"Shopkeeper Pan, don't you want to win?"

"I'm already over fifty years old, so I don't have so much thoughts about winning or losing. What's more, the waves of the Yangtze River push the waves of the previous one..."

"The previous wave died on the beach." Li Yu continued, but only saw Eunuch Pan's face full of embarrassment.

"Oh, it's this king who made a mistake. Don't blame Manager Pan."

"Well, Liulang, you are the master's family, Pan is just a slave. Don't say that you are unintentional. Even if you want to drag your way out and kill, we can't have anything to say." Pan Chenghou said softly.

"Yeah!" Li Yu touched his chin and pondered for a moment, then said loudly: "Pan Chenghou!"

Eunuch Pan was so scared that he almost threw away all the chips in his hand.

"Here!" He stood up and bowed like a conditioned reflex.

"Oh" Li Yu was also disgusted when he saw this and said lazily: "I ordered you to do your best to compete with me. Whoever calculates the total number of the account book first will win."

"Yes!" Pan Chenghou was still respectful

"Shopkeeper Pan, this won't let you play in vain. Regardless of the outcome, there will be a heavy reward, and it's the kind you can't imagine!"

"this?"

"Pan Chenghou, do you think I have eaten enough and I have to show you what a magical thing? Let me tell you today.

As he said that, Li Yu opened the box and took out something from it.

Pan Chenghou looked at it and saw that the object was a wooden utensil, about one foot long and six inches wide. It was a mahogany frame with vertical bars in the middle, and the bars were wearing some round beads in Shanghai.

The middle of the vertical bar is divided into two by a wooden strip, with two beads on the upper half and five beads on the lower half.

"This is!"

"Abacus! This thing has a much faster calculation speed than all calculation pieces. If you only do addition and subtraction, you're probably calculating... Well,... in short, nothing can match!"

Li Yu was so excited that he almost spoke out the calculator.

As a great invention in Chinese history, abacus still had strong vitality until his previous life.

There are overwhelming advantages for calculators in addition and subtraction. However, with the rapid development of industrialization, when calculators are sold for three to five yuan per person, the vitality of the abacus will naturally end.

After all, learning is high, although the principle is simple.

But to play well, you have to go through a period of special training. In comparison, if you buy a calculator for five yuan, you can get started with it by humans, and it also has a voice function. A genius will practice planning.

But the role that abacus can play in this era is too great.

The calculation is actually the ancient vertical calculation method. Zu Chongzhi relies on this set of things to calculate the pi, but the disadvantage is that the process is complicated and takes up too much space...

Especially when calculating multiplication and division or dividing squares, you often have to put a calculation sheet full of ground.

Compared with calculations, abacus is like the advantage of crushing the Maxim machine gun against the Mosinnagan bolt-action rifle.

Seeing Li Yu holding the abacus and dancing, Pan Chenghou felt funny in his heart, "It's the boy's character to be low. Just play with him today. In short, just make him happy. As for winning or losing, or how much you lose, isn't it controlled by yourself?"

Thinking of this, he said respectfully: "In this way, please give me advice."

He spoke politely, but Li Yu saw that the corners of his mouth were slightly raised, and he knew that he still looked down on this thing.

I thought this was normal, and it would be a shock to your chin later.

Besides, Li Yu didn’t sleep in the middle of the night yesterday for this scene. He was mainly recalling the mantras and playing methods of the abacus. This was learned by the interest class in elementary school.

I almost returned it to the teacher for twenty years. Finally, the foundation of the boy's skills was solid. I thought about it for a long time to make up for the mantra.

But the flexibility of fingers cannot be recovered in a short period of time.

This is not a problem. No matter how slow it is, it is faster than moving around with a small bamboo stick.

Li Yu took the abacus and the account book and walked to a small table next to him, "Shopkeeper Pan, this big table is left for you to prepare."

"Liu Lang Renhou, at this time, he still knows how to get down in size."

"Hey hey, you must convince your manager Pan's loss, otherwise you will be defeated." Li Yu smiled.

"Is Manager Pan ready?"

"It's okay"

"Then let's start."

Pan Chenghou opened the account book and began to calculate it. He noted that the account books in the building were messy, all of which were recorded. How much does a pot of Jinlingchun cost, how much does a plate of roasted pork cost, and how much does a bowl of Songcao soup cost. There are so many things that are enough to make people feel headache after a day.

The two sides compete to calculate the sum of the prices of each page, and then calculate the sum of the entire account book.

It’s not difficult, but there are many numbers and large projects, which is just a little hard work for Pan Chenghou.

But as soon as he put the calculation plan on the table, he knew that the situation was not good.

A "da" sound came from the ears.

Turning his head and looking, he saw Li Yu holding a brush in his hand, fiddling repeatedly in the wooden frame.

The "da" sound was not very smooth at first, but as the account pages turned more and more, the sound became more and more dense.

Pan Chenghou was a little dazed for a moment, because the speed of Anding King turning the page was obviously beyond his expectations.

Li Yu was amused. Not only was the calculation speed far better than the calculation of the calculation, but he also had an overlooked advantage - he could hold a pen and plan the calculation, and then record the results after obtaining them.

But it is not that convenient to play with calculating the chips. Often, you have to find a pen to record the results after putting a table of bamboo chips.

As someone who has been playing with the calculations for a lifetime, Pan Chenghou is aware of all the secrets of the joints. At this moment, seeing Li Yu's speed is extremely fast, he is also aroused.

I immediately gathered my mind, turned a deaf ear to the sound of the abacus, and began to fiddle with the calculation plan.

After about a cup of tea, Pan Chenghou had just calculated 20%, but heard Li Yu say, "Shopkeeper Pan, I won!"

His hands trembled, and he fell on the table, looking at the young king with disbelief.

"I won't talk about the pages, the total number is twenty-five silos and thirty-two silos." As he said that, Li Yu handed the account book to Pan Chenghou.

The latter took it tangled and opened it, and saw a number written in the lower left corner of each page.

He found it incredible and did not care about the rudeness, and compared the numbers on the first ten pages with his settlement results one by one.

All the results matched!

"Liu Lang, Liu Lang..." Pan Chenghou's expression was frozen and his eyes were empty. Liu Lang Liu Lang said several times, but he couldn't say the following words.

Then, he put his butt on his chair, touching the bamboo chips with his hands, and his lips trembled.

He understood that the skills he had learned throughout his life had no value in front of this simple device called Abacus...

Forty years, forty years...

The technique of planning that I spent all my energy and rely on to become famous has no meaning of existence since then.
Chapter completed!