Multiple choice

Directions: In each of the following numbers, one number is incorrect. Find out the odd number.

  1. 225

  2. 625

  3. 1225

  4. 1825
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Looking at 225=15², 625=25², 1225=35², and 1825. The first three are all perfect squares, but 1825 is not a perfect square (√1825≈42.7). Specifically, 1825=25×73, making it composite and not square. This makes 1825 the odd one out.

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