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 3 of 7.

Shivaji said: 3 months ago

Given (1.5625)^2.

= (15625/10000)^2,
= (5*5*5*5*5*5/10*10*10*10)^2,
= (5^2*5^2*5^2/10^2*10^2)^2,
= 5*5*5/10*10.
= 125/100.
Then the answer is 1.25.

(1)

Sandeep said: 1 decade ago

Actually,

225 = 15*15 = 1*2
625 = 25*25 = 2*3
1225 = 35*35 = 3*4

So...
15625 = ????? = 12*13 = 12*12

Hence it'll be 125/100 = 1.25

Rkcckr said: 1 decade ago

1.5625 = 15625/1000.

N Numerator = 5^2*5^2*5^2.
D Denominator = 10^2*10^2.

Square root of N/D = 5*5*5/10*10 = 125/100 = 1.25.

Ranjeet said: 1 decade ago

How instantly get 5 power of 6 = 15625 as explained by Varun initially, is there as short formula please explain any one ?

Murali said: 1 decade ago

root of 1.5625 = ?
We can write it as 15625/10000.
=1.5625
= root of 1.5625 = 1.25

Varun said: 2 decades ago

We can write it as 15625/10000.
5 power of 6 is 15625 and it becomes
5 power of 6/10 power of 4..
125/100=> 1.25

Arun.g said: 1 decade ago

I'm not understand the answer 1.25 according to me we divided 1.5625 the answers are 1, 22, 245 how 1.25 comes.

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)

Hari said: 1 decade ago

Hi friends, I can't to understand how to take square root from any number.
Could any one explain me please.

B.sridhar said: 1 decade ago

Shalini explanation is good but the number is different that is 17079 how to calculate please tell me.

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