Aptitude - Square Root and Cube Root - Discussion

Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 4)

Square Root and Cube Root

1.5625 = ?

1.05

1.25

1.45

1.55

Answer: Option

Explanation:

   1|1.5625( 1.25
    |1
    |-------
  22| 56
    | 44
    |-------
 245| 1225
    | 1225
    |-------
    |    X
    |-------

1.5625 = 1.25.

Discussion:

62 comments Page 4 of 7.

JUBANLAK SUTNGA said: 3 years ago

= 15625/10000,
= 25/16,
= √5^2/4^2,
= 5/4,
= 1.25.
It's the easiest way to find the answer.

(59)

Hareesh said: 7 years ago

(15625/10000)^0.5.
= (15625^0.5)/{10^(4/2)},
= {(5*5*5)(5*5*5*)}^0.5/(10^2).
= 125/100,
= 1.25.

Abinash said: 2 decades ago

Well I think in the 3rd step it should be something after 22 not 24..yes or no? if 245 then how?

Sheetal said: 1 decade ago

Thanks for the simple explanations. Please include shortcut tricks along with the explanations.

(1)

Rahul said: 7 years ago

@Varun

The 3rd step is;

{(5*5*5*5*5*5)/10*10*10*10)},
= 5*5*5/10*10,
= 125/100,
= 1.25.

(1)

Anil said: 1 decade ago

Can any one tell why 22 and 245 came in solution they give in the explanation?

Rakshit said: 1 decade ago

@Sakshi is this method works for all numbers that has the last digit as 5 ?

Imran khan said: 1 decade ago

Let me know how can we understand 22 is to come or 245 in particular steps?

Kumari said: 1 decade ago

@Dipankar
Nice Trick dipankar.
Please keep sharing your knowledge..thanks!

Rajesh said: 1 decade ago

the power 6 and power 4 get cancel. then we have 5 power 3 and 10 power 2.

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