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Class 9-10, JEE & NEET
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Find the greatest number of two digits which is a perfect square.
We know that 10 is equal to 100 and 9 is equal to 81.
Since 10 and 9 are consecutive numbers, there is no perfect square between 100 and 81. Since 100 is the first perfect square that has more than two digits, 81 is the greatest two-digit perfect square.