Barbie caught a lot of flack back in the ’90s for declaring, “Math class is tough!” Today we find ourselves in the disorienting position of defending her. We recently got a note from an anonymous ...

A key part—though surely not the only part—of early-grades math is ensuring students get the basic arithmetic functions down and, beyond that, making sure they’re able to swiftly and automatically ...

Hear that change jingling in my pocket? Good. I have two little questions for you. I have a quarter, a dime and a nickel. How much money DO I have? I have three coins. How much money COULD I have? The ...