If a number has 1 or 9 in the unit's place, then its square ends in___
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if the last digit of a number is 1 or 9, its square ends in 1; if the last digit of a number is 2 or 8, its square ends in 4; if the last digit of a number is 3 or 7, its square ends in 9; if the last digit of a number is 4 or 6, its square ends in 6; and.
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If a number has 1 or 9 in the unit's place, then its square ends in 1 (last digit 1)
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