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 6 910

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

3018: 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 METHOD 11

Make a list of the first Make a list of the first few multiples of each few multiples of each number.number.

The smallest number on The smallest number on both (all) lists is the both (all) lists is the LCM.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

Solve the equation: x + 2/3 = 5 1/3

In the sixth grade band there are 5 trumpet players for every 3 flute players. If there are 24 flute players, how many trumpet players are there?

A designer used 36 feet of ribbon to trim 24 chairs. How much ribbon does the designer need to trim 6 more chairs?

Kevin has read 55% of a book. If there were 240 pages in the book, how many pages has he read?

Maria bought a shirt for $40, jeans for $55, and a purse for $19. The sales tax is 6%. What is the total cost including sales tax?

Of the 65 athletes at the state track finals, 10 were from Gwinnett County. About what percent of the athletes were not from Gwinnett County?

Of the 20 people Dylan invited to his party, 8 came wearing blue jeans. Write a proportion that would be used in determining the percentage of people who wore blue jeans?

Adam kept a table of his earnings for his summer job. Use the table to determine how much he was paid for working 17 hours.Hours worked Salary

2 $154 $306 $45

Jasmyn’s and Kristy’s mom baked a pizza. If Jasmyn ate 1/6 of the pizza and Kristy ate 2/5 of the pizza, how much did they eat together?

John, Sue, and their friends baked a giant cookie. John ate 5/18 of the cookie, Sue ate 1/3 of the cookie, and their friend, ate 2/9 of it. How much of the cookie was eaten?