What is the smallest number by which 2880 must be divided in order to make it into a perfect square ........

Math and Mental Ability Number System

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What is the smallest number by which 2880 must be divided in order to make it into a perfect square ?

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Explanation:

By trial and error method, we get
2880/3 = 960 is not a perfect square
2880/4 = 720 is not a perfect square
2880/5 = 576 which is perfect square of 24
Hence, 5 is the least number by which 2880 must be divided in order to make it into a perfect square.

Hence, option 4 is the correct answer.