When Li Zong became serious, he no longer cared about Su Ying'er.

And the more you write, the more you feel unsatisfactory.

When he raised his head again, it was already dusk before he knew it.

Even for lunch, he took a few bites and dealt with it casually. It was really forgot to eat and sleep.

And when he finally realized that it was not early, he raised his head and looked at the setting sun, his eyes narrowed slightly.

On the edge of the table and on the ground, there were already things he wrote.

Because the ink marks were not dry when I just finished writing, it was not suitable to stack them together immediately.

Unexpectedly, because of this, he looked a little scary now.

Xiaoqing was also shocked when he saw his selfless appearance.

This is not a book, it’s crazy.

And how can one write so many things a day alone?

It’s not once or twice to let Xiaoqing come over and add paper.

Even, I just put in a batch of paper not long ago, but I didn’t expect it to be so unwritten.

"Husband?"

Su Ying'er was really shocked by him.

After all, if Li Zong hadn't really learned in his stomach.

There are so many things that you can never write.

She originally thought that her husband was really just a martial artist, but now it seems that it is not the case, although the content of his book is really unpopular.

"Ah, I accidentally wrote until dusk, and I wrote so much. The food was cold..."

After moving his already stiff waist, Li Zong continued: "It seems that I can't write so much at once next time."

Then he looked at Su Ying'er.

"One of the time, my waist can't bear it. Secondly, I just neglected Ying'er after less than seven days of marriage."

These words made the other party blush.

Xiaoqing, who was standing beside him, also called out, he didn't hear anything.

Then when he turned around and was about to find a place to get in, he almost hit the pillar without paying attention.

"What are you talking about, husband, you can see Xiao Qing..."

"It's okay, just apply some medicine when you hit me. I'm a little hungry. Have the meal been ready?"

Then, the two of them packed up all the paper on the ground, but because they didn't know if they would mix things up, Su Ying'er also asked in advance whether it would be too messy to just stack them together like this.

Li Zong said: "It's okay, I have marked the page number, and no matter how messy it is, it can be easily re-arranged."

...

night.

Candlelight supper.

This was the first time he felt the strong sense of responsibility as the head of the family.

In the past, my mother was there, and it seemed that she could still treat herself as a child, but now, it seems that everything in the family needs to be listened to.

Even though he eats, he doesn't speak or sleeps.

However, not long after, Su Ying'er said, "Husband, the paper at home has been used up. Do you want to go out to purchase it? And how much do you want to purchase?"

The two of them adopted a separate meal system, each with a snack table.

When Li Zong heard Su Ying'er's words, he turned his head and replied: "This paper is a bit unwritten and it is too expensive. I originally thought about publishing a book, but now it's almost the same as being able to write one by one by one. The conditions are a bit hard."

Although Li Zong has a beautiful wife now, the conditions in this era are ridiculously poor.

Even for a family like him, there is a lot of land left behind in the past. There is also a father who is an official in the court and has a fixed monthly salary, but it is just a little fuller than others.

Of course! Actually, it’s okay not to eat that well.

After all, I was used to eating big fish and meat in later generations, and sometimes I tried to eat lighter.

I thought about the gap.

Then he said, "Don't worry, I'll take you out to play tomorrow. Anyway, there's a lot of content I've written today."

Li Zong did not lie about this.

He has probably written from integers within 10 to infinite size, and has also proposed the concepts of fractions, decimals, percentages and even negative numbers.

Moreover, basic examples have been written on how to add, subtract, multiply and divide these numbers.

And this is basically the majority of the content of primary school.

Primary school students may need years of study, but Li Zong has to consider the readership of this book.

Therefore, his writing should be relatively more refined and concise.

When this part about ‘knowing numbers’ and ‘knowing operator symbols’ end.

Next, naturally, the vertical calculation method is.

There is only horizontal pattern in front, and the answer is given directly.

For example, 2347=70.

However, how did this 70 come about, or what are the benefits of learning this system?

Next...

Even the calculation method is difficult to match.

In fact, the calculation of the calculation is not bad, especially when calculating some relatively simple and small numbers, it can even be said to be better than this mathematical system.

Because of Li Zong's mathematical system, you must first learn ten basic numbers.

When it comes to calculating the foundation, you only need to know that a horizontal stick represents one, a vertical stick represents five, or the other way around, it is enough.

Calculating the chip is like counting fingers. The basic addition and subtraction operations are better than Li Zong's mathematical system. However, if you reach a relatively advanced or larger number, even if you only calculate multiplication within two digits, Li Zong's will have more advantages.

and……

There is one thing that Li Zong’s method that can never be compared with the calculation method.

That is a mistake.

Once the calculation sheet is moved, it will be difficult to perform repeated verification if it is wrong. Moreover, when the number is large, it is easy to cause confusion. Li Zong's method can eliminate these problems and can perform repeated verification at every step.

Now there is Tian Guang fifteen steps, from sixteen steps. Ask what is the field?

15×16=240 (square steps).

Next, a vertical formula is listed.

How clear and easy to understand.

What a beautiful mathematics.

However, Li Zong is actually more accustomed to saying broadness, length and width.

Therefore, his second step is to redefine these things, including rectangles, length, width, trapezoidal, upper bottom, lower bottom, high, and other concepts.

However, these are already elementary school geometry studies in mathematics.

After he finished writing most of the content he needed to learn in the sixth grade of elementary school, the ending here.

Li Zong also briefly listed the area calculation formulas for these geometric figures.

Among them, the formula of circles is included.

And, I would also briefly talk about why the area of ​​a rectangle is length by width. Here we need to understand how the surface comes from, jogs and lines move into lines, and surfaces move into bodies.

He basically completed these things this day.

He hasn't thought about what he wants to write next yet.

However, if it is in order, it should also be an algebraic formula.

But at this time he had not thought about how to write an algebraic formula, or...
Chapter completed!