"These are Arabic numerals."

Yun Shu replied.

"Sister Yin taught me."

Seeing that Wei Yan was interested, she told him what number each character represented.

Wei Yan memorized it in less than a quarter of an hour.

Looking at the notebook in Yun Shu's hand, he immediately understood.

"Is this the account book of Baibaozhai?"

"Yes."

"This bookkeeping method is brilliant."

Wei Yan praised it highly.

He discovered that ledgers using Arabic numerals made the accounts clear at a glance, allowing him to have a complete grasp of the inflow and outflow of funds.

"Sister Yin is amazing, she even thought of that."

"That's right."

Yun Shu wholeheartedly agreed.

Her math skills were terrible. If it weren't for Sister Yin teaching them how to use numbers and bookkeeping methods, she would definitely be overwhelmed when she checked the accounts.

"It seems there's a mistake here. It should be 13,500 taels. You've underestimated it by 100 taels."

Wei Yan suddenly pointed to one of the columns.

Yun Shu spent a quarter of an hour recalculating, and as Wei Yan had said, she had underestimated it by one hundred taels.

"Your mental calculation skills are amazing; you can even do it in your head."

Yun Shu looked at him with admiration.

"I couldn't calculate such a large number without writing out the equations."

Wei Yan blushed slightly at her praise.

He stammered, "This is nothing, there aren't many numbers to add up."

"You are definitely more talented than me."

Yun Shu smiled.

"If you don't believe me, I'll test you. Sister Yin gave me a few questions, and I couldn't figure out the answers no matter how hard I tried. Sister Yin said that some children can figure them out at a very young age."

"Shall I give it a try?"

Yun Shu then presented Wei Yan with ten questions, including "Chicken and Rabbit in the Same Cage", "One Hundred Coins and One Hundred Chickens", and "Rabbit Sequence".

Wei Yan solved all the problems in just fifteen minutes.

"All correct!"

Yun Shu looked at him with bright, sparkling eyes.

“Silly Bai, no, Young Master Wei, you must have a talent for divination.”

Wei Yan had never been looked at with such bright eyes before.

He lowered his head shyly and said embarrassedly, "Maybe so, but divination is of little use, no matter how good your talent is."

Whether it was the civil service examination or the military examination, neither required mathematical skills; even if someone had talent, there was no opportunity to use it.

He can't very well become someone else's accountant.

"Who says arithmetic is useless?"

Xiao Qingyin heard this as soon as she returned and immediately retorted.

“Calculation has many uses.”

Whether it's engineering, physics, economics, or architecture, calculation is indispensable.

Take the artillery used to bomb the camp that day, for example. Without mathematical knowledge, it would be impossible to build artillery with a longer range and greater power.

Upon hearing this, Wei Yan's eyes lit up.

"Can mathematical calculations be used to manufacture artillery?"

"Of course. The most powerful weapons are all made by masters of divination."

Xiao Qingyin replied.

For example, atomic bombs and missiles.

Wei Yan was greatly encouraged.

He thought he could use his divination talent to create weapons.

If we could create powerful weapons that ordinary people could use, wouldn't it mean that even someone who doesn't know martial arts could become a powerful person?

He became more and more excited as he thought about it, as if he could see a golden road slowly unfolding beneath his feet.

"Sister Xiao, thank you!"

He expressed his gratitude.

You saved my life three times!

After saying that, he turned to Yun Shu and said, "Thank you too, you saved my life twice!"

Yun Shu couldn't help but retort, "You talk as if you're a cat reincarnated with nine lives."

Wei Yan grinned foolishly.

...

Xiao Qingyin, Yun Shu, and Ji Yunhua arrived back at the Yun residence just before curfew.

Han and Yun Zhao were still awake, anxiously waiting for the three of them to return.

Seeing that they were safe and sound, he was finally relieved.

"You must be exhausted?" Madam Han said with a smile. "The food is keeping warm in the pot. Eat and go to bed early."

"Okay." Xiao Qingyin nodded. "You should go to sleep now."

"Yes, yes, the elderly can't stay up late, Grandma, go and rest now."

Xiao Qingyin had already taken a nap on the way back, so she wasn't sleepy at all now.

After dinner and washing up, I lay on the bed reading a storybook.

When the familiar knock sounded, she didn't look up and called out, "Come in."

"I'm sorry to bother you so late."

This is the Yi River Cold Road of "Yi Jiu".

"It's only been a few days, and you're already acting so distant with me, saying such polite things."

Xiao Qingyin looked up.

The man's face was unusually pale, as if he were seriously ill or still recovering from a severe injury.

"What's wrong? Come here and let me see."

Yi Shuihan dared not approach her at this moment.

If this woman takes his pulse, he'll be exposed.

He stood there and smiled, "I'm fine, I've just been a little tired these past few days. I can carry it here."

Xiao Qingyin: "..."

How did you suddenly become such a respectable married man?

Did Yi Shuihan give him new instructions, forbidding him from flirting with her?

This pitiful little thing... could it be that Yi Shuihan has done something to it?

Several BL (Boys' Love) comics flashed through Xiao Qingyin's mind.

The main characters have all been replaced with Yi Shuihan and Yi Jiu.

One is a cold and aloof Yama-like figure wearing a bronze mask, and the other is a stunningly beautiful and alluring woman.

This is so cute!

Yi Shuihan watched as the woman inexplicably became excited, looking at him with the same kind of gaze a white horse would give a roasted melon seed.

I involuntarily took two steps back.

"Don't worry, I won't make things difficult for you."

Xiao Qingyin smiled ambiguously.

Yi Shuihan: "..."

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