Zhao Longji's incomprehension did not affect Xiang Yan's enthusiasm for speaking.

Xiang Yan then wrote a "two" under "one" and a "2" under "1".

Write a "three" below "two" and a "3" under "two".

……

Finally, write "zero" below "Jiu" and "0" below "9".

The Arabic numerals were completely displayed in front of Zhao Longji.

From one two and three Wu Lu Qi Jiu to 123456789, it seems to be more concise.

Zhao Longji looked at the paper spread out in front of him thoughtfully.

Xiang Yan smiled:

"Now it's time to uncover the truth."

I saw Xiang Yan write on a piece of paper:

On the 25th of March, he received 1,782 taels of silver, at a cost of 954 taels, and made a profit of 882 taels.

Then write a sentence on the next line that exactly follows the previous message.

On March 25, 1,782 taels of money were collected, the cost was 954 taels, and the profit was 828 taels.

"This, this, this ......"

Zhao Longji looked at the two lines of words on the paper and was stunned, the first line of words was dizzy to keep accounts with uppercase numbers, which invisibly added a lot of difficulty to the audit.

The second line of words is concise and focused, and the key information can be distilled at a glance, saving a lot of energy.

The imperial court has so many accounts to check every year, if these symbols written by Xiang Yan are introduced, what kind of terrifying improvement will it be to the work efficiency of the government?

I didn't expect that the slight improvement in the simplicity between the small "one" and "1" would be able to bring about this terrifying accumulation of qualitative changes after the introduction of the ledger system!

Seeing that Zhao Longji's interest was finally aroused, Xiang Yan struck while the iron was hot.

"I still have something good to say, Your Majesty, please see!"

Xiang Yan continued to write on the paper as she spoke:

The total profit for today and yesterday is 1,853 taels plus 1,742 taels, making 3,595 taels.

Then replace this sentence with Arabic numerals below.

now

The total profit of yesterday two days, 1853 + 1742 = 3595 (two).

"This! This! This! ”

Zhao Longji pointed to the paper and was so excited that he couldn't speak, and when it came to the field of computing, the complexity of the three lines of words could be reduced to the level of a whole line of words!

Is this an efficiency boost for all sorts of horrors?

Xiang Yan made persistent efforts:

"Your Majesty, from the first line of words, can you judge the right or wrong result of the final result of three thousand five hundred and ninety-five taels from the first line of words, one thousand eight hundred and fifty-three taels and one thousand seven hundred and forty-two, without using an abacus?"

"Obviously it can't be."

"But if it is the formula 1853 + 1742 = 3595, as long as it is learned systematically, even a ten-year-old child can quickly judge it right or wrong in a second or two, without using any tools!"

Zhao Longji was stunned for a moment.

His mind was chaotic, obviously he couldn't absorb everything Xiang Yan said at once.

But he could still intuitively feel what kind of terrifying thing Xiang Yan was talking about.

It's no longer a matter of doubling or two.

It's as if you've reached another realm.

Although the essence is still talking about settling accounts.

But it's clearly not in the same world anymore!

What does this feel like?

It's as if the first train was crushed by a horse-drawn carriage in various performances, but only those who really know the goods can know it.

What kind of gap does there exist?

Such a gap has even reached the point that people in the future will no longer compare horse-drawn carriages and trains together!

Xiang Yan continued to add firewood:

"Find me a book of accounts that have been calculated by the palace with errors."

Wang Fuguo obeyed the order and found the account book according to Xiang Yan's request.

Xiang Yan first took a moment to represent the Chinese characters and numbers in Arabic numerals.

Then the paper is spread out and the calculation begins.

It only took an hour to find all the mistakes.

And this account book, although the best eunuch in the palace was in charge of the accounts, it only took one hour to check the accounts.

"But that's the best account-settling eunuch in the world, even in the entire Great Zhou, he is one of the best people in this field!"

"Not only is it irreproducible, but to get to that point, talent and hard work are indispensable."

"And to recheck his results, it would take double the amount of manpower."

"But!"

"If you use my system."

"As long as I learn systematically, anyone can achieve my efficiency!"

"I'm not a researcher or cultivator in this field, I'm just an ordinary member of this system!"

"Not only does my efficiency have universality, but also replication, energy production! I can train a large number of talents of my level! ”

After listening to Zhao Longji, his voice now trembled slightly, which showed the shock in his heart:

"So ......"

"That's it!"

"It is an immeasurable progress for the entire imperial court's taxation and the inspection of false and wrong accounts!"

"Son-in-law, how did you come up with these symbols? You are a man of God! ”

Xiang Yan smiled shyly, but instead of being greedy for this skill, she talked about the origin of Arabic numerals.

Telling these stories is also to add water to Xiang Yan's previous dry goods, so as to give Zhao Longji a little time to digest slowly, and at the same time, increase his interest in Arabic numerals.

"These are called Arabic numerals, and the symbols in the middle are called arithmetic symbols."

Around 500 AD, with the rise and development of the economy, caste system, the Punjab region in the northwestern part of the Indian subcontinent has been at the forefront of mathematics.

A lot of conceptual nouns are used here, and if they are explained one by one, it will form a burden on Zhao Longji's brain, which will affect his digestion of the things Xiang Yan said before, so Xiang Yan simply didn't explain it, and let Zhao Longji listen to the story.

Astronomer Ayebiheit has made a new breakthrough in simplifying numbers:

He writes down the numbers in boxes, and if there is a symbol in the first box, such as a dot representing 1, then the same dot in the second cell represents ten, and the dot in the third cell represents a hundred.

In this way, not only the number symbols themselves, but also the order in which they are located are also important.

Later, Indian scholars introduced the symbol as zero.

In the 3rd century AD, an ancient Indian scientist in Baghdad invented Arabic numerals.

The oldest counts were probably up to 3, and in order to conceive the number "4", it was necessary to add 2 and 2.

5 is 2 plus 2 plus 1, and the number 3 is derived from 2 plus 1, and it is probably late that the number 5 is represented by five fingers written by hand and the number 10 is represented by ten fingers of both hands.

This principle is actually the basis of mathematical calculations.