every number is divisible by 1 (Identity property)
A number is divisible by 2 if it is even (ends in 0,2,4,6,or 8)
A number is divisible by 3 if the sum of the digits in the number is divisible by 3.
A number is divisible by 4 if the last two digits are divisible by 4
A number is divisible by 5 if it ends in a 5 or a 0.
A number is divisible by 6 if it is divisible by 2 and 3 (use both those rules.)
A number is divisible by 9 if the sum of its digits is divisible by 9.
A number is divisible by 10 if it ends in a 0.
So by these rules
The sum of the digits are 8 + 0 = 8 so it is not divisible by 3 or 9.
1, 80
2, 20
4, 20
5, 16
10, 8
have a great day!
