Number Sense

This is where we need to go! 

From the link:

"If you are connected with the world of K-12 mathematics education, it’s highly unlikely that a day will go by without you uttering, writing, hearing, or reading the term “number sense”. In contrast everyone else on the planet would be hard pressed to describe what it is. Though entering the term into Google will return close to 38 million hits, it has yet to enter the world’s collective consciousness. Stanford mathematician Keith Devlin explains what it is."

[20170113]

And further this is how to get there, from the inventor of the computer program Mathematica.
[20170115]