"Alright, alright. Don't talk about missing out as if it's bigger than the sky. Besides, didn't I also fail to go to a key high school? Shu Shengtian comforted.

"You're different! You can be admitted......" But before Hao Guangyin finished speaking, he was interrupted by Shu Shengtian's words: "You have to get it, forget it, I'll teach you." To entangle such sentimental things again, we must hold a memorial conference. Shu Shengtian said like a precipice.

I saw Shu Shengtian shrug his shoulders, straighten his waist, drank a sip of mineral water, moistened his throat, and explained unhurriedly: "Actually, the so-called mental arithmetic and quick calculation are just a calculation method. The nature of the other operations is the same. ”

"I don't think so, I think you're going to be fast!" Hao Guangyin's eyes flashed and he answered.

"Eh, don't be too deified with mental arithmetic. It's really just a method, and you learn it. However, the first thing is to be open to it, to accept it, to use it, to get used to it, and when you get used to it, you can easily control it. Shu Shengtian looked at Hao Guangyin as he spoke, and saw that he seemed to understand but did not understand. Shu Shengtian raised his voice and continued: "I'll give you an example first, what is three times nine?" ”

"Twenty-seven? Who wouldn't? Hao Guangyin replied.

"Okay, let me ask you, why twenty-seven?" Shu Shengtian asked.

"Of course it's twenty-seven, isn't it?" Hao Guangyin asked puzzled.

"Well, you've misunderstood me. You see, isn't this the case, since we were young we have been learning the "Ninety-Nine Multiplication Table". I memorized the mantra day after day, so when I was asked, I didn't need to think about it, and just said the result of twenty-seven? Shu Shengtian asked.

"yes, yes, I really didn't have what I said!" Hao Guangyin said quickly.

"That's right. But, you know what? Foreigners don't know what a ninety-nine multiplication table is! Shu Shengtian said.

"Huh? And people who don't know about this thing? So how do they calculate? Hao Guangyin actually became interested in this topic.

"Use a calculator. They are instilled with this idea of using tools to solve problems from an early age. So, you're in vain why the first generation of mobile phones had the calculator as an ancillary feature, right? Speaking of which, Shu Shengtian actually has a hint of arrogance.

"I'll let me go, it's really better to listen to your words, than to read a book for ten years! Knowledge! Knowledge! Hao Guangyin said loudly.

"Even if it is oral arithmetic, the logic in their hearts is 'one nine less one, three nine less three, three ten less three, equal to twenty-seven'." Shu Shengtian added.

"What? That's too slow, right? This makes Hao Guangyin really hard to believe.

"Actually, it's not that slow! The reason is that this is how they think about logical thinking since childhood. Over time, habits of thought are formed. Just like when the computer inputs, some people use the five-stroke input method, and some people use the pinyin method. Over time, even if there is a difference in input speed, there is not much difference. Shu Shengtian said.

"Speaking of which, you're pale, aren't you? For the product of numbers, even if it is multiplication and division of multi-digit numbers, addition and subtraction, some people use pen column calculations, some people take out their mobile phones and use calculators to calculate, and some people use their hands to direct dance mental arithmetic, in fact, they are essentially the same thing. It's just that the method is different from the habit. Don't be overly favoritistic. Brother Hao, I can teach you a finger operation thinking today, it's very simple, just open a small window in your thinking, you can feel it. As he spoke, Shu Shengtian tilted his head and looked at Hao Guangyin, who had been envious of mental arithmetic for a long time, and his eyes were full of light.

"Great, my brother Shengtian. Can I learn it? Hao Guangyin couldn't believe that he had really entered the learning process so quickly.

"Rest assured, this is the foundation of the foundation, so easy! Stretch out your two hands, lay them flat in front of your eyes, and stare at them. Count from left to right, 1.2.3.4.5 (left-handed), 6.7.8.9.10 (right-handed). Right? After speaking, Shu Shengtian stopped and waited for Hao Guangyin.

"Yes, yes!" Hao Guangyin echoed.

"Each hand is numbered, right? Follow me as you go! A few times nine, a few times nine, whoever multiplies who bows his head! Then you bend the number of your fingers corresponding to the bowed head. Then read out the number of fingers stretched out on its left and right sides. It's as simple as that, you try! Shu Shengtian explained as he did it.

"It's as simple as that? Are you sure? It's as simple as that, easy to use? How can it be! I'll give it a try! A few times nine, a few times nine, eight times nine, eight by nine, eight bowed, and then the left and right parts, seven...... Two! Holy, so amazing? Hao Guangyin couldn't believe it, the seventy-two represented by his finger actually jumped in front of him, no, it jumped in his hand.

"Brother Hao, Brother Hao. Don't look at palmistry here! The last group event is coming soon, jumping rope. The success or failure of this is directly related to whether our class is the first in the overall score! What's the strategy for a sure win? Tang Hongcan's sudden visit interrupted Hao Guangyin's learning process.

"Well, I'...... I haven't figured it out yet. Hao Guangyin said with a slight embarrassment.

"Brother Hao, I've got you covered. Use a Möbius watch! Do you think, as long as someone makes a mistake, jumps, and delays time, you can use the replay, let him start over alone, and give him another chance, isn't it? You said before that you couldn't bear to use it on those opponents who were classmates, but now it's okay to use it on our own people, right? Tang Hongcan said happily.

"Well, that's what I said, but we're cheating, right?" Hao Guangyin asked timidly.

"What's wrong with us just improving our own results and not destroying other people's results? Second brother, second brother, you are giving a comment, am I not right? Tang Hongcan said angrily as he reached out to pull the book Shengtian.

"I think...... Let's go, what Brother Hao said is right...... "Shu Shengtian's words, the voice was not loud, Hao Guangyin beside him heard it, but Tang Hongcan, who was still angry, did not hear it.

"Everyone, pay attention, let's listen, the last project is the 'group rope'. Because the number of participants is relatively large, I will click on the name, the people present raise their hands, and the others also look at each other, if there are those who go to the bathroom and do not come back, check each other and remind each other. If everyone is together, let's go to the competition field to check in. Hao Guangyin...... Book wins the sky...... Tang Hongcan ...... "Lu Chuan will count the number of people.