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GrapefruitGecko

MegaFavNumbers: 80,846,126
Fran is trying to choose a number larger than a million to be her new favorite number. Now she wants to know if there is anything special about it.
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Why does the 9's trick work???
After explaining why divisibility rules for the factors 3 and 9 work, Fran shows how easy it is to create a divisibility rule of any factor.
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