Add Yahoo as a preferred source to see more of our stories on Google. Life gets busy, and sometimes those basic math skills from school days get a little rusty. Whether you're budgeting, measuring for ...

Get out your timer and number two pencil to see if your arithmetic skills are still sharp.

Add Yahoo as a preferred source to see more of our stories on Google. We like to think that we're pretty good at math, especially after years of schooling. But every once in a while, a simple ...

At first glance, the problem seems ridiculously simple. And yet experts have been searching for a solution in vain for decades. According to mathematician Jeffrey Lagarias, number theorist Shizuo ...