Math scores in the U.S. have been so bad for so long that teachers could be forgiven for trying anything to improve them. Unfortunately, many of the strategies they're using could be making things ...

To be sure, there are many reasons that American schools are failing to teach math: an aversion to standardized tests, powerful teachers unions, chronic absenteeism and grade inflation, to name a few.

Math scores in the U.S. have been so bad for so long that teachers could be forgiven for trying anything to improve them.