Tang Dynasty Mingyue Song Dynasty Pass

Chapter 104 Strange Numbers

Bai Susu was surprised when he heard the words, and asked, "What are numbers and what are they used for?"

Su Chen felt that verbal explanations were difficult to understand, so he took out the smallest hard brush pen from the pen holder on the table, dipped it in ink, and wrote ten numbers "0, 1 to 9" on a piece of rice paper. Arabic numerals, explained to her: "This is a mathematical symbol, representing zero, one, two to nine, eleven is represented by 11, and so on..."

"The method of substitution?" Bai Susu was very clever, guessing how much it meant.

Su Chen nodded and said: "That's probably what it means. We use these numbers to express different numbers through a certain combination relationship. The combination of two numbers is the tens digit, and the combination of three numbers is the hundreds digit. For example, when I write This 124 means 120 four, do you understand?"

Bai Susu pondered for a while, nodded slightly and said, "I understand."

"Well, you can write it down a few times to get familiar with it, and then I'll write the numbers for you, and you can read them!" Su Chen became a primary school first grade teacher, explaining lessons to the clever Bai Susu.

After Bai Susu carefully copied it several times, he was able to correspond one by one. Su Chen wrote a few numbers casually on the paper, such as "23", "101", "964", etc., Bai Susu could recognize them all and answered correctly quickly.

"Oh, not bad, quite smart!" Su Chen looked at the charming and charming Bai Susu, and couldn't help but praise her with a smile.

Bai Susu smiled faintly, with a kind of interest in learning new things, said: "Then, what is the calculation method?"

Su Chen said: "I'll teach you a few more calculation symbols. This "+" is a plus sign, and this "-" is a minus sign. When adding large numbers, you can write it like this..."

It took half a stick of incense, Su Chen told her the addition and subtraction symbols and calculation formulas, and then gave her some arithmetic problems, all of which were three-digit additions and four-digit additions, for training.

Bai Susu has long been thinking about calculations, but they are all replaced by abacus and words. Now that she has learned symbolic formula calculations, she has a good foundation, and she can draw inferences from one instance in an instant. It's easy to calculate.

"You have no problem with addition and subtraction, now we learn multiplication and division..."

Bai Susu asked with great interest, "Is it the ninety-nine multiplication song?"

Multiplication formulas have long existed in ancient China, such as "Guanzi-Waizhuan" says: "Filter opera to create six to meet Yin and Yang, and make ninety-nine to match the way of heaven." In "Han Shi-Wai Zhuan" it says: " Duke Huan of Qi set up a banquet in the court, and he did not wait for people to come, and there are ninety-nine people who will see him."

The ancient multiplication formula is from top to bottom, starting from "Nine Nine 81", so it is called Nine Nine Multiplication Table.

When Bai Susu was learning abacus as a teenager, she had learned a little bit of nine chapters of arithmetic from the private school teacher, so she was quite familiar with the nine nine formulas.

However, there is still a difference between memorizing ninety-nine formulas and mastering complex calculation formulas.

Su Chen wrote down the number "42x56" on the paper, and told her how to calculate and multiply to get the final integer 2352.

"It's amazing!" Bai Susu's eyes sparkled, and she could no longer maintain her usual calm expression. Seeing this novel method of number calculation, it was like a talented girl Xu seeing good poetry, and old beggar Fan Jiugong seeing fine wine , Su Chen saw that Yin Zi had the same long legs, and showed joy.

"Come and practice!" Su Chen wrote down a few multiplication numbers for her and asked her to calculate it herself.

After a while, Bai Susu quickly mastered this convenient calculation method based on his super comprehension ability, which is even easier to use than an abacus.

"I'll tell you about division as well." Su Chen explained all the calculations and methods of division in one breath, and infused Bai Susu with elementary school knowledge in modern mathematics, which she quickly mastered.

"Next, I will tell you a statistical method, make some tables, and then convert the text in your accounts into numbers and list them, marking the entry and exit and the remainder, so that accounting and auditing will be much simpler."

Bai Susu was completely stunned, as if there was a feeling of clearing away the clouds and mist.

"It turns out that it can be done!"

"There's nothing impossible, only unexpected!" Su Chen smiled slightly, feeling it.

Bai Susu looked at his embarrassing expression, and pursed her lips into a smile, this man has good talent, learning and personality, but he is a bit skinny!

Su Chen was stunned. Bai Susu's perfect face, like a snow lotus, seemed to bloom suddenly in front of him, which made people fascinated.

Bai Susu was stared at by his eyes, a little puzzled and curious, she also went up to him, and looked at him uncompromisingly.

At this moment, the faces of the two are close at hand, and the sound of each other's breathing can be heard. At this moment, their eyes meet, attracted, and frozen!

Su Chen's mind was a little blank and distracted, he was moved by the beautiful appearance in front of him, and attracted by that dignified, beautiful, graceful and luxurious temperament, his neck moved forward a little bit, and his big mouth wanted to be close to Bai Susu's red lips.

Bai Susu's heart was also jumping wildly, seeing Su Chen's face approaching a little bit, almost close to her cheek.

She was unprepared and inexperienced at this time, and she even didn't know what he was going to do?What should I do?I wanted to move my body, but for some reason, my body couldn't move.

"Sister Susu, it's getting dark, is Su Chen awake?" Peng Qingqing's voice came from outside the attic.

Interrupted by the voice, Bai Susu suddenly came back to her senses, avoiding her body and stood up, her heart skipped a beat, she gave him a sideways glance, and then replied, "I'm already awake."

Peng Qingqing continued to shout outside: "Tell him to go back home and prepare dinner. It's getting late, why hasn't he left yet?"

Su Chen smiled wryly when he heard the words. Just now, the girl yelled loudly, as if she had ruined a good thing she had done.

Only a little bit, my mouth could touch the cold and beautiful Bai Susu's lips.

He really wanted to see how this cold goddess would react when she was kissed, and whether she would slap him on the mouth.

"Su Chen, hurry down and go back to the mansion, Ling'er is hungry!"

There was also Peng Qingqing's urging voice from downstairs, this time it was a good time to take the blame.

If Su Chen hadn't gotten to know her well and knew Peng Qingqing's character, he might really have believed what he said. Now, she must be the one who was in a hurry to eat, and everything else was just an excuse.

Why does this Peng Qingqing want to eat delicious food? The key point is that although she can eat, her body is still very thin, her legs are so slender, you can't make me angry!

Su Chen waved his hand and said: "Susu, then I'll go back to the residence first, and you can go there in half an hour."

Bai Susu nodded, and suddenly reminded her: "You drink much less than Qingqing, you can't beat her, so be careful next time, don't always get drunk by her."

Su Chen nodded, thinking it made sense, if one day she got drunk and did something shameless to him, his innocence would be ruined.

(End of this chapter)