Soon, someone sent a plate of yellow and clear copper coins.

Lu Ting got a few branches on the spot, asked Hongling to bring a ball of thread, and then tied the branches with thread.

What is this for? Zheng Yanzhi and Hongling were confused when they saw it, didn't they want to improve their ability to calculate, but also to improve their accuracy, they didn't use a pen, they didn't use paper, and they didn't have any calculation skills.

"What are you doing here?" Hongling whispered to Fuzhi on the side.

Fu Zhizhang was confused, shook his head and said, "I don't know, it's the first time I've seen my son do this." ”

Not only did he not see clearly this time, but Fuzhi found that now he was becoming more and more unable to see his son-in-law, and he was not visible on weekdays, and suddenly he had a lot of ideas or ideas.

Hongling wanted to ask her own young lady, and before she could speak, Zheng Yanzhi gave her a silent gesture, in fact, Zheng Yanzhi couldn't understand it, but seeing that Lu Ting's serious face didn't look like he was playing, she decided to be patient to see what he was going to do.

Not to mention anything else, there are too many cases of Lu Ting turning decay into magic in terms of clear calculation, and it is necessary for him to give him a little confidence.

Under the puzzled eyes of everyone, Lu Ting first tied a shelf about one foot three inches long and half a foot wide with branches, with a small branch in the middle, and then threaded the chopsticks on the table into copper coins, Zheng Yanzhi saw very clearly, each chopstick was dressed with seven copper coins, no more, no less, and then tied the chopsticks with copper coins to the shelf at a certain interval, which was indescribably weird.

It's not like pretending to be a ghost, looking at Lu Ting's appearance, it seems to be a little casual, but it can be seen accurately, and there seems to be a rule to follow, but it's just weird how you look at it.

Tie the last chopsticks, Lu Ting was not idle, and engraved the words "one, ten, hundred, thousand, thousand, thousand, one hundred thousand, million, million, million, ten thousand, ten thousand" on the last chopstick, and after the engraving was completed, he could finally breathe a long sigh of relief, and the simple version of the abacus was done.

During the assessment on the second floor of the guest house, Lu Ting was surprised to find that there was no abacus yet, and the way to calculate it was to sign chips and bead chips, which was very inconvenient.

"Miss Shiba, do you see anything special about this thing?" Lu Ting didn't reveal the cup as soon as possible, and had the heart to test the little girl.

"It's the first time I've seen this kind of thing" Zheng Yanzhi hesitated, and said with some hesitation: "If the slave family is not mistaken, this is a tool to assist in calculation, a bit similar to the bead chip, but it seems to be very different from the bead chip, and the slave family can't guess it for a while." ”

Lu Ting clapped his hands and said: "Miss Xiaozhi is really talented and smart, you can see it at a glance, that's right, this is an auxiliary tool for calculation, and the role of bead chips and lottery chips is the same, they all help calculate the results, and the role is the same, but the efficiency is much higher than that of bead chips or lottery chips." ”

A sentence of talent and intelligence, Zheng Yanzhi blushed a little when she heard it, she didn't understand it just now, and when she saw Lu Ting's lettering, she faintly felt that it was related to Ming Calculation, and she was a little embarrassed to accept this praise.

"The efficiency is much higher than that of the beads and the signing? Please also ask Lu Gongzi to explain one or two. Zheng Yanzhi said expectantly.

It's hard to say in other aspects, but in terms of clear calculations, Zheng Yanzhi still has confidence in him.

Lu Ting nodded and explained: "Miss Xiaozhi, you see, each pillar is now replaced by chopsticks, representing a value, and there is only one digit, ten, hundred, thousand, you all understand, this should not be difficult to understand." ”

"The slave family can understand, but why are there only seven copper coins per pillar? It is also divided into upper and lower parts, with two in the upper part and five in the lower part? Zheng Yanzhi said with some doubts.

Obviously, it is every ten into one, and it stands to reason that ten copper coins should be appropriate, but this special auxiliary tool made by Lu Ting is only seven, which seems a little unreasonable.

