Mathematical literacy is an important skill for the 21st century. Being to to do simple math in your head is useful and important, and we're losing that ability.
"There’s a culture among schoolkids to dislike math and the perception that it’s largely useless."
"...as soon as you fear a subject, or don’t want to learn it, you won’t."
“I just don’t get math.”
“I’ve never been any good at math.”
“I don’t like it.”