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Question
What will be the unit digit of the square of the given number?
81
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Solution
- We know that if a number has its unit’s place digit as a, then its square will end with the unit digit of the multiplication a × a.
- Since the given number has its unit’s place digit as 1, its square will end with the unit digit of the multiplication (1 ×1 = 1), i.e., 1
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