Lu Ting clapped his hands and said: "This question is well raised, it is divided into two parts, in fact, it is to distinguish well, the two copper coins in the upper part, each one represents five, and the copper coins in the lower part, each one represents one, Miss Xiaozhi, think about it, if you count too much, you have to count one piece, it's a bit laborious, and it's much easier to use this method." ”

"According to Childe, the upper part represents ten, the lower part represents five, and there are fifteen in total, why isn't there only one in the upper part and five in the lower part, isn't it more obvious at a glance?"

"No matter what, you have to make some preparations, the reason for preparing two pieces is to prevent some special situations, for example, it is clear that it is more than one out of ten, but some numbers are not every ten into one, for example, in some places there are sixteen taels per catty, if this happens, fifteen is not exactly one into one, of course, there are two pieces on it, I personally feel that it is also beautiful."

It turned out that this was the case, Zheng Yanzhi nodded convincingly, and said with some eagerness: "Lu Gongzi just said that it is faster than those of the beads, I wonder if you can demonstrate it?" ”

No matter how good it is, it's useless, you have to test it to know.

Lu Ting sat down, set up the copper coin that served as a bead on the simple abacus, and said, "I will go through the process from one to one hundred now, Miss Xiaozhi is optimistic." ”

"The slave family waits." Zheng Yanzhi's gentle voice sounded behind Lu Ting.

Seeing that Lu Ting wanted to demonstrate, she didn't need to shout, Zheng Yanzhi took the initiative to walk behind Lu Ting, her eyes wide open, for fear that she would miss any of Lu Ting's actions.

Lu Ting dialed a copper coin upwards from the bottom of the column marked with the number, and said: "The single column, the lower part, each copper coin represents one, this is one." ”

Dialed two copper coins from below, and said patiently: "This is two, Miss Xiaozhi is optimistic, there are three copper coins on it, and the result of one plus two is three, which is equivalent to one plus two, and I see that the copper coins above are used when adding to three." ”

Lu Ting took a copper coin from above, said "three down five divided by two", and dialed back the copper coin below.

Seeing Zheng Yanzhi watching very quietly, Lu Ting knew that it was not difficult to understand with her IQ, and she didn't explain it anymore, while reciting the abacus mantra, she tried to speed up the calculation as much as possible.

Zheng Yanzhi was stunned all of a sudden, a few branches, a pair of chopsticks, a ball of thread and dozens of copper coins, these things that can be said to be too ordinary to be ordinary, when they arrived in Lu Ting's hands, they simply turned decay into magic, and Lu Ting's hands flew up and down, brisk and elegant, like butterflies dancing among the flowers, Zheng Yanzhi was stunned for a while.

After coming back to her senses and looking at Lu Ting's copper coin, Zheng Yanzhi was surprised to find that Lu Ting's kung fu had been increased to thirty-nine.

It's just speed.

Just looked at it for a while, Zheng Yanzhi found the benefits of this auxiliary tool: whether it is a bead chip or a bead chip, it needs to be divided into different values of chips, when calculating, you must first distinguish the chips with different values, and then take them out one by one, it takes some time here, but you don't need it in the auxiliary tool, just dial the copper coin directly, no matter where you count, as long as you look at the copper coin above, you will know what the result is, if it is a bead chip and a sign, you have to stop and count it, which takes time.

To Zheng Yanzhi's surprise, Lu Ting seemed to have quick calculations, such as "one on two, two on two, three down five to two, four down five to one, two to eight into one" and so on, at first Lu Ting was still a little rusty, but his speed increased significantly, and he was a little careless and kept up with the rhythm.

Suddenly, Zheng Yanzhi's eyes widened again, and Lu Ting, who was calculating, saw that he was holding an auxiliary tool in his right hand, stretched out his left hand to pick up a bamboo skewer, and picked up a piece of candied fruit and threw it into his mouth. When eating, the speed did not slow down significantly.

That's pretty impressive, isn't it?

"One hundred, one to nine, one to one, live together, call it a day." Lu Ting finished the last number, let go of his hand, looked at the copper coin representing 5050 on the simple abacus, and nodded with satisfaction.

I haven't practiced this for a long time, and I'm born, but fortunately, the foundation is still there, the only unpleasant thing is that this simple abacus is too simple, the copper money is thin, it's not easy to use force, and it occasionally gets stuck when dialing, which obviously affects the speed, and then I like to listen to the sound of the beads "popping" the most, and it's very exciting when I play fast, and the fun of using copper coins is obviously missing.