Divisibility by 10

 A number divisible by 10, If it has 0 (zero) in its, ones place.

The multiples of 10 is 10, 20, 30, 40, 50, 60 70….

 We get something common in these numbers.
 We see that each of these numbers has 0 in its ones place.

 Some more numbers like 100, 200, 1100, 1000, 4020, 5010, has 0 in ones place.

 All numbers that has 0 in ones, place are divisible by 10.

 So we find that A number divisible by 10, If it has 0 (zero) in the ones place.