Interim Review

12/16/09

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

What is the divisibility rule for the following numbers…

2 3 4

5 6 9 10

What is prime factorization? Write the prime factorization of each of the following numbers…

36 54 99

–Define FACTORS: whole numbers that are multiplied to find a product (answer)

–For example: 2x3=6… therefore 2 and 3 are factors of 6

What does Greatest Common Factor mean?

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

Find the GCF of 18 and 36

1. Make a list to find the

GCF of 18 and 30

18: 1, 2, 3, 6, 9, 18

30: 1, 2, 3, 5, 6, 10, 15, 30

THE GCF of 18 and 30 is 6.

What does Least Common Multiple mean?

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 = 6

2, 4, 6 are multiples of 2.

Find the LCM of:

12 and 24

METHOD 1

Make 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, 60

24 – 24, 48, 72, 96, 120

What is the difference between an improper fraction and a mixed

number?

GIVE 3 EXAMPLES OF EACH

How can I add and subtract fractions with like denominators?

What does Least Common Denominator mean?

What do you need to add and subtract fractions?

How do you regroup mixed numbers for subtraction?

• 6 and 5/12 – 2 and 7/12=

• 7 and 2/3 – 2 and 5/6 =

How do you multiply fractions?

How do you divide fractions?

What is a ratio?

Write 3 equivalent ratios to ⅖

Solve the following proportions…

6/14 = A/7 5/A = 7/77

What is a percent?

Write the following percentages as fractions in simplest form… 25% 45% 90%

How do I change a percent to a decimal?

Change the following percents to decimals…

7% 22% 60% 70.4%

How do I change a decimal to a percent?

Change the following decimals to percents…

.18 .008 .2 .143