Thursday, October 8, 2009

Multiples of nine





To know if a number is a multiple of nine you must add up all the digits and if the sum equals three or nine the whole number is, But if the sum equals a two or more digit number you add those up to get a sum of 3 or nine.
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1 comment:

  1. Ms. StottOctober 18, 2009 at 8:22 PM

    I did not know the mathematical "secret" you taught today in class. I am going to show your lesson to my Math 12 class. They will be impressed!

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