The smallest digit to make a number divisible by 5 is zero.
Divisibility Rule of 5
A number is divisible by 5 if its last digit is either 0 or 5. The question is asking for the smallest digit that satisfies this condition.
Explanation
The reference states that placing 0 after a number makes it divisible by 5. For example, the number 2164 becomes 21640, which is divisible by 5. Similarly, 2197 becomes 21970, which is also divisible by 5. The result of this is that the last digit is zero, and all numbers ending in zero are divisible by 5. We could also use the number 5 as the last digit. However, zero is smaller than five; therefore, 0 is the smallest digit to make a number divisible by 5.
Examples
- If we have the number 123, adding a 0 makes it 1230, which is divisible by 5 (1230 / 5 = 246).
- If we have the number 4567, adding a 0 makes it 45670, which is divisible by 5 (45670 / 5 = 9134).
