“Herby style!”

Zhang Cang frowned. He had never heard of this calculation method before, and he couldn't help but feel even more curious.

"That's right, the firm style, I made a vertical style in my heart, so I calculated it faster." Li Yang smiled.

When he was in Pei County, when the merchants used the plan, Li Yang originally thought that people in ancient times could not multiply the formula, so he thought that he calculated faster than Zhang Cang, which was the result of multiply the formula.

However, it was not until a few days ago that Li Yang wanted to learn about the preliminary calculations of mathematics today because of a math textbook, but he was surprised to find that multiplication formulas have long been popular.

The 99 multiplication table in my country originated very early, and it was 999 at the time of Duke Huan of Lu during the Spring and Autumn Period. It was written in "Guanzi" between the Spring and Autumn Period and the Warring States Period. The book mentioned that "the number of 99 is written to respond to the way of heaven." In the Warring States Period, the 99 mantras were quite popular. In the Qin Dynasty, all those who know the text and understand the numbers are familiar with memorizing the 99 multiplication table.

Moreover, in addition at this time, if you see "half and one", isn't this the meaning of 0.5+0.5=1? This means that at this time, there are already scores.

This really surprised Li Yang.

At the same time, I was also puzzled why, with the multiplication formula, last time in Pei County, not only did the merchants not count themselves, but even Zhang Cang, a mathematician of this era, could not count himself?

After careful study, Li Yang understood the method and found that the reason was actually vertical.

Yes, it is the vertical formula listed in the draft book by later generations.

Addition vertical, subtraction vertical, multiplication vertical, division vertical.

Because of the help of these vertical forms, we can easily calculate it using vertical forms no matter how many digits it is.

However, in this era, there is no vertical style.

They cannot use a pen to list a vertical formula on paper, and then calculate. Instead, they have to use calculation sheets to place them on the ground and on the table to calculate, so they are called calculation.

This is why although they are familiar with the multiplication formula, they still find it difficult to calculate the formula of multiplying three-digit numbers.

As a time traveler in later generations, although Li Yang used mental arithmetic and did not list the vertical form on the draft paper, he also brought the vertical form into his mind, so he quickly calculated it.

Therefore, as long as you impart vertical style to people of this era, you can almost improve their computing power in one go.

In order to let Zhang Cang know at a glance what is a vertical calculation method.

Li Yang did not say too much nonsense, so he took a piece of paper and listed the formula that was originally in Peixian on the paper.

However, Li Yang looked a little awkward in this vertical shape on the paper because they were not Arabic numerals, but Chinese characters.

Fortunately, this does not affect vertical operation.

Based on the multiplication formula, Li Yang explained to Zhang Cang, and soon Li Yang calculated the result below the vertical.

Zhang Cang was a mathematician of this era. He had a talent for mathematics that others did not have, so he could do it at first glance. So after watching Li Yang's entire calculation process, Zhang Cang was shocked and opened his mouth wide, which made Li Yang a god!

There is no need to use one calculation piece after another, and arrange the two sets of numbers directly on paper or on the ground, and use multiplication formulas to easily calculate it. This calculation method is simply a shocking soul for Zhang Cang!

"This vertical method is simple, fast and extremely exquisite! Sir, I'm here to receive the teachings today!"

Zhang Cang was so excited that he was so excited that his eyes shone. He quickly bowed to Li Yang and bowed deeply.

Li Yang smiled and said, "There are more!"

After saying that, Li Yang used the vertical calculation method on the paper to calculate several examples of multi-digit addition, subtraction, and division equations, which directly made Zhang Cang stupid.

As a mathematician, after seeing the vertical operations of addition, subtraction, multiplication and division, he knew that there would be no need to calculate the calculation in the future!

Moreover, after listing this vertical formula, even if a person is not smart, he can easily calculate the results quickly by adding, subtracting, multiplication and division of multiple digits.

In other words, as long as this vertical calculation method is implemented, it will benefit countless people.

From now on, even an old farmer would be able to easily solve addition and subtraction as long as he could learn the method of vertical operations a few times.

Zhang Cang, who was amazed, looked up and asked excitedly: "Sir, did this vertical operation method invent it?"

Li Yang said bluntly: "This is a calculation method that Benxiang mastered when he was a child."

"Sir, this... was invented when you were young?" Zhang Cang was stunned!

"this……"

Li Yang was stunned and found that he had misunderstood. However, when he thought, there was no such calculation method at this time, and it seemed difficult to explain it.

