We know 5^3 = 125 and 6^3 = 216. with that in mind,suppose you were told the number 148,877 is the cube of some other whole number. what would that other number be?
( You don't need a calculator to do this problem.Once you find the right track, it's simpler than it firs appearance .It doesn't look simple, though, does it??
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since cube of 3 brings the last digit as 7 => last digit of the cube root is 3. now, 5 3 = 1 2 5 = > 5 0 3 = 1 2 5 0 0 0 < 1 4 8 8 7 7 6 3 = 2 1 6 = > 6 0 3 = 2 1 6 0 0 0 > 1 4 8 8 7 7 so, it lies between 50 and 60. only possible is 53 since its last digit is 3. so 53