Thread: Science Need help from the CP math whizzes
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Old 03-02-2013, 09:09 PM   #19
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Quote:
Originally Posted by Frosty View Post
Is there an explanation for it or it just a pattern to remember? The "10's " are trivial and I remembered the "9's" trick from school but explaining the pairs was trickier other than "it just is".
What trick? That any 2 digit number whose digits add up to 9 is also divisible by 9?
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