I heard this almost every day as a student when my teachers assigned math problems--odds in class, evens for homework--at the end of each section in the book. And many teachers still do this today.

Three school math problems have thousands of people on Facebook and Reddit talking. The reason? Even though the students' answers appear to be totally correct, they were still marked wrong. Here's one ...

At a middle school in California, the state testing in math was underway via the Smarter Balanced Assessment Consortium (SBAC) exam. A girl pointed to the problem on the computer screen and asked ...