Question

What will be the unit digit of the square of the given number?

81

Answer 1

• We know that if a number has its unit’s place digit as a, then its square will end with the unit digit of the multiplication a × a.
• Since the given number has its unit’s place digit as 1, its square will end with the unit digit of the multiplication (1 ×1 = 1), i.e., 1