Number Theory

1. Without using calculators, determine if 963 is divisible by 9.

2. Without using calculators, determine if 472 is divisible by 3.

3. List the prime numbers less than 15. Do not leave spaces, separate the numbers by a comma.

4. Calculate 3.3 x 2.5 + 5.7 x 2.5

5. What is a real number?

6. What is the highest common factor of 14 and 21?

7. Which of the following does NOT describe the following numbers: -2, -1, 0, 1, 2

8. What is the lowest common multiple of 6, 10 and 15 ?

9. Evaluate 5 + (6-2) x 4

10. What are the next two numbers in the following sequences? 1,4,9,____, _____