I forget the exact context, but I remember my elementry school math teacher telling us "you wont have a calculator with you at all times" when memorizing the ti

I forget the exact context, but I remember my elementry school math teacher telling us "you wont have a calculator with you at all times" when memorizing the times tables. While she may have been dead wrong on that one, i'm definitely glad I don't have to rely on looking up / deriving the basics for every domain.