Home › IBPS Clerk › Quantitative Aptitude › Square Roots › Which digit can never be the units digit of a sq…
Which digit can never be the units digit of a square number?
A7
B1
C6
D9
Answer & Solution
Correct answer: A. 7
1. Squares end in 0, 1, 4, 5, 6 or 9.
2. They never end in 2, 3, 7 or 8.
3. So 7 is impossible.
_Source: NCERT Class 8 Mathematics, Chapter 6, Squares and Square Roots._
Related questions
A right triangle has hypotenuse 5 cm and one side 3 cm. The third side squared is:90 = 2 x 3 x 3 x 5. Since 2 and 5 are unpaired, 90 is:The square root of 6400 is:48 = 2x2x2x2x3 has one unpaired 3. The smallest number to multiply 48 by to get a perfect 256 = 2x2x2x2x2x2x2x2. Pairing the factors, its square root is:Subtracting 1, 3, 5, ... from 81 reaches 0 at the 9th step. So the square root of 81 is:A perfect square has two integral square roots; the root symbol denotes only the:Finding a number whose square is known is called finding the: