But as she continued to fiddle with the keys, her movements became faster.
Soon, the sound of abacuses clicking and clattering filled the palace.
Crisp! Pleasant to the ear!
Amidst these sounds, Nanling's lips began to curve upwards, and confidence began to shine through her face.
"Nanling, you really are a math genius! It hasn't been long at all, and you've already learned to use an abacus!"
Xie Yuan taught Nanling almost all the knowledge he had memorized since childhood.
Besides the multiplication tables for addition and subtraction, there are also multiplication and division. (Read the book!)
In less than three days, Nanling had already made a fortune.
She even incorporated the counting rod formulas she knew into the use of the abacus.
In the end, Xie Yuan, who was terrible at math, was simply beyond teaching.
"Your Majesty, did you...you invented this abacus for me?"
Nanling, however, did not think that being able to use an abacus was anything special. Humph, this abacus itself was invented by her empress.
"No! The abacus wasn't my invention; it actually existed two or three hundred years ago!"
Xie Yuan was not lying; the abacus was invented as early as the Eastern Han Dynasty.
However, in ancient times, information was scarce, and there were various other reasons such as natural disasters and wars.
The abacus was not widely used until the Tang and Song dynasties.
During the Northern and Southern Dynasties, people still used counting rods more often.
"I learned about this amazing tool that helps with arithmetic by reading ancient people's notes."
"However, I really did want to make the abacus for you!"
Xie Yuan said to Nanling with a smile.
Nanling: ...I knew it! My elder sister, the Empress, is the best!
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