Early in the morning of the second day, Liu Yuanshan did not train with everyone, but took Yanran, Xiaoqing, Liu Da and Liu Er to Zhaowangzhuang to measure the land. Pen × fun × Pavilion www. ｂｉｑｕｇｅ。 ｉｎｆｏ

Of course, Wang Xiucai and Second Uncle Mao, who are witnesses, are also going. Both of them were curious about why Liu Yuanshan brought his female dependents, but they also had a tacit understanding and didn't say anything.

In the Ming Dynasty system, five feet one step, two hundred and forty steps for one acre, and one hundred acres for acres.

That is to say, two hundred and forty steps is one acre of land, and one hundred acres of land is also called one hectare of land.

The ruler of the Ming Dynasty is about the same as the modern ruler, about 32 centimeters of the current unit of measurement, five feet one step is a distance of one meter six, the step here is not a step in the pure sense, but a step on the left and right feet is a step, it is reasonable to say that even if the left and right sides are not one meter six, but the ruler in order to increase the tax of farmers, the standard of steps from the Qin and Han dynasties to the Sui and Tang dynasties and then to the Ming and Qing dynasties, is getting bigger and bigger.

One acre of land in the Ming Dynasty was almost 614.4 square meters per mu when converted into a modern square, which was slightly smaller than the number of acres in modern times.

Although Wu Wenjia's land belongs to Zhao Wangzhuang, it is not far from Liujia Village, from the foot of Balding Mountain, the horse widow's house, at most no more than one kilometer away, this place is about 100 acres, it is a good paddy field, not only the water flow is abundant, the land is also fertile, the only bad thing is that it is slightly narrow and long, and it is sandwiched in the middle by the land of Zhao Yuanwai's family.

The land of the Wu family is roughly rectangular, but it is not a perfect regular figure, in which the width is different, the length is different, when measuring the land, the area of this rough rectangle must be divided into several pieces of statistical acres, so as to be able to ensure accuracy. This is also a common method in the Ming Dynasty.

After formulating the measurement plan, Wu Wen's family went into battle, and Liu Da and Liu Er came up to help together, and several people pulled the rope with a scale and began to measure.

The first piece of land is trapezoidal, measured to be sixty-four paces long and forty-eight and fifty-four steps wide! According to the modern point of view, it is a matter of trapezoidal area, and the square step divided by two hundred and forty is the area of the land.

Liu Yuanshan didn't know what method Wang Xiucai used to calculate, but he frowned and pondered for a long time, writing and drawing on paper, and the result didn't come out for three minutes.

Here, Liu Yanran had already held the pen and paper in her hands, and after a little calculation, she came to a conclusion, and said in a low voice: "The first piece of land is thirteen and six acres, oh no, it is thirteen acres and six points!" "Although the Ming Dynasty also had the concept of decimal point, it could be read differently.

"Huh?" Wang Xiucai raised his head in surprise and glanced at Liu Yanran.

The rest of the people, such as Wu Wen and Second Uncle Mao, also looked at Liu Yanran.

Liu Yanran's face suddenly turned red, and she was also a little nervous, she didn't look so confident, and said, "Otherwise, I'll do it again, don't make a mistake!" ”

"Forget it!" Liu Yuanshan responded with a smile.

Xiaoyu and Xiaoqing held up a wooden board, Liu Yanran picked up the pen and calculated it again, and calculated the result in less than a minute, and said: "That's right, I calculated it again, it's thirteen acres and six points!" ”

"Whoa......" Wang Xiucai closed the abacus in his hand, shook his head and sighed.

"What? Right? Wu Wen was very concerned about the number of acres of his land, he didn't believe in Liu Yanran's algorithm, but looked at Wang Xiucai.

"It's weird!" Wang Xiucai said a little dejectedly: "That's right, it's really thirteen acres and six points." "Being compared to a little girl, it's no wonder that he doesn't hang his head.

You must know that he has calculated it once, and people have already calculated it twice, and he used the abacus to calculate, but people only used the pen to calculate it with their bare hands, and the difference is that the layman can also see it.

"Ah, that's right?" Second Uncle Mao couldn't believe it.

"Yes, really, alas......" Wang Xiucai had a bitter face and glanced at Liu Yanran, Liu Yanran smiled with a smile, her face was full of confidence, her eyes were bright, her skin was like snow, and she looked a little more charming than she had been a little year ago.

"It's not simple, Liu family girl, you can be regarded as a female talent." Second Uncle Mao gave a thumbs up.

Wang Xiucai said: "It should be a girls' school book!" ”

In fact, Wang Xiucai can't be blamed, he has been concentrating on reading, and he is only slightly involved in the path of mathematics, and he is not profound, if an old account room uses an abacus, he can naturally compare Liu Yanran's calculation speed.

But there are a few more people who go to the bookkeeping office!

"Okay, since it's okay, let's continue to measure!" Wu Wen took the rope and continued to measure the number.

The second plot is still trapezoidal, with a length of 86 paces and a width of 54 and 32 respectively.

Liu Yanran smiled slightly, this time she was much more confident, and calculated again before Wang Xiucai, and said to Wang Xiucai with some provocation: "This time it's fifteen acres and four points, I don't know if I'm right?" ”

Wang Xiucai looked at her and could only smile bitterly, and said, "You wait for me first!" After a long time, it was reported: "Yes, it is fifteen acres and four points." Looking at Liu Yanran curiously, she asked, "You don't have an abacus, how did you figure it out." ”

"Master Xiucai wants to know, then I'll go back and teach you......" Liu Yanran smiled, Chu Chu moved.

Wang Xiucai smiled bitterly, very aggrieved.

Next, everyone continued to measure, and most of the land was trapezoidal, with an area of 21 acres and 9 minutes and 32 acres and 5 points. The last stretch of land is a fairly regular triangle.

"How do you count this piece?" Wu Wen didn't know arithmetic, only knew the simplest mathematical rules, and his head was a little big when he saw a triangle.

Wang Xiucai looked at the ground and didn't speak, but looked at Liu Yanran with a smile, and said secretly: I'm not as fast as you in arithmetic, but you don't understand the truth of this calculation, you can't do this piece of land.

Liu Yanran saw him smiling wickedly, she knew what Wang Xiucai meant, and she was not shy, so she pointed directly to the piece of land and said to Wu Wen: "Brother Wu, you can measure this width first, and then pull it up from the middle of this ridge to the corner that sticks out." ”

Isn't the area of a triangle the base multiplied by the height divided by two, and who wouldn't?

Liu Yanran was proud.

Wang Xiucai was shocked!

"How? Master Xiucai, is what the little woman said right? Liu Yanran asked Wang Xiucai with a smile.

"Yes!" Wang Xiucai took a deep breath, and a sense of frustration arose from the bottom of his heart.

Wu Wen listened to Wang Xiucai's words, and then continued to measure, and finally came to the data of the triangle as 68 steps wide and 34 steps high.

Liu Yanran once again calculated the answer perfectly, and said, "This is thirteen acres and nine points." ”

Then he read the words in his mouth, added all the acres together, and after a while, he came to a conclusion, and said to Wu Wen: "Brother Wu, your land is not a hundred acres together, I calculated that it is ninety-seven acres, right?" ”

"Amazing, worthy of being a girls' school book, I'm really convinced!" Wu Wen gave a thumbs up: "When my father was alive, he said that this land is a total of ninety-seven acres. ”

"Alas!" Wang Xiucai sighed and said, "I don't live anymore, I'm a talented master, but today I was compared to the girls' school book." ”