4-1+GCF



Main Idea: Find the greatest common factor of two or more numbers.

Identify Common Factors

The Factor Game - this game will give you practice identifying factors. This is a game to play with a partner.

There are two ways to find the greatest common factors of numbers. Watch the videos below for Listing Factors and the three methods for Using Prime Factors. You will be expected to know how to find the GCF using both styles. As far as the best method for finding prime factors you can choose which of the three methods works best for you.

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Method 1: Factor Trees media type="custom" key="12193178" align="center"

Method 2: Birthday Cake media type="custom" key="12193194" align="center"

Method 3: Venn Diagrams media type="custom" key="12193206" align="center"

 Greatest Common Factor - Factors that are shared by two or more numbers are called common factors. The greatest of the common factors of two or more numbers is the greatest common factor (GCF) of the numbers. Venn Diagram - Overlapping circles used to show common elements.
 * Factor Tree - factor one tree at a time until you feel comfortable with factor trees. Then choose 2 trees. You'll be given a Venn diagram when you finish factoring two trees. Drag the factors into the correct area of the Venn diagram. To find the LCM, multiply all the numbers in the Venn diagram.
 * AAAMath - read the study guide then scroll down and practice identifying the greatest common factor of given numbers.

Grab a deck of cards and play the card game, "Be a Factor." media type="custom" key="21425180"