3. You are told that 1,331 is a perfect cube. Can you guess without factorisation what is its cube root? Similarly, guess the cube roots of 4913, 12167,32768.
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Similarly, guess the cube roots of 4913, 12167, 32768. We know that, since, the unit digit of cube is 1, the unit digit of cube root is 1. ∴ We get 1 as unit digit of the cube root of 1331. ... ∴ The ten's digit of our cube root is taken as the unit place of smallest number.
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