So I had to nod my head shamelessly: "Well, you are right, this is what I realized when I was a child!"

hiss!

"……………” Zhang Cang took a deep breath, and was so shocked that he couldn't even speak.

OMG!

When he was a child, the Prime Minister of the Central Committee actually understood such a sophisticated method of calculation in his childhood...

Genius, he is really a mathematical genius!

I thought I was also considered a mathematical genius in the world, but I didn't expect it...

Now compared with the Prime Minister, I am just a scumbag!

Even Prime Minister Yi left himself 108,000 miles away when he was a child.

At this time, Zhang Cang looked at Li Yang with great admiration, and he was shocked!

Knowing how to calculate difficult problems can only show that you are smart at most.

However, being able to invent an advanced computing method is not just clever, it is not at the same level at all.

Since the Warring States Period, fortune-telling has been regarded as a magic weapon for operations by the world.

But now it seems that compared with Li Yang's vertical operation, it has become a slag.

At this moment, Zhang Cang sighed without being excited: "In today's world, only the Prime Minister of the Central Committee is the one who dares to be a master of mathematics!"

“…………”

Li Yang was amused and crying.

Fortunately, he became shameless and not only did he not blush, but he was a little proud.

"Zhang Cang, in the mathematics textbook, you can promote this vertical calculation method!" Li Yang explained.

Zhang Cang quickly bowed: "Here!"

At this time, Li Yang took the paper that had previously listed the equations and listed an Arabic numeral next to each equation.

"Sir, what symbol is this...?"

When Zhang Cang saw the numbers written by Li Yang, there were symbols such as plus signs, minus signs, multiplication signs, division signs, equal signs, etc., and frowned and asked.

Li Yang was not in a hurry to answer, but wrote out the Chinese characters zero to nine in the blank space on the paper, and then added the following Chinese characters to correspond to the Arabic numerals that wrote them.

After writing all of it, I put down my writing and said to Zhang Cang: "This is a simplified number invented by the original phase. These numbers correspond to zero to nine. Look, aren't it very simple? And they are more convenient for vertical operations?"

After hearing Li Yang's words, Zhang Cang naturally saw the superiority of these simplified numbers at a glance. He immediately looked at Li Yang in surprise and asked, "Sir, this... did you invent it?"

Li Yang thought about it and found that the Arabic numerals were developed by Baghdad, an Indian scientist in the 3rd century AD. However... now he wrote it in 209 BC, so this is naturally not considered invented by India.

So, Li Yang shamelessly admitted again: "Yes, when I was a child, I thought the small seal script was complicated and difficult to write, so I used them to replace the small seal numbers when I was very young."

"ah?"

After hearing this, Zhang Cang was amazed again: "I didn't expect that adults would have been so extraordinary when they were childhood! I admire him again."

Li Yang waved his hand: "It's just a little bit, it's insignificant!"

When Zhang Cang heard this, he even said in his heart that the Prime Minister of the Central Committee is really a modest person.

In his opinion, everyone said that the Prime Minister of the Central Committee was frivolous and arrogant, and that the world did not understand his talents. If he really understood his talents, he would find that the Prime Minister's previous crazy words could only prove the ignorance of the world.

In order to allow Zhang Cang to more intuitively understand the superiority of Arabic numerals, Li Yang also wrote three-digit, four-digit and five-digit numbers to let him understand that using these Arabic numerals as mathematical applications would be extremely convenient.

Zhang Cang, who was amazed, quickly pointed to the symbols such as plus and minus and asked: "What are these numbers?"

Li Yang shook his head: "This is not a number, but a symbol. This is a plus sign, this is a minus sign, this is a multiplication sign, this is a division sign, this is an equal sign. With these signs, you can make the equation. For example, look at this..."

This discussion lasted for a whole day.

Li Yang used all the mathematics of later generations from shallow to deep, and discussed it with this ancient man, which made Zhang Cang stunned for a moment, wondering if the person in front of him would not be a human, but a god.

In short, after a day of discussion, Zhang Cang just finished bowing down and bowing.

Of course, Li Yang also told him that these simple numbers should be promoted in the textbooks with symbols, formulas and vertical forms.

Yes, Li Yang is going to compile a primary school mathematics book that is exactly the same in later generations!

Because mathematics is very important, it will promote the progress of various disciplines such as biology, chemistry, astronomy, etc.! Therefore, the subject of several must be strictly required.

Fortunately, Zhang Cang is really a math genius, and it is obvious at all.
Chapter completed!