Question

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find the cube root through estimation 91125

Answer 1

  9 1    1  2  5

for the last three digits: 125, we find the digit 5 results in the units digit 5 in the given number as 5³ ends in 5.

for  9 1 ,      4³ = 64 is the highest cube < 91.

   so answer is  45,

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Answer 2

First we have to make pair of 2 and 3
91 it comes between 64 and 124.
125 unit digit 5 = 5

you can solve any cuberoot by following table