How to Prepare Teachers to Be Effective Math Teachers

What does it take to be an effective math teacher? Some individuals will argue that those that grasph math concepts easily are necessarily the best teachers because they haven't experienced being out of the comfort zone and struggling to understand. Others feel that you really need to understand math to teach math.

What does the research say?  A IEA study, led by Michigan State University says teacher preparation is key.  They have discovered that the countries that best prepare math teachers meet several key conditions. See the full article in Science Daily.