6.1.5 Greatest Common Factor

Today we learned about greatest common factor.  We discussed the way students had previously learned which involved listing out all of the factors and finding the largest that the two numbers had in common.  This way can be very time consuming and leads to mistakes if the factors are not listed correctly.  We learned how find the greatest common factor by using prime factorization.  By multiplying all of the common prime factors that two numbers have, you can find the greatest common factor.  Look at examples in the PowerPoint lesson from class today:

6.1.5 Greatest Common Factor Lesson

Today's HW - p. 148 #'s 37-44