Over the three years Jordan Ellenberg was writing his book, he repeatedly encountered the same reaction to its subject. “I’d be at a party, and I’d tell someone what my book was about, and then I’d be ...

COLUMBIA, S.C. — If your child's math homework has you scratching your head confused, you're not alone. Parents who grew up in the '80s, and '90s learned basic formulas, such as long division to solve ...