"That's right, because there are nine rows and nine columns, so it's called the ninety-nine multiplication table, Xiaomi already has some basis for addition and subtraction, and it will definitely not be too difficult to learn this." McGonagall looked at the neatly arranged stepped multiplication table, neat horizontally and vertically, with clear handwriting, put down the pen with satisfaction, and said with a smile.

"And what's that little fork in the middle?" Amy asked, pointing to the 'x' in confusion.

"This is a multiplication sign, which means the same as multiplication, so it means a little more concise." McGonagall smiled and explained, letting Amy sit down in a chair next to her and pushing the multiplication table a little over, "What about this multiplication table, only my father will know me, I only need to memorize eighty-one items, and then learn the decimal system well, and I can solve most of the arithmetic that I need to use in life." ”

"Wow, my father is so good, last time Teacher Luna told Xiaomi to memorize the multiplication table, you need to memorize 1770 items, Xiaomi only memorized about 100." Amy looked at McGonagall with admiration, but she didn't expect that her father not only wrote beautifully, but also had a simpler arithmetic method than Teacher Luna, which was really amazing.

Although it is standing on the shoulders of the ancient Chinese sages, it is a little not good, but the feeling of being adored by her own girl like this really makes McGonagall feel too happy, and she smiled and pointed to the first item in the upper left corner and said: "Then let's learn the first column today, the numbers on both sides of this multiplication sign are multiplier signs, and the product behind them is the result of calculation......

McGonagall explained the composition of the multiplication table to Amy in detail, and Amy did have some mathematical foundation under the teaching of Teacher Luna, at least she understood the meaning of each number, and also had a certain concept of adding and subtracting numbers. However, there is no base system in mathematics in this world, so he spent a lot of time slowly getting Amy to understand the meaning of the base system.

Perhaps the most gratifying thing about McGonagall is that Amy has no doubts about everything he says, even if it completely subverts what Teacher Luna taught her, she chooses to listen to him unconditionally, and quickly accepts the concept of decimal multiplication.

"One by one, one by one, one by two, two by two......" Amy read along with McGonagall, the little girl's memory is not bad, she followed McGonagall more than a dozen times, and the first column was memorized.

McGonagall struck while the iron was hot and took her through the entire multiplication formula table twice, giving her a sense of the whole thing first.

"But father, what's the use of remembering this?" Amy read it to herself a few times, looked up at McGonagall in some confusion and asked.

"This is very useful." McGonagall smiled and pointed to the multiplication table, "You see, we now sell a Yangzhou fried rice for 600 copper coins, that is, 6 gold coins, just like Grandpa Mobai just ate four servings, that is, 4x6=24, directly know the result, no need to break your fingers to count one by one, you say it is not very convenient." ”

"It's really 24 gold coins!" Amy's eyes lit up suddenly, just now she added it in her heart to calculate the 2400 copper coins, but her father used this formula table to get it casually, this multiplication table is so easy to use, and he said enthusiastically: "Father, I want to learn, I want to learn this multiplication table!" If you learn well, Amy can really help her father. ”

"Okay, then let's learn three columns today, and the rest tomorrow." McGonagall smiled and nodded, the most important thing to learn is initiative and positivity, Amy has no shortage of both, I believe that she will soon be able to master the multiplication formula.

The noon hours passed in Amy's recitation of the multiplication formula, and no second guest entered the restaurant except for Mo Bai, which shows how deserted this corner of Aden Square is.

However, after selling four servings of fried rice, McGonagall felt a lot more at ease, at least she didn't have to worry that the taste of Yangzhou fried rice was not suitable for people in this world. And judging from Mo Bai's reaction, the effect of fried rice on relieving muscle fatigue is also effective for him, and maybe he will be a regular customer in the future, which is good news.

"Three-forty-two, three-fifty-five, three-six...... 36...... 36...... Thirty-six is too difficult......" Amy looked up at McGonagall with some grievance, this was the fifth time she couldn't carry it here, tears rolling in her eyes.

"Okay, then let's memorize it to thirty-fifty-five today, Xiaomi is already great, and it is rare for children to memorize the first column for the first time. Later tomorrow will be recited, step by step is the best. McGonagall reached out and put the multiplication table away, smiling and rubbing Amy's hair, which reminded him of the little video he had seen in his previous life of a little girl crying on the back of the multiplication table, sure enough, the same age, the same trouble.

"Really?" Amy, who had thought she was going to be reprimanded, heard McGonagall's words and her eyes lit up again, and her father actually said that she was better than the other children.

"Of course it's true, when did your father lie to you?" McGonagall looked into Amy's eyes and nodded earnestly.

"Well, my father won't lie to Xiaomi, then Xiaomi will definitely take care of it tomorrow." Amy nodded, and a bright smile appeared on her face, a little more confident.

McGonagall put the multiplication table behind the counter, which would be after the meal, and no one would come to eat, looking at Amy's somewhat messy hair, she simply walked to the door and flipped the open sign, locked the door from the inside, and then took Amy's little hand and said, "Let's go, father will help you wash your hair and bathe, and become a clean little fairy." ”

"Do you want to boil hot water and take the barrel first?" Amy asked, looking up at McGonagall.

"No, there is a pipe upstairs that comes out of the hot water directly, and there is a bathtub." McGonagall laughed and shook her head.

"Is it like a kitchen faucet?" Amy was amazed that the thing that her father called the faucet was so magical, as long as it turned around, clear and sweet water came out, just like magic.

"Well, yes." McGonagall nodded, and took her little hand upstairs, Amy's understanding of the world had only just begun, so she was only curious about the modern things at home, and she didn't have too many entanglements.

Amy, who saw the bathtub for the first time, quickly got used to it, sat in the bathtub with her feet fluttering, holding the white foam in her hands and giggling, looked at McGonagall and said happily: "Father, this bathtub is so fun, and these bubbles are so fragrant, they smell so good." ”

"Well, this is a shower gel for bathing, and now I have shampoo in my hand, which is used to wash my hair, and my hair will be very clean and fragrant after washing." McGonagall said with a smile, rubbing the shampoo into Amy's hair with her hands a little awkwardly, and said softly, "Close your eyes obediently, it will be very uncomfortable if the shampoo runs into your eyes." ”

"Well, millet is going to be as fragrant as my father." Amy obediently closed her eyes.

McGonagall gently rubbed Amy's hair, although a little clumsy, but it was better to be meticulous, carefully parting the hair that was stuck together, in fact, Amy's hair was still very soft.

Bathing and washing the hair of the child is indeed a technical job, anyway, after McGonagall helped the little guy wash his bath and hair, the clothes on his body were almost wet, but looking at the little guy wrapped in a bath towel and the little skirt that was worn aside, McGonagall was a little distressed again, and asked tentatively: "System, do you still sell clothes?" ”