thing to be famous through the ages."

"Are you distressed?"

"Where is it?"

Fang Yiyu blushed, then turned to Lu Shi, and wanted to help Lu Shi clean up the accounts.

Fang Xuanling said leisurely: "I have a way to allow this achievement to be credited to His Highness without making people jealous."

"Oh, how?"

Fang Yiyu immediately came over, grabbed Fang Xuanling's hand, and said coquettishly, "Father, tell me quickly?"

Fang Xuanling chuckled, "Since you can't use the name of the prince, then you can just use Layman Qinglian. Anyway, most people don't know who Layman Qinglian is, but we, as well as Your Majesty, know it. will be taken over."

"That's a good idea."

Fang Yiyu was overjoyed, she wished she could go to the East Palace now and tell Li Yun about this method.

"Smelly girl, stop smirking, quickly help me do the accounting, and then teach me."

Lu looked at Fang Xuanling appreciatively, and felt that Fang Xuanling's idea was reliable.

(End of this chapter)