numbery

But you might put autism aside and ask us what we have to say about someone like the three-year-old who announced at his first Math Circle class: “I'm very numbery”—and was.

The context refers to how you use an expression. You've actually already seen some contextual operations with numbers and strings. When you do numbery sorts of things, you get numeric results. When you do stringy sorts of things, you get string results.