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Unit Digit of Squares:
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1. 539:
The unit digit of the square of 539 can be calculated by multiplying the unit digit of 539 by itself. The unit digit of 539 is 9, and when 9 is squared, the result is 81. Therefore, the unit digit of the square of 539 is 1.
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2. 731:
Similarly, the unit digit of the square of 731 can be calculated by squaring the unit digit of 731. The unit digit of 731 is 1, and when 1 is squared, the result is 1. Therefore, the unit digit of the square of 731 is also 1.
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3. 8593:
For the number 8593, the unit digit is 3. When 3 is squared, the result is 9. Therefore, the unit digit of the square of 8593 is 9.
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4. 23904:
The unit digit of 23904 is 4. When 4 is squared, the result is 16. Therefore, the unit digit of the square of 23904 is 6.
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5. 39487:
The unit digit of 39487 is 7. When 7 is squared, the result is 49. Therefore, the unit digit of the square of 39487 is 9.
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6. 39065:
The unit digit of 39065 is 5. When 5 is squared, the result is 25. Therefore, the unit digit of the square of 39065 is 5.
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7. 7358:
The unit digit of 7358 is 8. When 8 is squared, the result is 64. Therefore, the unit digit of the square of 7358 is 4.
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8. 5980:
The unit digit of 5980 is 0. When 0 is squared, the result is 0. Therefore, the unit digit of the square of 5980 is also 0.
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By following these steps, you can easily find the unit digit of the square of any given number.