Greatest Common Factor

Assignment: 08-Greatest Common Factor
Practice 1: 10-GCF LCM Practice
Practice 2: 11-GCF LCM Practice

Greatest Common Factor, or GCF, is exactly what it sounds like it should be.  Greatest, meaning largest, common, meaning same, and factor being a number that divides into another, the GCF will be the largest factor that two numbers have in common.  Take the numbers 12 and 20.  There are two different ways  we can find the greatest common factor.  The first would be by listing all the factors for the smaller number, and circling the ones that are the same as the larger.

gcf1

The other way is pictured below.  I like to call it the Cake Method. The steps  are explained around it.

gcf2

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