Greatest Common Factor - Teachers.Henrico Webserver

Greatest Common Factor - Teachers.Henrico Webserver

Objectives The student will be able to: 1. find the prime factorization of a number. 2. find the greatest common factor (GCF) for a set of monomials. SOL: A.2c Designed by Skip Tyler, Varina High School A prime number is a number that can only be divided by

only one and itself. A composite number is a number greater than one that is not prime. Prime or composite? 37 prime 51 composite Prime or Composite? 89

1. 2. 3. 4. Prime Composite Both Neither 1) Find the prime factorization of 84.

84 = 4 21 = 2237 = 22 3 7 2) Find the prime factorization of -210. -210 = -1 210 = -1 30 7 = -1 6 5 7 = -1 2 3 5 7 3) Find the prime factorization of 45a2b3

45a2b3 = 95aabbb = 335aabbb = 32 5 a a b b b Write the variables without exponents. What is the prime factorization of 48? 1. 2. 3.

4. 3 16 344 2234 22223 The Greatest Common Factor (GCF) of 2 or more numbers is the largest number that can divide into all of the numbers.

4) Find the GCF of 42 and 60. Write the prime factorization of each number. 4) Find the GCF of 42 and 60. 42 = 60 = 2 3 7 2235

What prime factors do the numbers have in common? Multiply those numbers. The GCF is 2 3 = 6 6 is the largest number that can go into 42 and 60! 5) Find the GCF of 40a2b and 48ab4. 40a2b = 2 2 2 5 aab 48ab4 = 2 2 2 2 3 a b b b b

What do they have in common? Multiply the factors together. GCF = 8ab What is the GCF of 48 and 64? 1. 2. 3. 4. 2

4 8 16

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