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DS entered first grade last year (early entry, skipped K). I'd have to say that it was mixed results at best. The school did not see any of the same ability that we see. The teacher might have put him as "high average" if you will. Some of that is certainly due to the common misperception that high achieve equals high ability. We also has some behavioral issues that were thrown in to the mix for good measure which didn't leave us in a happy place academically.

He was "high average" as compared to kids older than he is? How is that not high ability?

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Are we creating more of a problem by teaching him advanced math that he wouldn't see until 5th grade (or higher!).

I don't think so! You are feeding his interest...I don't see that as a problem.