Number Theory

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

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

3. What is a real number?

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

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

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

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

8. Calculate 3.3 x 2.5 + 5.7 x 2.5

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

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