1. If the sum of digits is divisible by 9, then the number is divisible by:

2. Prime factorization is useful to find:

3. A number ending with 5 is divisible by:

4. If a number is divisible by 2 and 3, it is also divisible by:

5. Which number is divisible by both 3 and 9?

6. The HCF of 12 and 18 using prime factorization is:

7. Which number has only two factors?

8. Which is the prime factorization of 90?

9. Which test can be used to check divisibility of 11?

10. The prime factorization of 100 is: