When various development projects in the camp were in full swing, Lu Bu was not idle, and he began to do something that outsiders could not understand, but it was extremely challenging. Pen & Fun & Pavilion www.biquge.info

Lü Bu was ready to be a teacher, and his students included two military advisors, the commanders of each battalion, as well as Wei Qi, Jia Kui, and Wang Xiang.

Professor Lu Bu's course, called "Military Calculations", sounds like a very lofty science. This is a course that Lu Bu focused on after fully figuring out the mathematical operation level of the generals under him.

In this era, mathematics still belonged to the category of "art" and was far from being as popular as in later generations. Many generals may not even have a clear grasp of the concept of multiples of ten, hundred, thousand, and thousand, let alone specific addition and subtraction operations. When people talk about numbers, they are vague hundreds, thousands, tens of thousands, but they don't have an accurate concept.

If accurate statistics cannot be made, this will be a big mistake for a force. Many times, it will also lead to the defeat of the whole army!

If Lü Bu's generals couldn't master basic math, how would they understand a slightly more advanced scale map in the future? How do you read the statistics? How to use various data for sand table deduction?

In Lu Bu's view, generals who can't do math have no future. The reason is simple, such a general can be wrong with even a simple comparison of forces, what kind of beautiful battle do you expect him to fight?

In Lu Bu's Chinese military tent, a large and flat wooden board was erected in the center, and Lu Bu held a slender charcoal strip in his hand, and neatly wrote down the ten twisted numbers from 0 to 9 on the wooden board.

This was the first time in half a year that generals who were familiar with Lu Bu had seen him write. Lu Bu has not used a brush to write for a long time, and any orders are conveyed through oral form.

Lu Bu looked at the people in the tent and said with a serious face: "This is a number created by my hard work in the past six months, you may not be used to looking at it, but in the future, you will definitely like these ten twists and turns." You can imagine how much time it takes to write the word 'one' in a small seal with a brush? And once you master this way of writing, you can write 1 in the blink of an eye! The gap between the word 'one' is not obvious, but how big the gap between 6 and 'Lu', 8 and '捌' is, you can write it yourself and try it. ”

Everyone then lowered their heads and tried to compare Lu Bu's notation with the traditional writing method, and found that the time gap between writing the same number was really large.

Lu Bu continued: "Everyone knows that 'military intelligence is like fire', and how to convey the most accurate military information in the fastest time is not only related to the life and death of hundreds of soldiers, but also related to the success or failure of a battle. I can guarantee that as long as you are proficient in mastering and using the numbers I have created, your reaction speed will be several times faster than that of the enemy in the future! ”

The people who could appear in the account had experience in leading troops to fight, so they naturally understood what it meant to increase their reaction speed, and they showed great enthusiasm for the ten numbers created by Lu Bu at this time.

About half an hour later, everyone in the account was able to skillfully write out the ten numbers from 0 to 9 in the sand table in front of them without looking at the big wooden board.

Because of the shortage of supplies, there was no extra paper in the army for people to practice, so Lü Bu asked the carpenter to make some square trays with rims, and in the trays filled with fine river sand for his "students" to practice and write.

"Now that you're familiar with the ten numbers, I'm going to show you what's really amazing. Nine is followed by ten, which can be written with a '1' in front and a '0' in the back, and after ten is eleven, it can be written with a '1' in front and a '1' in the back. Isn't it faster and easier to write like this? ”

Everyone nodded their heads, indicating that they understood Lu Bu's explanation.

"Jia Kui, let me ask you, how to write 'twenty-eight' with a new type of number? If you understand, you can come forward and write on the board. Lu Bu suddenly asked Jia Kui, directly from a dozen numbers to more than twenty.

Jia Kui listened very carefully, and had already mastered some of these rules, he immediately got up, came to the wooden board, took the charcoal strip in Lu Bu's hand, and wrote a somewhat crooked "28" on the wooden board.

Lu Bu turned his head and asked everyone in the account, "Do you think Jia Kui's writing is correct?" ”

Lu Zhi nodded first, his expression extremely engaged and serious. Chen Gong, Zhang Liao and others also nodded, believing that Jia Kui wrote correctly.

Lu Bu took the carbon strip from Jia Kui's hand, quickly wrote 100, 1000, 10000 on the wooden board, and then wrote 999, 9999, 99999 in the corresponding position below, and then said with a smile: "It's that simple!" It's a hundred, it's a thousand, it's ten thousand, it's nine hundred and ninety-nine, it's nine thousand nine hundred and ninety-nine, it's ninety-nine thousand, and if you follow the traditional method of counting, how much time does it take for you to write down these six numbers! ”

Everyone shook their heads and didn't try it at all. Fools can see that the larger the number, the more time will be saved by using Lu Bu's self-created digital record. Just that 99999, if you use a small seal to write, just this one number will have to write for half a day.

In order to show the power of the new number, Lu Bu asked everyone: "There are 19,842 people in our army, if we give each person 340 coins, how many copper coins will be needed?" Which of you wants to do the math? There's a plan on the long case over there! ”

Chen Gong was not afraid of trouble, so he asked the guards to help him get a pair of calculations and start to calculate skillfully.

When Chen Gong was calculating, Lu Bu also quickly listed the multiplication vertical form on the wooden board, and in the unclear eyes of everyone in the account, he quickly came up with the number 6746280.

Chen Gong lay on the ground for a full quarter of an hour, and the calculations were everywhere, and then he sweated profusely and came up with the same number as Lu Bu.

Lu Bu asked Chen Gong with a smile: "Do you want me to enlarge the numbers a little more?" ”

Chen Gong hurriedly shook his head, "This kind of loss, I can eat it once!" ”

The people in the tent laughed and thought it was an eye-opener.

Lu Bu said to everyone: "The way I did the calculation on the wooden board just now is called 'column vertical style', which can only be done after mastering the four operation formulas on the basis of being familiar with the new type of numbers. However, it is not difficult to master these formulas, and children as young as seven years old can memorize them backwards. With your minds, I don't think you will be able to grasp the mystery in less than ten days. Next, let's start with the simplest addition operation. ”

Lu Zhi, Chen Gong, Gao Shun, Zhang Yang, Xu Rong, Zhang Liao, Wei Qi, Jia Kui and Wang Xiang in the account have already seen the wonderful use of new numbers in the operation, and some of them may wonder how Lu Bu can create such a powerful set of calculation rules, but more importantly, they want to fully and quickly master the profound knowledge of "Military Calculation" in Lu Bu's mouth.

It is no exaggeration to say that Lu Bu is teaching them a new "dragon slaying" technique! Once you master military calculations, for individuals, it is equivalent to mastering an extremely powerful foundation for one's life.