Greatest Common Factor

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Presentation transcript:

Greatest Common Factor using the cake method

What is the smallest prime number that goes into both 6 and 8? Now divide both 6 and 8 by the 2 GCF of 6 and 8 2 6 8 What is the smallest prime number that goes into both 3 and 4? 3 4 GCF: 2 Nothing? Then slash out bottom and multiply the numbers on the side to get the GCF. You will divide out any common prime factors of the two numbers

2 24 60 2 12 30 3 6 15 2 5 GCF GCF: 2x2x3=12 prime # that What’s the smallest prime number that goes into 24 and 60? Is there another prime # that goes into both 12 and 30? GCF 2 24 60 How about 6 and 15? 2 12 30 Anything else? 3 6 15 GCF: 2x2x3=12 2 5 No? Slash out the bottom. Then multiply the side.

pg. 164 examples b,c,d 12 66 18 30 32 48

pg. 166 practice #1,2 8 32 24 60

A gardener has 27 pansies and 36 daisies A gardener has 27 pansies and 36 daisies. He plants an equal number of each type of flower in each row. What is the greatest number of flowers per row? p. 167 #9

Homework: Solve the following problems in your math journal: Find the greatest common factor of: 15 and 40 16 and 36 12 and 54 24 and 64 39 and 26 35 and 63 36 and 48 35 and 28