Question

Find the cube root of the number by looking at the last digit and using estimation.

Easy
Solution
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The given number can be written as
Take the last group i.e.
The last digit of perfect cube is . So, the last digit of the cube root is .
Therefore, the rightmost digit is .
Now take the next group i.e. .
To find the largest cube number we can subtract from so that the result is  
We can subtract from , because (If we subtract , we get ).
Thus, the next neighbour digit of the answer is .
Hence,

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