I am a primitive

There are various texts, long and short, which already existed before, plus those adapted by Han Cheng, and those written by himself. There are a total of 64 texts in total.

So many texts, revised into a book, are enough for these children in the tribe to learn for a while.

After finalizing these texts and writing about after-school activities and other things later, Han Chengcheng put the matter aside, called Stone and Wu over, and asked them to complete the follow-up tasks.

The main thing is to sort the texts according to the principle of easy to difficult, and then find new words that have not been learned from the following texts, select them specially, mark them, and list them as key learning objects.

At the same time, you can also imitate Han Cheng's previous model, according to the content of the text, and ask enlightening questions later.

After doing all these things well, the rest is to transcribe the draft version of the text onto the blank textbook.

The textbook, when Han Cheng was writing the text, had already been made by someone, that is, the paper was cut to a length of 25 centimeters and width of [-] centimeters, and then bound.

If there is no staple, let the people in the tribe first pierce the hole with a leather awl and put it on with a leather rope.

Worried that it was not strong enough just like this, I glued it there again.

There are no printers or printing machines in the tribe, so textbooks and other things can only be transcribed by hand.

Han Cheng has thought about printing, but it is not something that can be done overnight if he wants to get it out of nothing.

It takes a lot of time and energy to get it out after repeated experiments, revisions, and adjustments.

And the teaching in the tribe is an ongoing matter, and textbooks need to be produced as soon as possible and put into use.

Therefore, Han Cheng didn't put much effort into printing for the time being. He wanted to use a stupid method to create a batch of textbooks for use first. After he was in a hurry, he began to let people slowly learn this technology.

Fortunately, the population in the tribe is not that large, and it is not impossible for two or three people to use a book temporarily.

Moreover, if printing is used, the paper that can be produced in the tribe at present may not meet the requirements and cannot be printed, and the paper also needs to be improved.

These are things that need to be overcome, not to say, just get a carrot and carve a chapter, dip some ink in it, and poke it on the paper.

It's not that simple.

If it were really that simple, people from Europe would not call it one of the four great inventions.

After the matter of the Chinese textbook was roughly settled, Wu and Shitou would handle the rest of the details and copy them onto the blank textbook. Han Chengcheng began to prepare the math textbook intensively again.

In view of the fact that the people of the tribe are quicker to accept addition and subtraction, when it comes to multiplication and division, it will be a big headache, Han Chengcheng directly put 1x1=1 1x2=2... on the first page, the ninety-nine multiplication table, according to The order is written down from high to low.

This inspiration came from the pencil case I used as a child.

At that time, as long as the pencil case was opened, you could see the nine-nine multiplication table printed on it.

At that time, Han Cheng was able to write it down, thanks to the pencil case.

As long as there are enough indiscriminate bombings, there will always be a time to write them down.

And as long as you write down the ninety-nine multiplication table, it will be easier to perform simple multiplication and division, and you have a foundation.

After writing the ninety-nine multiplication table at the beginning, Han Chengcheng began to write the numbers from 1 to 10.

In order to make it easier for the children in the tribe to memorize, Han Cheng also brought over the nursery rhyme-like jingles he learned when he was a child—1 is like writing and drawing with a pencil, 2 is like quacking a duckling, 3 is like hearing sounds with ears, 4 Like a small flag hula la, 5 like a scale hook to weigh things, 6 like a spoon hanging on the wall...

At the same time, I also used the skills of a soul painter to try to paint the corresponding things as similar as possible under the several numbers.

As for 0, Han Cheng drew an egg underneath.

After writing out the numbers, Han Chengcheng began to work hard to compile the book.

Xiao Ming from Class [-], Grade [-], and Xiao Hong and Xiao Fang all appeared.

The questions given are very simple, and the example questions are described first, and then some questions similar to the example questions are given later, so that the students in the tribe can imitate the example questions to calculate these questions.

A little more imitation will do.

For example, he wrote in the first sample question——Xiao Ming has three lollipops, and the Son of God rewarded him with another lollipop. How many lollipops does Xiao Ming have in total now?

Then explain it below, and finally list the formula of 3+1=4.

The subsequent subtraction is basically modeled after the previous addition.

For example, Xiao Ming has three lollipops, he ate one, how many lollipops are there now?

Of course, in addition to lollipops, there are also arithmetic problems such as dividing fruit and fish.

At the beginning, it was all addition and subtraction within ten, and later it will gradually develop to within one hundred.

And it is no longer simply how much plus how much, how much minus how many, but has developed into how much plus how much plus how much equals how much, how much minus how much plus how much equals how much.

As the numbers to be calculated became larger and the number of addition and subtraction operations increased and became more complicated, Han Cheng wrote the addition and subtraction expressions in a timely manner.

Just like when learning simple addition and subtraction before, I also learn the addition formula first, and after learning a certain number of addition examples and using them more proficiently, I start to write the subtraction formula for people to learn.

Later, the number of addition and subtraction will be expanded to thousands, ten thousand, and one hundred thousand.

As long as you can master the addition and subtraction formulas proficiently, these are not a problem.

After adding and subtracting, there is multiplication and division. Like addition and subtraction, you start learning from simple multiplication, first learn multiplication, and then learn division.

Xiao Ming, Xiao Hong, Xiao Fang and some other hated children reappeared again, each with a lollipop or something like a puzzle to others, especially for the children in the tribe.

When it came to division, Han Chengcheng figured out the remainder.

At this time, the remainder is actually the most in line with the actual situation of the tribe.

After all, many things cannot be divided into several parts.

Of course, this is only the initial stage. After gradually deepening, decimals will appear.

After writing multiplication and division, Han Cheng mixed the four operations of addition, subtraction, multiplication and division together.

Multiply and divide first, then add and subtract, and if there are parentheses, calculate those inside the parentheses first, etc. These arithmetic rules were also moved by Han Cheng.

Unlike Chinese, mathematics cannot be edited randomly. The topics can be edited according to the times, but the calculation rules cannot be changed. At least Han Cheng himself does not have the ability to change it.

At the same time, he also wrote out the calculation rules such as (a+b)xc=ac+bc, and also used them to explain with examples, so that people in the tribe can understand them more easily.

Of course, this is considered to be more advanced mathematics knowledge.

In the first volume of mathematics books, I have learned the four arithmetic operations, and that is the end of it.

In the second volume, Han Cheng plans to build on the basis of the first volume and figure out geometry, such as calculating the area and perimeter of triangles, squares, trapezoids, and circles.

Later, we will learn the volume of three-dimensional figures, as well as surface area and so on.

Of course, Han Cheng didn't start writing the second volume of mathematics books immediately, but stopped there.