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Divisibility Rules to 50 and Beyond

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Visit this site: http://mathforum.org/dr.math/faq/faq.divisibleto50.html
Author:Stephen D.T. Froggatt; Math Forum, Ask Dr. Math FAQ
Description: A quick way of testing primality of larger numbers: the idea of deleting the last digit and adding or subtracting a multiple of the digit from the remaining number can be generalized to test for divisibility by prime numbers up to 50 and beyond.
Levels: Elementary, Middle School (6-8), High School (9-12)
Languages: English
Resource Types: Frequently Asked Questions (FAQs)
Math Topics: Division, Prime Numbers

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