Suggest any shortcut method to calculate the square and cube root. (it must be trustworthy)
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Suggest any shortcut method to calculate the square and cube root. (it must be trustworthy)
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see for example have a number 125.
put the factor tree for it.
125
/ \
5 25/ \
5 5/ \
5 1
now the factors are 5*5*5
pair them up in 3s (only same numbers should be paired)
thus only one group is available having three 5's .
consider them as 1
we get only one 5.thus the cube root of 125 is 5.
now for more understanding , take 1000
if we put a factor tree we get,
2 *2*2*5*5*5
again pair them in 3's
put one group of 3 numbers as one
we get (2*2*2) and (5*5*5)
=2*5
=10
10 is the cube root of 1000
hope it helps!!!!