To determine if a number is divisible by 5, what should be checked?

To determine if a number is divisible by 5, the crucial factor is the last digit of the number. A number is deemed divisible by 5 if its last digit is either 5 or 0. This is a basic property of divisibility in mathematics, where certain digits at specific places can define divisibility by particular numbers.

When the last digit is 5 or 0, the number can be evenly divided by 5 without leaving a remainder. For example, both 25 and 40 can be divided by 5, resulting in whole numbers (5 and 8, respectively).

While a last digit of 0 indicates divisibility, it is only one part of the condition. Therefore, the complete criterion is that the last digit must be either 5 or 0. This is why the correct answer encompasses both possibilities, making recognition of 5 as a special case important for understanding divisibility by 5 fully.