Divisibility Rules and the Sieve of Eratosthenes

The Multiplication Rectangles worksheet left off at trying to find all of the factors of 72.  As numbers get bigger, it can be more difficult to find all of the factors of the number. 

There are a couple of useful tools to make this task easier. 

 

This activity blends an activity known as the Sieve of Eratosthenes with exploring divisibility rules.

 

 

 

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Key - Sieve Of Eratosthenes And Divisibility Rules