6.NS.4 GCF and LCM

Warm Up What is a prime number? Give the first 10 prime numbers. What is a composite number? Give 3 examples. Is 1 a prime or a composite number?

It All Adds Up Work in table groups to complete the task provided. Discuss your method and apply a similar method to all 4 prizes. Good luck!

GCF Example: Find the GCF of 36 and 48: Greatest Common Factor: the greatest number that is a common factor of each of two or more numbers Two Methods: List and Prime Factorization Example: Find the GCF of 36 and 48: List Method Prime Factorization Method 36: 1, 2, 3, 4, 6, 9, 12, 18, 36 48: 1, 2, 4, 6, 8, 12, 24, 48 GCF is 12 36 48 12 3 2 24 4 3 2 12 2 3 2 2 3 2 3 4 2 2 3 2 2 2 GCF is 2x2x3 = 12

GCF Practice Find the GCF using the method prescribed: 27 and 36 List Method: Prime Factorization Method: 27 and 36 2) 160 and 550 8, 64 and 96 4) 30 and 48 20 and 24 6) 125, 40 Answers 9 3.

Warm Up Create a new addition problem by factoring out the GCF. 1. 80 + 110 2. 40 + 100 3. 64 + 8 + 120 4. 42 + 49 5. 66 + 72 6. 16 + 48