Divisibility Rules to 50 and Beyond
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|Stephen D.T. Froggatt; Math Forum, Ask Dr. Math FAQ|
|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)|
|Resource Types:||Frequently Asked Questions (FAQs)|
|Math Topics:||Division, Prime Numbers|
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