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 3 of 7.
Prashant said:
1 decade ago
1.25
---------------
1*1| 1.5625
+1| 1
----------------
22*2|056
+2|044
|-
----------------
245*5|1225
1225
--------------
0000
So answer is 1.25.
So that is the region, why we take 22 and 245.
---------------
1*1| 1.5625
+1| 1
----------------
22*2|056
+2|044
|-
----------------
245*5|1225
1225
--------------
0000
So answer is 1.25.
So that is the region, why we take 22 and 245.
Sai prasanna said:
1 decade ago
We can easily calculate by given options i.e.,
1.25 * 1.25 = 1.5625.
1.25 * 1.25 = 1.5625.
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.
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.
Som said:
10 years ago
Remember trick, in 15625 last two digits can be obtained by multiplying 5*5. Now 156 can be obtained by multi 12*13. So answer will be 125 now put decimal accordingly.
Siva said:
10 years ago
1.25 *1.25.
If the last digits ends with 5 always in both the sides multiply 5*5.
Then in the first digit add one number.
12 + 1 = 13.
Now multiply 12*13 = 156.
This method will be more easy.
If the last digits ends with 5 always in both the sides multiply 5*5.
Then in the first digit add one number.
12 + 1 = 13.
Now multiply 12*13 = 156.
This method will be more easy.
Jay said:
9 years ago
From the above explanation We get the answer square root of 15625 = 125.
Now in the question the decimal digits are 4.
So in the answer we should have 4/2 = 2 digits in decimal after point so answer is 1.25.
Now in the question the decimal digits are 4.
So in the answer we should have 4/2 = 2 digits in decimal after point so answer is 1.25.
Laks said:
9 years ago
@Shalini and @Dipankar
Your method is Right.
Your method is Right.
Rudh said:
9 years ago
@Sandhya.
Thank you so much.
Thank you so much.
Kiran said:
9 years ago
Thank you friends. It is easy to understand now.
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.
= (15625^0.5)/{10^(4/2)},
= {(5*5*5)(5*5*5*)}^0.5/(10^2).
= 125/100,
= 1.25.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers