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 5 of 7.

Shalini said: 1 decade ago

15625 we can distributed in two parts
like 156/25 becouse we calculated the sqaure any number were ends digit is 5 the last digit of answer is always 5. now camo to second part of d no. square of 12 is 144and square of 13 is 169. square of 13 is > 156 so that we took 12 now we get "125" is the right ans.

Abhay said: 1 decade ago

Sakshi...U r the Best!!
Awesome...
Thnks
Too...good

Rakshit said: 1 decade ago

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

Anila said: 1 decade ago

((5^6)1/2)/((10^4)1/2)=5^3/10^2=5*5*5/10^2=125/10^2=125*10^-2=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.

B.sridhar said: 1 decade ago

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

Kiran said: 1 decade ago

Varun explaination is very good.

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

PAYAL HADKE said: 1 decade ago

VERY APT ANSWER MURLI

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 ?

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