Ancient Wen Heng answered him, his eyes still on the account book. "Of course. Didn't I just tell you where the mistakes were? How could I possibly know if I hadn't run the numbers?"
"How did you do that?" He Nan asked, confused, seeing that the abacus he'd casually brought over was still sitting there unused, like a decoration.
Ancient Wen Heng replied without looking up, "The abacus is in my head. If you want to learn, I can teach you."
Having started practicing this form of mental calculation since childhood, Ancient Wen Heng was exceptionally skilled at it.
"An abacus in your head?" He Nan simply pulled up a stool and sat quietly to the side to watch. 'At this speed,' he thought, 'it probably won't take long to get all these accounts settled.'
He grew even more curious as he watched Ancient Wen Heng flipping through the pages as if it were a game, only occasionally picking up his brush to make a mark.
