SWBAT find the prime factorization of a number.

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Prime Factorization Notes 9/25/09

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Presentation transcript:

SWBAT find the prime factorization of a number.

Warm Up Solve: 11 + 4 x 32 - (6 + 5 x 2) Solve: 2394 ÷ 17 Write (⅖)4 in expanded form.

Vocab What is a prime number? What does it mean to “factor” Prime Factorization: Finding which prime numbers multiply together to equal a particular number We factor these prime numbers out using a factor ladder, or we can use a factor tree

Rules Each number only has ONE prime factorization. Since 1 is neither prime nor composite, we do not use 1 in our factor string List the numbers from LEAST to GREATEST Numbers that occur more than once can be shown using exponents

Example Prime factorization of 24

Your Turn! Find the prime factorization of each of the following: 81 2. 35 3. 70 4. 42 5. 75 Make sure your factor string is listed from least to greatest and using exponents when possible.

Exit Ticket What is a prime number? Find the prime factorization of 60. Describe what we learned today, in your own words, to a student who was absent.