Primes & Composites, GCF
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Primes & Composites, GCF

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Primes & Composites, GCF Primes & Composites, GCF Presentation Transcript

  • Agenda Tuesday, Nov. 10 homework 3 p. 193 #2 - 20, 25 - 28 Do Now Write using exponents 1. 3 * x * y * x 3x 2 y 2. a * b * a * b * b * -2 -2a 2 b 3 3. Evaluate: 4x 2 + 3 for x = -5 4(-5) 2 + 3 4 * 25 + 3 100 + 3 = 103 Correct homework 4-3 Prime Factorization & Greatest Common Factor Daily Scribe -
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  • A Prime number can only be divided evenly by itself AND one. One is not a prime because it can ONLY be divided evenly by one.
  • Are these number Prime or Composite?
  • Prime factorization - a composite number written as the product of it's prime factors Divide by prime numbers beginning with 2. Gather the primes and put in exponential form. 2*3*3 2*3 2 18 2 9 3 3
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  • How Do You Find the Greatest Common Factor (GCF) Using Prime Factorization?
  • Prime Factors of 20 Prime Factors of 12 Greatest Common Factor (GCF) 1) Which numbers are in both circles? 2, 2 2) Find the product of the numbers that are in both circles. 4
  • Prime Factors of 20 Prime Factors of 12 20 = 2 x 2 x 5 12 = 2 x 2 x 3 3 2 2 5 The Greatest Common Factor (GCF) is the product of the common prime factors. The GCF of 12 and 20 is 4. Move the rectangle to check your answer.
  • Prime Factors of 28 Prime Factors of 16 28 = 2 x 2 x 7 16 = 2 x 2 x 2 x 2 Directions: Find the prime factorization of each number. Use the Venn diagram below to show the prime factors of 16 and 28. Then use it to find the GCF.
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