A Rolling Wave
Adding on to the post titled "Because Everything Is Backwards" a few more interesting characteristics to 13 leading to the #9 and a multiplication short-cut for the kids.
A curse placed on the #13..
Requirements of the curse...
2+7=9
Fun Math
Start with your pinky on your left hand, count over the number of fingers you wish to multiply the number nine by, this will give you the correct answer to any multiplication factor of the nine series. Let the finger that is placed down be the dividing finger when you are finding the sum of the multiplication problem.
Examples
1x9= Count the fingers. Are there nine?
2x9= 1 Finger=1 / 1 Finger down=0 Piont / 8 Fingers left=8 1 and 8 = 18
3x9= 2 7
4x9= 3 6
5x9= 4 5
6x9= 5 4
7x9= 6 3
8x9= 7 2
9x9= 8 1
9x10= Back to 9; Zero = nothing
It's a Forwards and Backwards thing.
1x9=9 90=9x10
2x9=18 81=9x9
3x9=27 72=9x8
4x9=36 63=9x7
5x9=45 54=9x6
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