how to find cube root of 1953125 by the method of estimation? it has 3 groups (maths)
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make the three groups  3. 1-1^st group                             1 953 125

                                           2. 953-2^{nd group} 

                                           1. 125-3^rd group

• from the first group125 take the digit from the ones place i.e. 5 now, take out its cube root. 5*5*5=125    so 5 is the required ones place of the cube root...
• now the second group by the estimation method of the sq. root i.e. 729<953<1000

                                                                                                                                      9<953<10

           so we take the ones place of the smaller number i.e. 9 which would be the tens place of the cube root.

•  and the third group  would remain as it is i.e. 1