two-digit number點解???? 急急急急急!!!

It means numbers that have two digits, such as 10, 11,12.
(in Chinese: 兩位數)

two-digit number即係兩位數,,,好似;10,23,56,53,etc

three-digit number即係三位數,好似:103,647,356,etc

如此類推...

23喱個數裡面o既2係the ten digit;3係the unit digit....