A friend's daughter is 6 or 7 and she already intuitively understands math in certain ways, such as how to add two very large numbers in your head, that I didn'

A friend's daughter is 6 or 7 and she already intuitively understands math in certain ways, such as how to add two very large numbers in your head, that I didn't understand until college. Only one anecdote, but Common Core seems to be working for math if she is the new norm.