Which of the following is a requirement for divisibility by 5?

Divisibility by 5 is determined by the last digit of a number. For a number to be divisible by 5, it must end in either 0 or 5. When a number has a last digit of 0, it satisfies the requirement since 0 is one of the integers that indicates the number is divisible by 5. Similarly, if the last digit is 5, the number is also divisible by 5. Therefore, the requirement for divisibility by 5 is the presence of either 0 or 5 as the last digit.

This foundational rule for divisibility helps with simpler calculations when working with larger numbers, making it easier to determine divisibility without performing long division. Understanding this concept is essential for elementary mathematics, as it forms the basis for recognizing and interpreting numerical properties effectively.