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"Sir!" The housekeeper who heard the noise outside came in.

He glanced at Yan Kai somewhat coldly: "Please pay more attention when you are studying."

Although Mr. Zheng is usually very cool, he actually got timid at this time and defended with a guilty conscience: "I was just discussing these nine chapters of arithmetic with him."

"Hey!" The housekeeper sighed: "Sir, I asked you to urge me to study. You have to go out to listen to books during the day, so I'm sure. After you come back, you have to continue listening, so I'm sure. .”

"But on the way back, you promised me that you would study hard at night. It should be noted that in our Zheng family, words are worth more than gold. If you do this, I will not be able to explain it to the master."

Yan Kai was originally a little unhappy to be kidnapped by this young master today, but later this young master treated him really well and even treated him to the same meal, so Yan Kai got rid of the grudge in his heart.

Some even regard Mr. Zheng as their friend. Now that they see him being criticized by the steward, they can't help but defend him: "Mr. Butler, Mr. Zheng and I are indeed discussing the Nine Chapters arithmetic."

The housekeeper looked kindly to Mr. Zheng, but when he heard what Yan Kai said, his eyes turned cold and he looked at him and said, "Please find out your identity, and you also know Jiu Zhang arithmetic?"

After that, he said to Mr. Zheng: "If you have anything you don't understand about arithmetic, you can ask me."

He also listened to Yan Kai's storytelling today. Although it was interesting, it was all in vernacular.

There was never any reference to scriptures when speaking, so he was sure that Yan Kai had not read any books, but just heard such an interesting story somewhere.

This sentence made Yan Kai a little embarrassed. What happened to my identity? Aren't you also a housekeeper? It's like [-] to [-] yuan.

There are also these nine chapters of arithmetic. I don’t know how the latter are, but aren’t the first chapters at the level of a primary school student? Who do you look down on?

"What Butler Zheng said, although I haven't read Chapter Nine Arithmetic before today, the questions above are really not difficult. I just read the first two chapters. If the questions in these two chapters are the same, I really Got it all."

Hearing what Yan Kai said, the housekeeper didn't believe it even more. There are only nine chapters of arithmetic in total. You have read two chapters in just a moment. Who are you fooling?

You must know that his father is the housekeeper of the Zheng family. He also studied ten books on arithmetic since he was a child. Among them, "Nine Chapters on Arithmetic" took almost more than a year to become proficient.

This Yan Kai actually dared to say that he understood the problems in the previous two chapters.

This brat is the biggest stumbling block for the young master to study!

The steward stepped forward and said, "Since you said you understand everything, why don't I test you to see if you are qualified to discuss the Nine Chapters of arithmetic with the young master."

"Okay, how about we compete?" Yan Kai also got angry and said without showing any signs of weakness.

"Sir, please lend me your pen and paper." The steward bowed and said to Mr. Zheng, then handed Yan Kai a pen and a piece of paper.

Yan Kai had taken a few calligraphy classes in elementary school, and he had used this brush at that time.

He tried to pick up a pen, but the housekeeper noticed it, and he knew in his heart that Yan Kai was a loser who couldn't even hold a pen.

It would be best for me to use this to drive him out, so as not to affect the young master's study.

You must know that if the next time the master randomly checks the young master's homework, the young master cannot pass the test, he, as the supervisor, will also suffer.

He said to Mr. Zheng: "Sir, please give me a question."

Mr. Zheng didn't expect that he would tell a lie casually in his desperation, which would lead to Yan Kai competing with his butler.

However, he also doubted whether Yan Kai had deceived him just now. How could anyone read a book so quickly and still claim that he understood it?

So he also wanted to test whether Yan Kai really understood everything.

"Today there is a field of thirty steps wide and 32 steps vertically. Question: How much is the field?"

Of course he wouldn't follow the examples in the book. His housekeeper had already memorized the nine chapters of arithmetic. If it was just numbers, what's the point?

Yan Kai rolled his eyes and blurted out: "Four acres."

Who do you look down on? In the question just now, fifteen becomes thirty and sixteen becomes 32. They are both multiplied by two. So wouldn’t the answer just be multiplied by four?

Just as the housekeeper was about to pick up the pen, he was stunned when he heard Yan Kai's answer.

He looked up at his young master and found that Mr. Zheng was also looking at Yan Kai with a surprised look on his face.

Considering that the competition between the two was impromptu, it was impossible for my son to agree on the topic with the other party in advance.

"Next question!" Yan Kai said without any clue.

Mr. Zheng asked another question uncertainly:

"There are 42 steps by Keida Hiroshi, and [-] steps in length. Question: How much is the field?"

Before time travel, Yan Kai really didn't know what Guitian was, but after time travel, he followed Yan Laoer to the ground.

We know that the so-called Guida in this era is a triangular field. Isn’t this problem just about calculating the area of ​​a triangle?

What's so hard about this?

Multiply 42 by nine and you get 370 eight.

But it's a bit more troublesome to change to mu.

Holding a pen and paper awkwardly, I divided 138 by 240 and quickly figured out that the answer was 0.575.

So he answered again: One point, five hundred and seventy-five acres.

The housekeeper had just written a few numbers on the paper when he heard Yan Kai's answer.

But this time, unlike the previous question, he could calculate it verbally.

So he wiped the sweat from his forehead and continued to calculate.

Mr. Zheng also took a pen to calculate together, and at the same time took out the calculation chips.

The use of decimals is included in Chapter Nine of Arithmetic, but it is called "decimals" in the book.

And the way of writing is not to write directly after the decimal point as in later generations. The specific answer to this question is probably one acre and five-tenths and seven percent and 5.00% of the acre.

Although the housekeeper and Mr. Zheng didn't quite understand what Yan Kai said: [-], after such a comparison, they found that the three numbers [-] just corresponded to the decimal they calculated.

"Hiss..." The housekeeper took a breath and looked at Yan Kai like a monster.

The fingers pointing at him began to tremble slightly: "You... how did you calculate it?"

The calculation speeds of the two sides just now were very different. Mr. Zheng had just asked the question casually, so it would be easy if he only calculated to 370.

The precise number of digits behind is much more complicated.

But Yan Kai drew a few ghost-like symbols with a brush and figured out the correct answer in the blink of an eye. It was a decisive decision.

"Just...division! What's wrong?" Yan Kai pointed to his division formula speechlessly.