In the Song Dynasty, there was no law or order.

"Today we will talk about basic mathematics. Have you learned the multiplication table?"

Early in the morning, after changing the medicine, Zhao Jun began to teach.

Now everyone's schedule has changed.

In the past, Zhao Jun got up at about four o'clock in the morning, Yan Shu came to deliver some food, and then Zhao Zhen and others came to watch for a while before going to court.

After the court, they came back to listen to Zhao Jun and Yan Shu chatting, and got a glimpse of the true face of history from the chat.

And at that time, Zhao Jun and Yan Shu did not dare to communicate too deeply, so the information they obtained was also scattered. Every day, they had to rely on Yan Shu to classify and summarize in order to have a clue, so the information they obtained was not much.

Now that the personnel of Nini Village have been built up, Zhao Jun has ten students. After the first class of the universe class, today he started formal teaching and took a math class.

In this way, Zhao Zhen and his men could go to the court first, deal with the affairs of the court, and wait for Zhao Jun to finish his lecture. Yan Shu would take him outside to bask in the sun, and the officials of the Song Dynasty could pretend to be the old, weak, sick and disabled who also came out to bask in the sun, and chat with him in the village.

However, now everyone is used to gathering in the back garden first, seeing Zhao Jun's situation before going to the morning court together, so when Zhao Jun started teaching, there were already dense crowds of people standing outside the door.

Everyone was watching.

Zhao Jun fumbled with the small wooden board, holding the charcoal pencil given by Yan Shu, and asked everyone if they had learned the multiplication table.

Elementary school mathematics is nothing more than addition, subtraction, multiplication and division. Negative numbers will only be encountered in the sixth grade. He was worried that the children here would have different learning progress, so he asked this question, which was not actually teaching, but testing the bottom line.

Then he heard a group of children below with a long childish voice: "No~~~."

"Okay."

Zhao Jun didn't expect the children's foundation to be so poor. They haven't even started to learn multiplication. I don't know what the previous volunteer teachers did. Did they only teach addition and subtraction?

"Then let's learn addition and subtraction today."

He fumbled on the wooden board, wrote one plus one with charcoal, and then pointed to it and said, "Who knows what one plus one equals."

"Two!"

The children shouted.

It seems that addition and subtraction still have some basics.

Zhao Jun thought to himself.

"Then does anyone know what three plus seven equals?"

He asked again.

No one answered quickly this time. The children counted on their fingers, and after a while someone said, "Ten!"

They don't know how to round up.

Zhao Jun roughly knew the level of the children, so he wrote down several series such as one plus nine, two plus eight, three plus seven, four plus six, and five plus five on the blackboard, and said to everyone, "Then let's learn how to round up today."

In daily life, addition and subtraction are generally only used for numbers below five digits. For more, a calculator is used, and many people even use a calculator directly for numbers above two digits.

But elementary school mathematics should still be taught. The so-called rounding algorithm is naturally a calculation method that can round up the single digits first.

Zhao Jun wrote 1+6+9 on the blackboard and told everyone how to calculate this series.

Simply put, first calculate 1+9 equals 10, then add 6 equals 16.

However, even with such simple arithmetic, the children still had a lot of confusion and it took them a long time to learn it.

After that, Zhao Jun taught several other types of arithmetic. He was busy for a whole class and his blood pressure was almost rising.

There are two difficulties now.

First, the children have different abilities and understand faster and slower. He has to take care of the slower children and teach them over and over again.

Second, he is blind and writes by groping. Sometimes he often draws wrong and has to erase and rewrite. It often takes him several minutes to get a knowledge point done, which makes him physically and mentally exhausted.

No wonder it is said that teachers who teach mathematics are prone to hair loss. Fortunately, he is a Chinese teacher.

After class, Zhao Jun lay on the bed to rest, feeling lucky.

This time he was assigned to teach in Daliangshan because the previous batch of teachers had left and the next batch of teachers had not yet arrived. The organization asked him to go to the outpost first to arrange the students, and then send new teachers in batches.

Teaching in remote areas is like this. There are no fixed teachers. There are even many teachers who are excited when they first come, but they complain after a few days, and then give up halfway and run away secretly.

If it weren't for the fact that he wanted to complete the two-year teaching quota, and the organization would give him many preferential treatments after passing the examination and the examination in the future, Zhao Jun would not want to suffer this hardship.

Now he is the only teacher in the whole school, and he is blind. This teaching task is very arduous.

For the time being, he can only teach each subject slowly. I hope that the road to the mountain will be opened as soon as possible, so that I can go down the mountain to the hospital for treatment as soon as possible, and the new teacher will come as soon as possible to share the pressure for me.

Zhao Jun thought to himself.

Just when he had just finished a class, Zhao Zhen and others turned around and walked towards the front palace.

At this time, it was about ten minutes past the time for court.

In fact, they would be late in the past, but today they originally planned not to be late, just look at Zhao Jun's door and go to court immediately, but they listened to a class and delayed the time for court.

But no one paid attention. The sky was still dark, and there was a faint gray light in the east outside the distant city wall.

On the double-story road outside the Qingshou Palace, the outer guards surrounded it, and then the eunuchs and palace maids led the way with lanterns.

Zhao Zhen and several prime ministers did not sit in the sedan chair, but just walked.

He walked and said: "Zhao Jun once said that the strength of the country in the future depends on the power of science and technology, and mathematics is the foundation of science and technology. After listening to this class today, it seems that it is nothing. It is very simple arithmetic. Didn't the arithmetic books left in the Qin and Han dynasties?"

"Your Majesty, I think the mathematics taught by Zhao Jun today is probably only a very small part of it. Otherwise, since there were books in the Qin and Han dynasties, why didn't the Qin and Han dynasties have science and technology? Obviously, just like the water in the ocean, simple arithmetic is just a drop in it."

Lü Yijian persuaded tirelessly.

"Your Majesty, you are right."

Zhao Zhen listened to the advice.

Wang Zeng also said: "I think the clever thing is not the simplicity of arithmetic, but its method. For example, the numbers in the arithmetic of later generations are no longer 1234567890, nor are they lowercase numbers, but are replaced with Dashi characters. Is this conducive to writing? Perhaps this is why Dashi characters are popular in later generations."

"Hmm"

Zhao Zhen pondered and nodded: "Does Wang Xiang mean to promote it nationwide?"

"It is indeed conducive to writing, but several of the numbers are easy to erase, which is a hidden danger, so there is no rush, let's wait and see."

Wang Zeng said: "I think it has another wonderful thing, which is to train people 's thinking ability, using the method of rounding to quickly get the arithmetic answer, who can think of this? "

"This should be the mathematical logical thinking that Zhao Jun just mentioned."

Song Shou said: "Mathematics can exercise people's brain power and increase intelligence. Perhaps it is because of learning mathematics that we can study other science and technology."

"Yes."

Wang Sui said: "We are getting older and older, and our brains can't turn around. It's still these young people who can think about things. Maybe we can ask Zhao Jun for advice on mathematics later."

The group quickly arrived at the Chuigong Hall along the Fudao and prepared for today's morning court.