Thursday
July 31, 2014

Homework Help: Math

Posted by Kara on Sunday, October 4, 2009 at 7:10pm.

A number magician tells you: : Pick any positive integer and multiply it by 18. Delete one of the non-zero digits of the product. Tell me the sum of the remaining digits of the product and I will tell you what digit you deleted." Explain this trick.

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