Square root of 100 (3)

I believe the answer is:

ten

'square root of 100' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for ten that I've seen before include "Five times two" , "X-WORD" , "How many" , "Half a score" , "No of sides of a decagon" .)

I've seen this clue in the Family Time, the Universal, the L.A. Times Daily, The Washington Post, the USA Today and the LA Times.

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