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Old 09-27-2007, 11:18 AM   #1
Default neat arithmetic trick
flybygrace
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This is neat!

To multiply any number between 1 and 9 by 9 hold both hands in front of your face - drop the finger that corresponds to the number you are multiplying (for example 9×3 - drop your third finger) - count the fingers before the dropped finger (in the case of 9×3 it is 2) then count the numbers after (in this case 7) - the answer is 27.
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Old 09-27-2007, 11:36 AM   #2
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Cool! I'll definitly be showing my kids that one.
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Old 09-27-2007, 11:51 AM   #3
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That's how I learned it 20 years ago....always been the easiest way to show kids how to multiply by nine.
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Old 09-27-2007, 11:57 AM   #4
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Hey! That IS cool!!
I always used to have to make two columns of numbers, the first starting with zero and going to 9, and then one next to it starting with 9 and going down to zero. This is MUCH easier! Thanks for sharing! Math was never my strong subject!! Still isn't!!
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