Answer :

Final answer:

To determine if each number is a perfect square, take the square root of the number and check if it is an integer. Only 16, 25, and 100 are perfect squares.


Explanation:

The numbers 16, 20, 25, and 100 are given. A perfect square is a number that is the square of an integer. To decide if each number is a perfect square, we take the square root of each number. If the square root is an integer, then the number is a perfect square.

  1. For 16, the square root is 4, which is an integer. So, 16 is a perfect square.
  2. For 20, the square root is approximately 4.47, which is not an integer. So, 20 is not a perfect square.
  3. For 25, the square root is 5, which is an integer. So, 25 is a perfect square.
  4. For 100, the square root is 10, which is an integer. So, 100 is a perfect square.

Therefore, out of the given numbers, 16, 25, and 100 are perfect squares. Only 20 is not a perfect square.


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