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GCF and LCM

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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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