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 1 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)

Swetha said: 6 years ago

Let we know x2 = a.

So, x = √a.

Therefore by referring to all the options with there square;
Let options
A)1.05 * 1.05 = 1.1025
B)1.25 * 1.25 = 1.5625.

So by this, we recognise option B is correct.

(13)

Wokete Saeed said: 4 years ago

Thanks for explaining @Dinesh Kumar.

(3)

Pranitha said: 7 years ago

(15625/10000) ^1/2.

We have to cancel the above 2values.
Then we get (25/16) ^1/2,
= 5/4.
The ans is 1.25.

(3)

Sheetal said: 1 decade ago

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

(1)

Sidhu said: 8 years ago

@ALL.

Very simple short cut
1+5+6+2+5 = 8

[A]. 1.05(1+5)=6.
[B]. 1.25 (1+2+5)=8.
[C]. 1.45(1+4+5=10)=(1+0)=1.
[D]. 1.55(1+5+5=11)=(1+1)=)2.

So the answer is B.

(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)

Honnu said: 6 years ago

@Sidhu.

1+5+6+2+5=19,

How it will be 8?

Please explain.

(1)

Karthick said: 6 years ago

Thanks for explaining the answer @Varun.

(1)

Bhavani said: 6 years ago

It's very clear for understanding. Thank you @Swetha.

(1)

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