It's square root day

Today - 3/3/09 - happens to be a square root day! It's because 3 is the square root of 9 (3 × 3 = 9). The previous square root day was 2/2/04. And then next one is 4/4/16.

An exercise for students: how many square root days are there in a century?
See Wikipedia for an answer..

Read also how the teacher Ron Gordon celebrates square root day!

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