"Xinxin, do you still find it difficult to do addition, subtraction, multiplication, and division with four-digit numbers?"
"Not difficult at all, Xinxin can do addition, subtraction, multiplication, and division! It doesn't matter how many digits."
"Did you find it difficult before?"
"Before?"
"For example, when you first started learning."
"It was difficult then because I did not have enough fingers, even counting my toes. I wanted to use my hair but I have so many strands that I would lose track."
"So why isn't it difficult now?"
Ji Rongxinyue thought about it, then said, "Because Xinxin now understands the principles, and everything follows from them."
"Xinxin is really smart."
Ji Xinghe exclaimed from the bottom of his heart, touching Ji Rongxinyue's head through the protective helmet.
