Worthies revealing why schoolchildren are innumerate? (8)

I believe the answer is:

notables

This clue is a double definition.

'worthies' is the first definition.

'why schoolchildren are innumerate?' is the second definition.
(no multiplication times tables)

'revealing' is the link.

(Another definition for notables that I've seen is " Celebrities".)

I've seen this clue in The Guardian.

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