Which of the following squares will end with the digit 1?
Show answer & explanation
Correct answer: A
Explanation
The square of a number ends in 1 only if the units digit of the number is 1 or 9.
The units digit of 91 is 1; therefore, the last digit of 91² will be 1.
Verification:
91² = 8281
Thus, this square ends in 1.