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 5 of 7.
Sheetal said:
1 decade ago
Thanks for the simple explanations. Please include shortcut tricks along with the explanations.
(1)
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.
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.
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.
The 3rd step is;
{(5*5*5*5*5*5)/10*10*10*10)},
= 5*5*5/10*10,
= 125/100,
= 1.25.
(1)
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