1. 6.NS.4
GCF and LCM

2. 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?

3. 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!

4. 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
GCF is 2x2x3 = 12

5. 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.

6. Warm Up Create a new addition problem by factoring out the GCF.