Zhenguan Leisurely King

Chapter 307 Addition, Subtraction, Multiplication and Division
Dongxue is also a talented woman. After writing and explaining, Wang Pingan said excitedly: "Understood, young master, I understand. Adding a zero after this will increase the amount by ten times."

"That's right, children can be taught." Wang Pingan said with satisfaction.

"However, young master, these Arabic numerals just simplify the way of writing accounts, and the other Dongxue has not changed anything?" Dongxue asked a question.

Wang Pingan said with a smile: "Knowing these numbers is just the foundation, and now the young master will continue to teach you the application of these numbers."

Wang Pingan picked up the pen again, wrote the four operation symbols of "addition, subtraction, multiplication and division" on another piece of paper, then pointed to these four symbols and said: "Dongxue, this is the addition symbol, this is the subtraction symbol, this is the multiplication symbol." symbol, which is the division symbol."

"What's the use of this?" Dong Xue asked puzzled.

Wang Ping'an smiled and said, "Don't worry, I'll teach you right away, and you will soon know the magic of these numbers and symbols."

He once again wrote ten simple arithmetic problems on paper using addition, first two one-digit additions, then two two-digit additions, and then three-digit, four-digit and five-digit additions respectively. Two ways.

After Wang Pingan finished writing, he said: "Dongxue, now you do these ten questions, use the method you have learned before, and see how much time it takes, and then use the method taught by this young master to see what is needed. How much time."

Seeing these ten questions, Dong Xue was already eager to try. She didn't believe that what she had learned before was not as good as the planning method taught by Wang Ping'an and other clubs, which would save time.

She picked up the pen and began to count the questions on a piece of paper. Time passed by, and she finally finished all the answers. In order to make sure there were no mistakes, she did a check.

Although only half an hour had passed, Dongxue seemed to have passed a whole day, and the time passed very slowly.

Wang Pingan smiled and said: "You are done, then I will start to teach you, young master, while doing these ten questions."

He picked up the pen, and started to calculate the arithmetic problem with the vertical calculation method at the place where the one-digit number is added, and said: "Everyone adds up, and the answer can be written directly if it is less than ten, and if it is more than ten, write a small one on the left. It’s called advancing one to tens.”

Immediately afterwards, Wang Ping'an calculated and taught, and in less than 10 minutes, he completely calculated and verified the ten questions.

Dong Xue's eyes were straightened, she didn't expect Wang Ping'an's method to be so simple, she shouted excitedly like a little girl who got a new toy: "Master, this... this method is really fast, it's better than those who All the masters are going to be powerful, young master, you can form your own school."

After Wang Ping'an heard it, his face was neither red nor his heart beat, and he said cheekily: "This is taught by my teacher, Xiaoyaozi, and I have only learned a little bit. If I want to call it a master, I am not qualified."

"This is not enough, so how can it be considered enough?" Dong Xue couldn't help asking.

Wang Pingan stopped Dong Xue from continuing to ask questions, and said, "Don't think that you won't get anything out of these things. After teaching addition, teach subtraction." He didn't want to be questioned, and then reveal the secret that he was not a person of this era.

"Oh." Dongxue responded obediently.

Zhao Hao, who had been listening by the side, looked at Wang Ping'an with more respectful eyes. He didn't expect Wang Ping'an to be so impartial and selfless, teaching Dong Xue how to use Arabic numerals.

Wang Ping'an continued to use the same method to explain the application of subtraction.Dongxue is also very serious about snow, and he learned it quickly.

"Very good. Now you have learned addition and subtraction, and you are also proficient in counting numbers. Now I will teach you multiplication. Before that, there is a multiplication formula that you need to memorize." Wang Pingan said.

"it is good."

Immediately afterwards, Wang Pingan wrote out the ninety-nine multiplication formula, and said while writing. Dong Xue listened very carefully and memorized it carefully.

After half an hour of reciting Dong Xue to memorize the formula, and then recite it again in front of Wang Ping'an to pass the test.

"Very good. Remember these multiplication formulas. They will be of great use in the future. Zhao Hao, you can also learn them when the time comes. This will be very widely used in food and grass in the future." Wang Pingban reminded.

"Yes." Dongxue Zhao Hao replied at the same time.

"Actually, this multiplication formula is to use the same numbers to add together, and finally get a simple calculation method. For example, four nines 36, this is the result of adding four nines to get 36. You can find a few at random, and then add them up to see See if it's the same." Wang Pingan said.

Dongxue picked up a pen and wrote five additions on paper in disbelief, but the result was the same formula, which made her more sure that the Arabic numerals taught by Wang Ping'an were extensive and profound.

Wang Pingan smiled and said, "Now that it's confirmed, I'll start teaching you how to use multiplication, which is actually similar to the algorithm of addition."

He still wrote while explaining, using the simplest method to let Dongxue know, let her master it faster, and then he can teach them.

After another half an hour of teaching and practice, Dongxue finally mastered the multiplication method, and then spent another hour of arithmetic to learn the division method as well.

Wang Pingan looked at Dongxue with satisfaction and said, "Dongxue is indeed a talented woman. I just explained it a few times, and you will be able to apply it freely. But don't be proud, it takes more practice to know the result when you encounter a few numbers." Degree."

Dong Xue, who was a little bit proud at first, immediately said solemnly after being told by Wang Pingan: "Don't worry, young master, Dong Xue will meet."

"Well, now I'm teaching you how to use these numbers to keep accounts." Wang Pingan took out a blank notebook, picked up a brush, and began to draw a table on the notebook.

What he drew is the most basic accounting form for later generations. The first column in the first row is the date, the second column is the name of the person, the third column is the working time, and the fourth column is the working time. The wages are written in the fifth frame, and the remarks are written in the sixth frame.

Wang Pingan handed the form to Dongxue, and said, "Dongxue, this is a personnel form I designed. From now on, all the information in the commercial plaza must be made into a plan in this form, so that we can record it conveniently. Search."

"For example, you can design a purchase form." Wang Pingan pointed to the form and continued: "There can be many purchase forms. For example, write the serial number here, write the date here, write the name of the goods purchased here, and write the price of the purchase here. The price that can be sold here, the name of the person responsible for the purchase, the name of the store where the purchase is made, etc., the more detailed the better." Wang Pingan said eloquently.

(End of this chapter)