Question

What is the least number which must be subtracted from 10420 to make it a perfect square ?

• A. 219
• B. 200
• C. 189
• D. 16

Answer 1

The correct option is D 16

$10000<10420$
$100<\sqrt{10420}$
$10404<10420$
$102<\sqrt{10420}$
$10609>10420$
$103>\sqrt{10420}$
Nearest Number laser than 10420 is 10404
The Number to be subtracted from 10420 to make it perfect square is $10420-10404=16$