Thread: The Nines
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Old 25-01-2011, 03:41 PM   #3
DarthHelmet86
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Join Date: May 2009
Location: Perth, Australia
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I always was taught and use the 10s method, if you will.

It is simple. You times the number by 10, then subtract one of itself from the result. I.e,

65x10=650-65=585

9x65=585
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