Technology dominates the Three Kingdoms

Chapter 116 [Godlike Law: Ninety-Nine Multiplication Table! 】

After reading all the letters, Lu Bu showed a satisfied smile, looked at Lu Lingqi, and praised: "As expected of my daughter, Bingxue is smart, and you answered all the questions correctly. You are really the pride of my father!"

"Hee hee. Of course, Lingqi Bingxue is smart, otherwise how would she be worthy of being a father's daughter. It's just that my father didn't realize it before, and he buried his talent." Lu Lingqi spoke with a tone of half an adult and half a child. cute.

Lu Bu tapped Lu Lingqi's forehead lightly with his fingers, and said with a smile: "You are still burying talents, you child, let's talk about it when you grow up. If you praise you now, your tail will be raised. It's really not a compliment."

"Then, there are those who have no tail, no tail. If you don't have a tail, you won't be proud." Lu Lingqi refused to admit it.

Chen Gong on the side was really envious of the frolicking father and son in front of him, he couldn't help but think of his wife and children in the Central Plains, and the warm life with his family he once had.

If it was a peaceful and prosperous age, he should also be spending a leisurely life with his family. Chen Gong thought.

"Okay, I won't talk to you. Since you have learned it so quickly, father will teach you some difficult arithmetic to see if you are really smart." Lu Bu said semi-excitedly.

The innocent and pure Lu Lingqi took the bait immediately, and said confidently: "Okay, just teach me, my daughter will learn quickly."

As a curious audience, Chen Gong watched silently from the side.

"How much is one plus one?" Lu Bu opened his mouth to ask an idiotic question, and regretted it after asking.

Lu Lingqi giggled, "Father still treats his daughter like a three-year-old child. These mothers have already taught her that one plus one equals two. There are even more difficult things. My daughter can do it."

"The question just now doesn't count. Let's start again now and test you well." Lu Bu was cheeky, without showing any embarrassment, but just perfunctory.

Lu Bu: "How much is six plus nine?"

Lu Lingqi: "Fifteen."

Lu Bu: "What is seventeen plus five?"

Lu Lingqi: "22."

Lu Bu: "What is thirteen plus eighteen?"

Lu Lingqi: "31."

Lu Bu: "What is 23 plus 37?"

Lu Lingqi: "Sixty."

"Not bad, it will be even more difficult next time." Lu Bu didn't expect ten-year-old Lu Lingqi to be good at math.

Lu Lingqi's expression was very relaxed, "Okay, father just ask questions."

Lu Bu: "What is 65 plus 52?"

Lu Lingqi: "110 seven."

Lu Bu: "What is 86 plus 96?"

Lu Lingqi: "180 two."

Lu Bu: "What is 120 three plus 110 five?"

This time Lu Lingqi didn't give an answer immediately, she thought about it with her fingers, and said after a while: "Two hundred.38!"

It seems that the addition within one hundred is not difficult for Lu Lingqi, but the addition outside one hundred is not easy to calculate immediately.

Two hundred didn't intend to continue asking, lest it would be too difficult and hurt Lu Lingqi, so he said: "Very good, but don't be too proud, you need to learn more in the future, you know?"

"Oh..." Lu Lingqi no longer had the confidence she had before. If her father asked her something more difficult, she couldn't promise to answer.

However, in Chen Gong's opinion, as a girl, even a ten-year-old girl, Lu Lingqi is already quite remarkable, and praised: "Missy, she is talented and intelligent, and she will definitely be a talented woman in the future."

But Lu Lingqi was not happy when she heard it, and retorted: "I don't want to be a talented girl, I want to be a general!"

Chen Gong was immediately embarrassed.

"You can be a great general only if you have both civil and military skills, so you can be a great general and a talented woman at the same time." Lu Bu said flickeringly.

When Lu Lingqi heard this, she immediately cheered up: "It turns out that both a talented woman and a great general can be both. I thought I could only choose one. Now, let's choose both together!"

In this regard, Lu Bu could only nod silently.

As for Chen Gong, I don't know how to say it, how can a child be serious with her.

After that, Lu Bu directly wrote on the slips: [21+13=], [32+12=], [52-24=]. Wait, write the addition and subtraction formulas in Arabic numerals.

Lu Bu said: "This [+] means addition, [-] means subtraction, and [=] means equal. How about doing calculations like this, you two have a look."

"If these symbols are used instead to perform addition and subtraction, it is indeed much more convenient, simple, and clear at a glance. My lord is a genius, and I can come up with such a method. If these symbols are used for calculations, especially in terms of accounts, it will be quite useful."

Chen Gong realized what changes these symbols would bring.

"Father, I've written all the answers. Take a look and see if there are any mistakes." Lu Lingqi didn't care about the influence of those, and answered all the more than ten questions written by Lu Bu in two or three strokes.

Moreover, one of them is correct, which shows that Lu Lingqi's ability to accept and learn is at least outstanding in the aspect of number calculation.

Then Lu Bu talked about the calculation method using these Arabic numerals:
For example: 156+68=? , can be calculated by writing it on the letter in this way.

156
+66
-

222
This kind of calculation method is simple and convenient, and it is easy to use.

For more than an hour, Lu Bu was explaining to Chen Gong and Lu Lingqi how to use Arabic numerals to perform addition and subtraction.

However, without paper, it would be a waste of bamboo slips.Although it can be washed afterwards and used again after drying, it is also very troublesome.

Lu Bu thought for a while, and simply found two larger pieces of tissue paper, wrote the [Nine-Nine Multiplication Table] on both sides, and let Lu Lingqi and Chen Gong each take a copy.

In fact, there are some simple, but esoteric multiplication and division operations in the existing [Nine Chapters of Arithmetic].Chen Gong also understands some, but only understands some superficial ones.

"This is called [Nine-Nine Multiplication Table], and you can perform basic multiplication operations with just a few clicks. This [X] stands for multiplication, 1X2 means adding two ones; 1X3 means adding three ones; 2X2 , means the addition of two twos; 2X3 means the addition of three twos. By analogy, the rationality of the entire multiplication table can be verified."

"You can recite [Nine-Nine Multiplication Table] like this." Then, Lu Bu pointed to the Nine-Nine Multiplication Table on the silk paper, and said: "One one gets one, one two gets two, one three gets three, two two gets four , Two three get six. Six six 36. Nine nine 81."

"After memorizing the multiplication table backwards, it is convenient to do multiplication arithmetic. For example, when you see 6X8, you will immediately respond to 48, and you will get the answer immediately."

Lu Lingqi was a little dizzy when she heard it, she was a little confused when she accepted so many new things at once, but she felt that it was very fresh, interesting and magical.

Chen Gong couldn't fully understand it for a long time, but knowing that this was a rare opportunity, he stood up and bowed to Lu Bu, begging: "My lord, I have a merciless request."

"Tell me." Lu Bu looked at Chen Gong.

"I want to promote this symbolic writing and its calculation method in the General's Mansion. I believe it will be of great help to the Lord in the future." Chen Gong was eager to try.

He thought it was something, but Lu Bu didn't care, anyone can learn it, so he gave Chen Gong a piece of silk paper with [Nine-Nine Multiplication Table], and said: "You take this too, those who want to learn this kind of arithmetic The more the better, of course, if it can bring some benefits to this general, it would be good."

"Thank you, my lord, for fulfillment."

Chen Gong was so excited, he was going to take the second shot for an unprecedented event, creating a precedent, maybe it would be famous forever.

After that, Lu Bu continued to answer questions for the two of them, explaining some simple calculation methods, as well as the simple rules of multiplication, division, and subtraction.

(End of this chapter)