[racket] pre Realm of Racket

I enjoyed reading Realm of Racket (& not embarrassed to say I even learned
a few things, like #; for commenting an S-expression). Nice job, all those
involved.

I was interested in the note on p.9 that Racket was originally a project
that "had middle school students in mind."

Suppose I know some middle-school students who are good at math but have no
exposure to programming. What book / resource would give them an
appropriate foundation to read Realm of Racket?
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