Thread: Science Need help from the CP math whizzes
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Old 08-31-2013, 08:47 PM   #48
cdcox cdcox is offline
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Quote:
Originally Posted by Frosty View Post
This is 7th grade level, so they should be able to, once they figure out that 223 is prime.
Yeah, the factoring of 2007 is the hard part. If they guess it is divisible by 3, you get 669, which is clearly divisible by 3. Then they just have to go with their gut that 223 is prime.

It is pretty easy to see that 223 isn't divisible by 2, 3, 5, 7, or 11, so guessing that it is prime is pretty safe at that point.
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