A prime number is a whole number greater than 1 that is only divisible by 1 and itself. Examples of prime numbers are 2, 3, 5. A composite number is a whole number that has more than two factors. Examples of composite numbers are 4, 6, 9. The divisibility rules for 3, 4, 6, 9, 10 are: a number is divisible by 3 if the sum of its digits is divisible by 3; a number is divisible by 4 if the last two digits are divisible by 4; a number is divisible by 6 if it is divisible by both 2 and 3; a number is divisible by 9 if the sum of its digits is divisible by 9; a number is divisible by 10 if

1. Interim Review12/16/09

2. What is the difference between a prime number and a composite number? Give 3 examples of each.

3. What is the divisibility rule for the following numbers… 3 45 6 9 10

4. What is prime factorization? Write the prime factorization of each of the following numbers… 36 54 99

5. Define FACTORS: whole numbers that are multiplied to find a product (answer)For example: 2x3=6… therefore 2 and 3 are factors of 6

6. What does Greatest Common Factor mean?

7. The greatest common factor of two or more numbers is the greatest number that is a factor of every number

8. Find the GCF of 18 and 36

9. 1. Make a list to find the GCF of 18 and 3018: 1, 2, 3, 6, 9, 1830: 1, 2, 3, 5, 6, 10, 15, 30THE GCF of 18 and 30 is 6.

10. What does Least Common Multiple mean?

11. A Multiple of a number is the product of that number and a nonzero whole number.2 x 1 = 22 x 2 = 42 x 3 = 62, 4, 6 are multiples of 2.

12. Find the LCM of:12 and 24

13. METHOD 1Make a list of the first few multiples of each number.The smallest number on both (all) lists is the LCM.12 – 12, 24, 36, 48, 6024 – 24, 48, 72, 96, 120

14. What is the difference between an improper fraction and a mixed number?GIVE 3 EXAMPLES OF EACH

15. How can I add and subtract fractions with like denominators?

16. What does Least Common Denominator mean?What do you need to add and subtract fractions?

17. How do you regroup mixed numbers for subtraction?6 and 5/12 – 2 and 7/12=7 and 2/3 – 2 and 5/6 =

18. How do you multiply fractions?

19. How do you divide fractions?

20. What is a ratio?Write 3 equivalent ratios to ⅖

21. Solve the following proportions… 6/14 = A/7 5/A = 7/77

22. What is a percent?Write the following percentages as fractions in simplest form… 25% 45% 90%

23. How do I change a percent to a decimal?Change the following percents to decimals…7% 22% 60% 70.4%

24. How do I change a decimal to a percent?Change the following decimals to percents….18 .008 .2 .143