I would rarely tell someone; they usually figure it out, or at least compliment me on my intelligence (if not my spelling, lol).
People see it quickly in my son, as well. It is the weak areas which end up surprising them; that he cannot spell and cannot write. He comes accross so well upon meeting him; the problems are less obvious.
He is GATE qualified but I don't think his composite IQ is officially gifted - high, but not over 140. The low scoring components pull a pretty heavy drag on it.
In the end we're all a bundle of strengths and weaknesses and IQ is only a small part of the package - it's been a help in life, but far from a ticket to the fast lane. Realizing that will do a good job of keeping one from getting or acting cocky about it.
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Mom to an amazing young adult AS son, plus an also amazing non-AS daughter. Most likely part of the "Broader Autism Phenotype" (some traits).