As Barbie once famously said, “Math class is tough.” She stopped saying it pretty quickly because everybody worried she was propagating negative stereotypes about girls, but let’s face facts: it’s ...

All questions courtesy Alex Bellos, author of The Grapes of Math: How Life Reflects Numbers and Numbers Reflect Life. Correction appended Aug. 14, 6:35 p.m. The original version of this quiz misstated ...