2. A number is divisible by 2 (is even) if it has a ones digit of 0, 2, 4, 6, or 8 (that is, it has an even ones digit).
Examples:
A number is divisible by 3 if the sum of its digits is divisible by 3.
Examples: ,077
A number is divisible by 6 if its ones digit is 0, 2, 4, 6, or 8 (is even) and the sum of its digits is divisible by3.
Examples:

3. A number is divisible by 9, if the sum of its digits is divisible by 9.
Examples:
A number is divisible by 10, if its ones digit is 0.
Examples:
A number is divisible by 5 if its ones digit is 0 or 5.
Examples:

4. A number is divisible by 4 if the number named by its last two digits is divisible by 4.
Examples:
A number is divisible by 8 if the number named by its last three digits is divisible by 8.
Examples: ,911
3.2 Homework:
Problems 17, 19, 21, 23 – your must justify your answers by explaining in words or showing work.