That's What She Said Posted January 16, 2013 Share Posted January 16, 2013 This isn't really a trick, but is fascinating to me: Multiply any number by 9, then add the digits together. They will always equal 9, or a multiple thereof (18, 27, etc.) 9x2 = 18 ; 1+8 = 9 9x6 = 54 ; 5+4 = 9 9x17 = 153 ; 1+5+3 = 9 9x54 = 486 ; 4+8+6 = 18 9x238 = 2,142 ; 2+1+4+2 = 9 9x6,841 = 61,569 ; 6+1+5+6+9 = 27 9x483,902 = 4,355,118 ; 4+3+5+5+1+1+8 = 27 Link to comment Share on other sites More sharing options...
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