"How does the girl count?" Shopkeeper Fu was very curious.

And all the people looked over.

Tang Xi smiled, "I'll tell you later." ”

She looked at Wang Yuanwai and said, "Can I lose this money?" ”

"Compensation, this is compensation!" Wang Yuanwai looked impressed, hurriedly untied his purse, took out a stack of silver tickets and respectfully presented it.

Tang Xi took the silver ticket and counted it, saw a lot, and had three hundred taels more, and hooked his lips with satisfaction.

"Uncle."

Tang Xi handed the silver ticket to Mo Yang, and after Mo Yang took it, he handed it to Mo Xu.

Mo Xu hurriedly put away the silver ticket properly.

He was very happy to take so much from Wang Yuanwai's hands at once.

"Is there anything else going on outside of Wang Yuan?" Seeing that the person was still there, Tang Xi couldn't help frowning slightly.

"Oh, Wang, let's go."

He was about to step out of the door, but he heard Xie Cheng say lightly: "Remember, stay away from the people of the Mo family in the future, otherwise, I will make your Wang Yuanwai become a wasteland, understand?" ”

Wang Yuanwai was shocked, and nodded again and again: "Wang remembers!" ”

With that, he went out and thoughtfully closed the door of the private room.

"Girl, you haven't said yet, how did you calculate such a large amount in such a short time?" Shopkeeper Fu was very curious.

Not to mention him, even Xie Cheng and Mo Yang and Mo Xu and others were very curious.

She raised her eyebrows slightly, "Multiplication formula, you haven't memorized it?" ”

She remembered that it was more than 2,000 years old, and they couldn't have known it.

Shopkeeper Fu said: "We know the multiplication formula, but how can we be as fast as you?" ”

"That's it." Tang Xi blinked, "For example, Fang Cai's one, ten taels a day, if it is calculated as a month and thirty days, it is three hundred taels a month, half a year is six months, six three hundred taels, that is one thousand eight hundred taels." ”

All:......

It sounds very simple, but how did she add such a large amount?

"Three hundred taels a month is enough, the amount is relatively small, but one thousand eight hundred taels, you can get the result without an abacus, how did you do it?" Shopkeeper Fu looked confused.

He felt that it was not his own problem that was wrong, but that the girl did not seem to know what he was asking.

They all know that there are thirty-sixty-eight, but how many zeros are added to these eighteen, how does she know?

"Oh, you mean, that's the problem." Tang Xi nodded suddenly, "Actually, it's very simple, after multiplying the two numbers, wouldn't it be good to add the zeros behind them?" For example, if ten is multiplied by thirty, and one is multiplied by three equals three, and then the zeros after them are added, and ten with a zero, and three with a zero, isn't that three hundred? ”

"Oh!" Shopkeeper Fu suddenly realized, "It turns out that it can still be counted like this!" ”

Tang Xi smiled: "I've always counted like this. ”

Mo Xu said: "That one thousand and ten multiplied by three, how can this zero be added?" ”

"One thousand and ten times three, that's one hundred and one zero times three, it's equal to three zero and three zero, that's three thousand and thirty."

"What kind of algorithm is one-zero-one-zero, three-zero-three-zero?"

Her calculation made everyone a little confused.

Tang Xi turned a corner, there was nothing in this ancient world, there was no one zero one zero, three zero three zero, she smiled, "I learned it from my master, and his old man gave me a number method called "Arabic numerals", and I used that to calculate. ”

"Arabic numerals?" Xie Cheng said with great interest when he heard this: "What is that number?" ”