1. How can you tell if a number is a multiple of ten?
2. How can you tell if a number is a multiple of five?
3. Write down the multiples of 11 from 1 x 11 to 9 x 11.
4. The ones-digits for multiples of nine follow a pattern. What is the pattern?
5. A power of nine is a multiple of nine by itself. The first power of nine is 9. The second power of 9 is 9×9. The third power of nine is 9x9x9. The ones-digits of powers of nine form a pattern. What is the pattern?