Number Theory

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

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

3. Calculate 3.3 x 2.5 + 5.7 x 2.5

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

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

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

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

8. What is a real number?

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

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