Question

If a number ends with $0$ or $5$ then the number is divisible by ______

Answer 1

Apply the divisibility test

According to the test of divisibility by $5$ , if the last digit /the digit in the unit's place of a number is either $0$ or $5$ then the number is divisible by $5$.

For example: $210$ is a number with $0$ in its units place.

By prime factorisation we can write,

$210=2\times 3\times 7\times 5$

$5$ is a factor of $210$. So, the number is divisible by $5$.

All numbers with $5$ in the units place are multiples of $5$. Hence , all of them are divisible by $5$.

Hence, we can conclude that, any number with $0$ or $5$ in its units place, is divisible by $5$.