After 15 years of inquiry into children’s understanding and learning of whole numbers, I can sum up what I have learned very simply. To teach math, you need to know three things. You need to know ...

Numbers figure pretty high up on the list of what a computer can do well. While humans often struggle to split a restaurant bill, a modern computer can make millions of calculations in a mere second.

At the intersection of psychology and neuroscience is a phenomena called “number sense”—an intuition of the magnitude and relationships of numbers that is found in humans. In children and adolescents, ...