I’m a Chinese that is fluent in English and speaks basic Japanese. I have to thumb up for you! You are AWESOME!!! It surprised me that you can figure out (reason out) the meanings of basic Chinese by solving some math problems.
Someone did the translation and your video has gone viral in China, truly impressive. I'm familiar with every single character on the paper but not when they come together, seems like it is just the opposite for you. 君数学本当上手