Think of a number in the range 1 to 31. Click on all the Cards that has your chosen number on it. Once done, click on the "Show Number" button. Can you figure out the math behind this Magic Trick?

16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31

08, 09, 10, 11, 12, 13, 14, 15, 24, 25, 26, 27, 28, 29, 30, 31

04, 05, 06, 07, 12, 13, 14, 15, 20, 21, 22, 23, 28, 29, 30, 31

02, 03, 06, 07, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31

01, 03, 05, 07, 09, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31


         

                   

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