Math question

When did high school students in the US stop possessing the ability to do fractions? Pick some random 20 year old kid on the street who is a product of our wonderful education system and ask him/her what 2+4/5 is. Most won't be able to do it. They couldn't do it if you stuck a gun to their head. I want to physically beat them with their TI-83s - which they clutch reflexively like Linus clutches his blanky. We should all go back to slide rules or something. At least until the younger generation catches up. My MOM can do fractions - in her HEAD even! Yet she is completely incapable of sending an email to me.