Aptitude - Square Root and Cube Root - Discussion
Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 4)
4.
1.5625 = ?
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.
Oshin said:
1 decade ago
Ya its 1.25, one method is.
Take last 2 digits 25, and square root of it is 5.
And 156 = 12*13, we must take smaller number, 12.
So its 125 and add decimal, then its 1.25.
Take last 2 digits 25, and square root of it is 5.
And 156 = 12*13, we must take smaller number, 12.
So its 125 and add decimal, then its 1.25.
Priya said:
1 decade ago
We can write 1.5625 as 15625/10000.
So, (125)^2=15625 and (100)^2=10000.
So, by taking square root of this it became 125/100 So the answer is 1.25.
So, (125)^2=15625 and (100)^2=10000.
So, by taking square root of this it became 125/100 So the answer is 1.25.
Dulberg said:
1 decade ago
@Shruti.
I think @Dipankar was just trying to give a clue. Personally I find it very useful. It gives you the idea about the figure you should expect.
I think @Dipankar was just trying to give a clue. Personally I find it very useful. It gives you the idea about the figure you should expect.
Lithin said:
1 decade ago
Can anyone please explain the factorization method?
Imran khan said:
1 decade ago
Let me know how can we understand 22 is to come or 245 in particular steps?
Shruti said:
1 decade ago
@Dipankar.
In the case of 1089 you found out the root of last digit i.e. 9 but in case of 3249 you did calculate the root of last two digits i.e.49 instead of the last digit only i.e. 9. Isn't it contradicting each other?
In the case of 1089 you found out the root of last digit i.e. 9 but in case of 3249 you did calculate the root of last two digits i.e.49 instead of the last digit only i.e. 9. Isn't it contradicting each other?
Shali said:
1 decade ago
5 | 15625
----------
5 | 3125
----------
25| 625
----------
25| 25
----------
| 1
5*5*25*25 while taking square root 5*25 = 125 i.e 1.25 decimal after 2 digits.
----------
5 | 3125
----------
25| 625
----------
25| 25
----------
| 1
5*5*25*25 while taking square root 5*25 = 125 i.e 1.25 decimal after 2 digits.
Dinesh kumar said:
1 decade ago
5| 15625
----------
5| 3125
----------
5| 625
----------
5| 125
----------
5| 25
----------
5| 5
----------- So 5*5* 5*5* 5*5 get each one 5*5*5=125.
5
1.5625 after the point we have four(2*2)digit.
So put the point before two digit 1.25 is the answer.
----------
5| 3125
----------
5| 625
----------
5| 125
----------
5| 25
----------
5| 5
----------- So 5*5* 5*5* 5*5 get each one 5*5*5=125.
5
1.5625 after the point we have four(2*2)digit.
So put the point before two digit 1.25 is the answer.
Kumari said:
1 decade ago
@Dipankar
Nice Trick dipankar.
Please keep sharing your knowledge..thanks!
Nice Trick dipankar.
Please keep sharing your knowledge..thanks!
Krishna teja said:
1 decade ago
@Dipankar.
Thank you very much dude :).
Thank you very much dude :).
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