Poor math can only show that children's logical thinking has not been opened. Every child acquires skills through learning the day after tomorrow. There is no difference between stupidity and cleverness. The sooner you open your mind, the stronger your thinking ability and the smarter you look.

There is a little sister at home, in the fifth grade of primary school. When I got home, I helped her with her math. I have a discount problem. The topic says that the original price of clothes is 100, and now there is a 10% discount. I asked what the current price was. I asked her what a 10% discount meant, but she said she didn't know, so I told her that a 10% discount was nine tenths, and she immediately wrote: 100*9/ 10=90 (yuan) in her notebook.

I wanted to see if she understood what I said, so I asked her what the current price would be if there was a 30% discount, and she didn't know how to calculate it. This is the expression of not being open-minded If you are open-minded, you tell her that the discount of 10% is multiplied by nine tenths, and then the discount of 70% will be multiplied by seven tenths.