Aptitude - Square Root and Cube Root - Discussion
Discussion Forum : Square Root and Cube Root - General Questions (Q.No. 14)
14.
How many two-digit numbers satisfy this property.: The last digit (unit's digit) of the square of the two-digit number is 8 ?
Answer: Option
Explanation:
A number ending in 8 can never be a perfect square.
Discussion:
8 comments Page 1 of 1.
Jayram said:
7 years ago
If the units place is 1, 2, 3, 4, 5, 6, 7, 8, 9.
Square of all number = 1, 4, 9, 16, 25, 36, 49, 64, 81.
Then, take unit value for all squares =1, 4, 9, 6, 5, 6, 9, 4, 1.
And approx is 2, 3, 7, 8.
Square of all number = 1, 4, 9, 16, 25, 36, 49, 64, 81.
Then, take unit value for all squares =1, 4, 9, 6, 5, 6, 9, 4, 1.
And approx is 2, 3, 7, 8.
Abi said:
8 years ago
2 = 4.
3 = 9.
4 = 16.
5 = 25.
7 = 49.
9 = 81.
10 = 100.
As you can see all squares have 0, 1, 4, 5, 6, 9 in units place.
So if we have 2, 3, 7, 8 in units place it square root is not perfect.
3 = 9.
4 = 16.
5 = 25.
7 = 49.
9 = 81.
10 = 100.
As you can see all squares have 0, 1, 4, 5, 6, 9 in units place.
So if we have 2, 3, 7, 8 in units place it square root is not perfect.
BALU said:
8 years ago
I can't understand so please explain again.
(1)
Aarti said:
9 years ago
Number ending with 8 is not a perfect square.
Veena said:
1 decade ago
Number ending with 0, 1, 4, 5, 6, 9 are the perfect squares rather than these are not perfect squares.
M.V.KRISHNA/PALVANCHA said:
1 decade ago
Hello pawan and kala.
The two digit numbers are from 10 to 99.
The numbers with 8 in units place are.
18, 28, 38, 48, 58, 68, 78, 88, 98.
These numbers do not have a perfect square (s*s).
So answer is none of these.
Hope you understand.
The two digit numbers are from 10 to 99.
The numbers with 8 in units place are.
18, 28, 38, 48, 58, 68, 78, 88, 98.
These numbers do not have a perfect square (s*s).
So answer is none of these.
Hope you understand.
Kala said:
1 decade ago
Please explain.
Pawan goyal said:
1 decade ago
hw this could be possible that a number ending with is not a perfect square
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