Left to right.
1
45
75+
__
120
How can you do that left to right? I'm twelve years old and what is this?
I'm a math major, and I actually do not only mental addition, but also some mental multiplication, left-to-right. I learned right-to-left in school/from my mother, but left-to-right is actually not only faster, but also much less mentally taxing.
I'm not certain that it should be taught left-to-right in schools, since it seems like one of those things that needs to be self-developed rather than indoctrinated (much like computation via approximation).
As far as the censorship goes, I'd say it's a tad bit ridiculous. I got most of my sex-ed from my mother when I was 5 ("This is sex. It is not for you unless you are married. Drugs, by the way, are never for you."). The school system's sex ed was pretty much what I'd learned from books, with a few things about peer pressure that had never applied or come up (by virtue of my being a bit of a loner).
Though we must protect our children, there is a point at which "protection" becomes a hindrance. I'd say that's around when we start pulling good dictionaries off shelves and making it nearly impossible to get a reasonable vocabulary.
Not have sex until married may sound reasonable to an adult, but to a teenager that would require a willpower of steel.
Hm... my parents actually phrased it as "not having sex until committed to the point of being practically married to the person," which never seemed like an unreasonable constraint at all.
For what it's worth, by the way, I'm 20 >_>