Question

Using divisibility tests, determine which of the following numbers are divisible by 5 and 10.
i) 639210
ii) 17852

Answer 1

A number is divisible by 5 if its unit digit is either ‘0’ or 5.
A number is divisible by 10 if its unit digit must be 0.
i) 639210
639210 has 0 in its unit place.
$\therefore$ it is divisible by 5 and 10.
ii) 17852
17852 has 2 in its unit place.
$\therefore$ it is not divisible by 5 and 10.