The previous parts were still decipherable, consisting of several three-to-five-or-six-digit multiplication problems, without using calculations.
But the following problem used a written formula, and the handwriting was different from the ones above...
Recalling what Rong Zhan had said just now, Tan Jincheng couldn't help but frown.
It seemed that Rong Zhan had given Yun Rui a few problems; those with obviously mature handwriting at the very beginning. The subsequent answers, with childish strokes, were clearly written by Yun Rui.
As for the ones written with formulas, that was also Rong Zhan's handwriting. Yun Rui didn't write any column calculations at all but directly wrote the answers after the equal sign.
Tan Jincheng squinted his eyes, obviously noticing something suspicious about all this.
Could it be that Yun Rui had a strong mental arithmetic ability?
Just then, Yun Rui handed Tan Jincheng another piece of paper.
