Divisibility rules

A divisibility rule is a shortcut that helps determine if one number can be divided by another without leaving a remainder.

A number is divisible by 2 if its last digit is even (0, 2, 4, 6, or 8).

Yes, because the sum of its digits (8 + 1 = 9) is divisible by 3.

A number is divisible by 3 if the sum of its digits is divisible by 3.

4 is an even number.

A number is divisible by 5 if its last digit is 0 or 5.

495 is divisible by 9 because the sum of its digits (4 + 9 + 5 = 18) is divisible by 9.

A number is divisible by 10 if its last digit is 0.

Yes, because its last digit (4) is even.

A number is divisible by 4 if the last two digits form a number that is divisible by 4.