What will be the unit digit of (528)²
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The square root of 16 is 4. So our first digit is 4. The units digit of 2116 is 6.
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A few other things to keep in mind:
If a perfect square ends with a 1, then the unit's digit of its square root has to be either 1 or 9.
If a perfect square ends with a 4, then the unit's digit of its square root has to be either 2 or 8.
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