To start finding out, Stanford University researchers first peeked into the brains of 28 children as they solved a series of simple addition problems inside a brain-scanning MRI machine.

Here's why math fact fluency matters, and what we know from research about teaching strategies and timed exercises.

The problem-solving strategies used by schooled and unschooled Nigerian children to solve simple addition and subtraction word problems were studied using clinical interviews to find the effect of ...