what will be the unit digit of the square of 7992
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The unit digit of a perfect square can be only 0, 1, 4, 5, 6 or 9. Which means that 2, 3, 7, 8 can never be the unit digit of any perfect square. Now, let us find the unit digit of the square of the number 799. We know that 1×1 is always 1 and 9×9 is always 81.
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2*2=4
so the units digit is 4
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