1. The prime decomposition of a number is 2 x 11. What are all possible factors of the number?

2. The prime decomposition of a number is 2 x 3 x 3 x 5. What are all possible factors of the number?

3. The prime decomposition of a number is 2 x 3 x 5 x 7. Is this number divisible by 21?

4. The prime decomposition of a number is 2 x 2 x 5 x 5 x 5. How many zeros are at the right end of the number (in other words, how many multiples of 10 can go into the number)?

5. Sally has opens her book. The product of the two open page numbers is 210. What are the page numbers?