Wednesday Nov. 3,2011 You will need: – Book – Whiteboard – Notebook and Folder – Multiplication chart Start working on the Mental Math – Pg. 54 – # a-h.

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Presentation transcript:

Wednesday Nov. 3,2011 You will need: – Book – Whiteboard – Notebook and Folder – Multiplication chart Start working on the Mental Math – Pg. 54 – # a-h

Lesson 9 Prime Numbers

Counting numbers greater than 1 that have exactly two counting number factors: the number itself and 1.

Composite Numbers Counting numbers with more than two factors.

Prime Factorization Writing the number as a product of prime numbers. Use a factor tree or division to prime factorize a number. – 36 – 45

Tests of Divisibility One way to test if a number is prime or composite is to determine if it is divisible (can be divided) by a counting number other than 1 or itself. ConditionNumber is Divisible byExample using 3420 Even (ends in 2,4,6,8,0)23420 Sum is divisible by =9 and 9 can be divided by 3 Ends in 0 or

Practice Determine whether the numbers are prime or composite. a.526 b.305 c.123 d.1,237,526

Practice Use a factor tree to factorize these numbers: a.36 b.45 c.20 d.200

Practice Use division to factorize these numbers: a.16 b.40 c.50