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GCF and LCM

GCF and LCM. Molly Jasmine Felicia Addie. Starting out with GCF. You have two whole numbers Next you find two or more factors for each of them with a factor tree until there are only prime numbers Then circle the prime numbers Now make a Venn diagram

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GCF and LCM

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  1. GCF and LCM Molly Jasmine Felicia Addie

  2. Starting out with GCF • You have two whole numbers • Next you find two or more factors for each of them with a factor tree until there are only prime numbers • Then circle the prime numbers • Now make a Venn diagram • Put the original numbers that are on the top of the factor trees on the two end sides of the Venn diagram • Put the common factors (the prime numbers that are the same in both factor trees) in the middle of the Venn diagram • Then put the remaining prime numbers in the other two parts of the Venn diagram • Multiply all the common factors together to get the GCF, if there are no common factors then the GCF= 1

  3. Now to LCM • Take all the numbers in the Venn diagram and multiply them together • The number that you get is the LCM

  4. Example: Website: http://nlvm.usu.edu Link: http://nlvm.usu.edu/en/nav/frames_asid_202_g_3_t_1.html?from=category_g_3_t_1.html

  5. http://nlvm.usu.edu Creating the factor trees Finding the GCF and LCM

  6. Thanks!! • Molly, Jasmine, Felicia, and Addie, hoped you enjoyed our presentation on GCF and LCM

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