1. Finding the Greatest Common Factor

2. The Greatest Common Factor (GCF) is:
November 13, 2018
The Greatest Common Factor (GCF) is:
The largest factor shared by two or more products

3. First, lets review how to find factors:
November 13, 2018
First, lets review how to find factors:
You can list all factors in a “rainbow”
You can use a factor tree

4. November 13, 2018
To determine the GCF, list all factors of the product in least to greatest order.
Product is 12: 1, 2, 3, 4, 6, 12
Product is 20: 1, 2, 4, 5, 10, 20

5. November 13, 2018
Next, identify any factors that the numbers share-these are called Common Factors
Product is 12: 1, 2, 3, 4, 6, 12
Product is 20: 1, 2, 4, 5, 10, 20

6. The largest number that the factors share is the GCF:
November 13, 2018
The largest number that the factors share is the GCF:
The Greatest Common Factor for the products 12 and 20 is:
Product is 12: 1, 2, 3, 4, 6, 12
Product is 20: 1, 2, 4, 5, 10, 20

7. To find the GCF using prime factorization-compare the prime numbers
November 13, 2018
To find the GCF using prime factorization-compare the prime numbers

8. Then multiply common factors to get GCF:
November 13, 2018
Then multiply common factors to get GCF:

9. November 13, 2018
Find the GCF:
2, 3, 3
2x3x3=18

10. Now its your turn to practice!