Prime Numbers and Prime Factorizations

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Ms. Bobbi Casper

A Prime number is a whole number that has exactly two factors, 1 and the number itself. Examples: 11, 13,

23

PRACTICE QUESTION

Determine whether each number is Prime.1. 292. 393. 47

• Now click here to go to the “Find the Prime Factors of a Number” web site. Double check your answers to make sure they are correct. When you are finished return to this page to advance to the next page.

A composite number is a number greater than 1 with more than two factors. Examples: 6, 10,

18

• QUESTIONDetermine if each number is prime or composite.

1. 27

2. 19

3. 49

Next click here to go to E-lab, Prime and

Composite Numbers. Scroll down the page to the

blue box. Click on Find Factors to check your

answers above. When you are finished return to

this page to advance to the next page.

Neither prime nor composite numbers are:

• 1 - because it has only one factor,

and

• 0 - because 0 has an infinite number of factors.

CLICK HERE

Prime Factorizations using Factor Trees

• Now that you are familiar with prime and composite numbers CLICK on the web site below to learn about Factor Trees.

• When you are finished on the web return to this page to advance to the next page.

Practice Factor Trees

• QUESTION 1

• Find the prime factorization of 54.

• A. 2x2x3x3

• B. 2x3x3x4

• C. 2x2x2x3

• D. 2x3x3x3

Question 1

• I’m sorry. Your answer is incorrect.

Please return to the question and

try again. CLICK HERE TO TRY AGAIN.

CONGRATULATIONS!!!!!!

• You are correct!! The Prime factors of 54 are 2x3x3x3.

CLICK HERE TO CONTINUE.

Practice Factor Trees

• QUESTION 2

• Find the prime factorization of 36.

• A. 2x2x3x3

• B. 2x3x3x3

• C. 2x2x2x3

• D. 2x2x3x4

CONGRATULATIONS!!!!!!

• You are correct!! The Prime factors of 36 are 2x2x3x3.

CLICK HERE TO CONTINUE.

Questions 2

• I’m sorry. Your answer is incorrect.

Please return to the question and

try again.•CLICK HERE TO TRY AGAIN.

Practice Factor Trees

• QUESTION 3

• Find the prime factorization of 57.

• A. 3x5x7

• B. 2x3x4

• C. 3x15

• D. 3x19

Question 3

• I’m sorry. Your answer is incorrect.

Please return to the question and

try again.•CLICK HERE TO TRY AGAIN.

CONGRATULATIONS!!!!!!

• You are correct!! The Prime factors of 57 are 3x19.

CLICK HERE TO CONTINUE.

Practice Factor Trees

• QUESTION 4

• Find the prime factorization of 30.

• A. 2x2x3x5

• B. 2x3x4x5

• C. 2x3x5

• D. 2x4x5

CONGRATULATIONS!!!!!!

• You are correct!! The Prime factors of 30 are 2x3x5.

CLICK HERE TO CONTINUE.

• I’m sorry. Your answer is incorrect.

Please return to the question and

try again.• CLICK HERE TO

TRY AGAIN.

Practice Factor Trees

• QUESTION 5

• Find the prime factorization of 48.

• A. 2x2x3x4• B. 2x2x2x3• C. 2x2x2x5• D. 2x2x2x2x3

CONGRATULATIONS!!!!!!

• You are correct!! The Prime factors of 48 are 2x2x2x2x3.

CLICK HERE TO CONTINUE.

• I’m sorry. Your answer is incorrect.

Please return to the question and

try again.•CLICK HERE TO TRY AGAIN.

You have completed this session.

• Please remember to return to these web sites in the future to continue to improve your skills in determining prime numbers, composite numbers and factor trees.

• Click here to finish this session.