Q. Please give any general rule to find cubic root of any number which result is less than 100. Ans. 1st find the 1st digit of solution. If fist digit of no 3 then 1st digit of sol is 7 and following 3 -> 7 7 -> 3 2 -> 8 8 -> 2 now if 1st digit is except to these it remain same. eg. 1st digit of the cubic root of 175616 is 6 and for 658503 is 7. Now, focus on rest digit of number leaving 1st 3 digit (eg. 175 and 658 from above example). and find the no less than 10 which cube is equal than that or just small than that or greatest no which cube is smaller than that no. (eg. for 175 is 5^3=125, and for 658 is 8^3 512). That means final anses are cubic root of 175616 is 56 and 658503 is 87.
Posted on: Fri, 16 Aug 2013 19:59:21 +0000
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