Qi Lele quickly finished drawing a simple form, took a handkerchief and carefully wiped the cinders on the edge of the scale, and then began to fill in the form.

Xie Zi'an was on the side, leaned over slightly, and couldn't help but smile when he saw the small characters in his hand that were much more neat and beautiful than the brush.

But the smile paused when he saw the twisted lines behind him. Fun Cabinet

"What is this?"

"These are Arabic numerals, which are equivalent to the abbreviated zero, two, three, seven, eight, ninety, and ninety."

"So it's called Arabic numerals?"

Qi Lele looked surprised: "Have you seen this too?"

Xie Zi'an pondered for a moment and said, "I have indeed seen it, but I have seen it a few times by chance, but it is absolutely impossible to apply what I have learned like my wife."

Qi Lele was silent for a moment, and then asked Yoyo, "Is there anything else you don't know?"

Xie Zi'an smiled: "Madame's method of keeping accounts, I have never heard of it."

"It's a form, it's not just for bookkeeping, it's for keeping track of everything, and it's easy and easy to see at a glance." Qi Lele said, and explained the usage of the table in general.

Xie Zi'an was so smart that he quickly understood the essence: "It's really wonderful!"

"This bookkeeping is the most convenient, and every income and expenditure is clear."

Xie Zi'an nodded the numbers and asked, "Then how do you use these Arabic numerals?"

Qi Lele took a piece of rice paper and began a new round of teaching.

One of the two knew everything, and the other studied seriously, but before they knew it, it was late at night.

Xie Zi'an was amazed: "This method is indeed exquisite!"

Qi Lele laughed, "This is just addition, subtraction, multiplication and division, which is the most basic algorithm. Further back, there's more. These are collectively called mathematics, but they are actually arithmetic."

"It's arithmetic, but it's simpler and clearer than the calculations I've learned."

Xie Zi'an's gaze still fell on the rice paper, with various formulas on it, as well as a large number of vertical calculations, all of which he had never seen or heard of.

Qi Lele stayed by the side and couldn't help yawning.

Xie Zi'an came back to his senses and said, "It's late, let's go to bed first."

Qi Lele nodded, freshened up and lay down on the bed.

Xie Zi'an didn't feel sleepy, and his tone was a little hesitant: "This method ......."

"In another place, almost everyone knows it." Qi Lele turned over and said lazily, "Since I taught you, I don't plan to hide it. However, this is something you learned from the book yourself, and it has nothing to do with me!"

Xie Zi'an was stunned for a moment, then laughed, he turned sideways, took her into his arms, and said softly, "Sleep."

Qi Lele was so sleepy that he couldn't open his eyes, so he fell asleep in his arms.

Looking at her sleeping face, Xie Zi'an stayed awake all night, how long did this girl live alone in that place?

Could it be that what the book says is true, there is really a hole in this world, a thousand years in the world?

"New algorithms? It's easier than a calculation?"

Xie Zi'an nodded, and wrote down a string of numbers with a pen.

Xie Dai glanced at it: "Isn't this the way it is written in Buddhist scriptures?"

"These are Arabic numerals, which can be mathematically used, and they are similar to calculations, which are all decimal ones, but they are more convenient than calculations."

Xie Zi'an said, in front of Xie Dai, he used the vertical calculation method to calculate a few for Xie Dai to see.

If Qi Lele was here, I am afraid that she would be shocked again, because last night she taught Xie Zi'an a two-digit algorithm, and today Xie Zi'an demonstrated to Xie Dai a four-digit algorithm.

Halfway through the sight, Xie Dai sat up straight, obviously interested.

"The method of calculation is more than addition, subtraction, multiplication and division, it counts almost everything."

Xie Zi'an said: "Addition, subtraction, multiplication and division are only the introductory methods of mathematics."

Xie Dai raised his eyes to look at him, "This is also what that girl taught you?"

"I learned it myself from the book."

Xie Dai paused, then laughed: "Interesting! Interesting! Fathers are a little envious of your good fortune."

Xie Zi'an reminded, "My mother is next door."

Xie Dai smiled, "Stinky boy!"

"In addition, there is also a method of recording and co-ordinating, which is also simple and easy to understand."

"Oh?"

Xie Zi'an drew the table casually, horizontally and vertically, not much worse than what Qi Lele measured with a ruler.

After reading it, Xie Dai pondered for a moment and said, "It is indeed simple and clear, but this form must be matched with Arabic numerals to be more practical."

Xie Zi'an nodded: "If it can be popularized, it will be a good thing to think about it, but it is still a little difficult for ordinary people to plan after all."

Hearing this, Xie Dai's eyes showed a little relief: "According to your wishes."

Xie Zi'an looked at the hour: "I'll go back to the room first."

"Go ahead." Xie Dai said: "Marrying a wife is like a treasure, and it should be cherished."

"Remember my father's teachings."

Waiting for the people to walk away, Xie Dai looked down at the columns of vertical types, and after a while, he lifted the pen.

I slept too late last night, Qi Lele woke up, it was already dawn, she stretched lazily, and suddenly saw the figure in front of the desk out of the corner of her eye, and hurriedly withdrew her hands: "Don't you have to go to morning class today?"

"Daddy doesn't have time to teach me today."

"What?"

Xie Zi'an said, "I told you everything I learned last night, and my father should still be thinking about it now."

Qi Lele sounded the alarm bell in his heart, the one in front of him was already a top student, and the father who was admitted to the Jinshi must be not far behind, she had to quickly find time to go into the space to read the math textbook, otherwise wouldn't it be a shame to be asked back?

After Mali's grooming and breakfast, Qi Lele first went to the room to look at the silkworm seeds, but there was still no movement. She turned and went out, intending to go around the field to see the seedlings of the cottonseeds, and then see what was going on with the rice seeds that had been transplanted into the nursery fields.

Seeing Xie Zi'an by his side, Qi Lele couldn't help but say, "If you have something to do, you don't have to stay with me all the time, I'm not a three-year-old child."

Xie Zi'an smiled: "I thought about it for too long last night, and my brain is a little chaotic at this time, so it's okay to go around with you."

Oh, and it's typical of overuse of the brain.

As soon as he arrived at the cotton field, Qi Baojiang greeted him with a smile: "Your method is so good! I don't even have to replant this year."

Qi Lele smiled and asked, "How are the seedlings that Uncle Qi transplanted into the seedling field growing?"

"Okay! They're basically alive, and now I'm waiting for them to grow a few leaves and move them to the paddy fields!"

"That's good."

Qi Baojiang said with a smile: "Brother Chang told me, you want chickens, this matter will be wrapped up in me, when the weather is warmer, I will give you some hugs, don't mention the silver to me again!" Isn't that burying me!"

"One yard to one yard, we don't want it, we have to ask for a lot, you don't want money, how can we be embarrassed to ask for it?"

"Isn't that the egg-like thing! You've saved me a lot of rice seeds alone!" Qi Baojiang said, "That's it."

Qi Lele couldn't help but look at Xie Zi'an, Xie Zi'an smiled and said, "Then it's better to be respectful than to obey your fate, thank you Uncle Qi."

Qi Baojiang was satisfied: "That's right!"

Taking advantage of Xie Zi'an's efforts to talk to Qi Baojiang, Qi Lele went to the seedling field to take a look, the seedlings were growing well, and he could see that the density of the buds was indeed gratifying, and sure enough, the spring water in her space was enough to nourish her.

When she went to the seedling field of rice seeds, Qi Lele poured some spring water into it by watering, and she also pondered that she would try rice hybridization again, and she had to ensure that these rice grew well.