It really is, and I can't tell you how many times I've had to explain it to seasoned engineers. They show me something and I just say "you do your unit math on that, because it doesn't make sense if you did" and get blank stares back.

So many problems -- even those given to experienced engineers -- are solvable by simply remembering basic math everyone was taught (I was going to say "everyone learned" but obviously that's a false statement) in high school.