A nearly year-old Facebook event for a "simple maths competition" has been one of the most viral posts on the platform for six months.
  • Seasoned_Greetings@lemm.eeEnglish
    22·
    1 年前

    Because it’s the only other thing about that system at all. OP wasn’t teaching, just showing what that system does. If you looked for a source that explains it you’d be told