Accountant of Tang Dynasty, starting to liquidate the family property.

Someone yelled, and everyone sat down, leaving only screams like slaughtering pigs.

At this time, I saw a gentleman walking in with a bag.……

"what happened?"

"It was me, sir." Changsun Fei'er was stubborn. She explained the matter clearly in a few words, and the classmates next to her also came to testify.

The husband sighed:"Go back and bandage it. Next time, your father will break your legs. After saying that, he glanced at Qin Song:"Are you feeling better?" Qin Song stood up and said,"

Yes, sir, I'm worried.""

"The good years are ahead, and the days of long-term love between children are ahead. Studying with peace of mind is the foundation. It's not easy for your father to send you here. He didn't ask you to fish for a jade pendant in the water."

Qin Song nodded quickly:"Thank you sir for your teaching." His first impression of this gentleman was not bad.

The gentleman picked up the iron ball and said:"Recently, I saw an exercise question in the"Nine Chapters of Arithmetic" written by my ancestors. Today Let me test you."

Qin Song was a little surprised, oh, this person is a descendant of Liu Hui. No wonder he teaches arithmetic

"Please give me a question, sir. The gentleman paced back and forth and said,"There is a pond now, one foot in diameter, with a jiaocheng growing in the center, and a foot of water flowing out." Lead Jia to the shore. If it is level with the shore, ask about the depth of the water?"

After listening to this, Qin Song thought to himself, well, as long as it has anything to do with mathematics, it's all these brain-burning things. It's either meeting or letting go. Now that we're here, we still have to study how deep the water is?

This kind of algorithm will naturally not be a problem for Qin Song. , he could calculate it by opening his mouth, but he didn't dare to say it, because he found that many people were starting to stir up the iron ball. Some people could get the iron ball in their hands very fast, like Changsun Fei'er, who was even more confident. He put the ball into the plate.

He looked at Du Yong again. After a while, he was sweating profusely. He looked back at Qin Song, smiled, and started playing with the iron ball again.

Only Qin Song stared at the iron ball and The wooden plate was silent. How to use this thing? What is this?

This kind of question is the Pythagorean theorem. Qin Song knew the result as soon as he thought about it, 3.75 feet.

But how to calculate it? Which of the iron balls counts as one? How? Did you get 3.7?

Looking around, many people were taking the ball and putting it in, taking it out, and putting it in again...

Qin Song felt that he was going crazy with this puzzle game.

I wanted to go home and find it. Mom, I don’t want to play with them anymore……

"Qin Song? Why not?"

Qin Song stood up quickly and looked around:"Sir, students, students seem to have forgotten……"

"Forgot something? Topic? I can read it again"

"Sir, the student has forgotten what this iron ball is for. Won't use it anymore"

"What? What did you say? You can't keep track of the ball anymore?"After listening to this, sir, he seemed to be in disbelief. This is a basic operation in arithmetic. If you don't know how to do this, you are nothing."

Du Yong quickly stood up:"Sir, sir, maybe he fell into the water and burned his brain." If you forget the time, you can recall it just by thinking about it."After speaking, he tugged on Qin Song's sleeve.

"Oh, yes, yes, students will be able to use it after they study for two more days. Please don't be angry, sir."

Mr. Liu is a more responsible man. He looked at Qin Song and said:"What you have learned may not be arithmetic, but it is acceptable. In the future, you can do the accounting for the family, and you can also keep your share of the family business. If you forget it now, you won't be able to do it. It’s nothing, but don’t lose heart, just keep learning"

"Yes, thank you sir for your teaching.

Mr. Liu sighed:"Sit down." After saying that, he couldn't help but touched Qin Song's head:"What a good boy, why did you forget?" Do you still remember the calculation?"

Success? It's the name of those small wooden sticks. I seemed to have played with it when I was a child, but somehow I had forgotten it. Qin Song stood up again embarrassedly:"Success, the student has also forgotten it."

As soon as these words came out, there was a burst of laughter in the classroom.……

"Have you forgotten all the calculations and how to remember the ball? What else are you studying?……"

"Haha, go home quickly, don’t look back and forget about your home……"

"My eldest grandson, Feier, you will definitely be in charge of the family in the future. Haha, your husband-in-law almost forgot about you.……"

Qin Song naturally didn't care about others making fun of him. The key was that he felt embarrassed facing such a teacher.

As if he felt Qin Song's guilt, Mr. Liu sighed:"Then learn from the beginning. If it doesn't work, I'll teach you how to use the abacus as a teacher.""

"Abacus?"Qin Song thought, isn't this the predecessor of the abacus? It's unreasonable if he doesn't know how to do this thing anymore. He used the abacus to kill the masters all over the country instantly. The title of the young iron calculator is not for nothing. As long as he has an abacus, You can understand the principle at a glance, and you can always learn it if you take your time.

Thinking of this, Qin Song clapped his hands and said with a smile:"Yes, yes, the abacus is good, the abacus is good, sir, the student's abacus is quite solid."……"

As soon as these words came out, the teacher burst into laughter again.

Qin Song was stunned. What happened?

Mr. Liu gave a wry smile, patted his shoulder and said,"I know you are relieved, but I have never taught you abacus. After all, I am not very proficient in this thing.""

"ah? ? Haven’t taught it yet?"

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