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Friday, September 7, 2012

Divisibility and Prime and Composite numbers

We spent a little time working on more divisibility rules and I introduced the rules for 6 and 9 for a bit of a challenge/extension.

6:  A number is divisible by 6 if it is divisible by both 2 and 3.

9:  A number is divisible by 9 if the sum of its digits is divisible by 9.

After that, we started talking about Prime and Composite numbers.

Some notes from class about prime and composite numbers:

Eratosthenes' sieve  <- Click this link to complete the Sieve of Eratosthenes!

And, the song...  That song......

Homework is to Enjoy your weekend!  See you on Monday!!!!

As a quick reminder, if you forgot to bring in your field trip paperwork, make sure it comes in on Monday!!!

-Miss K  :)

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