Outline Mathematics Number Theory Simple division by 7 Here's a problem to tackle:   Peter glanced at the boy figuring. "Just a regular four-digit number," he said. "What's so very special about it? "Look, dad," Stan replied. "To divide it by seven you only have to drop its second digit." He was right, so what was the number? Solution Copyright © 1996-2008 Alexander Bogomolny                             Solution   Peter glanced at the boy figuring. "Just a regular four-digit number," he said. "What's so very special about it? "Look, dad," Stan replied. "To divide it by seven you only have to drop its second digit." He was right, so what was the number? (In the applet below, click on the underlined omitted expressions. See what happens.) // formulations This applet requires Sun's Java VM 2 which your browser may perceive as a popup. Which it is not. If you want to see the applet work, visit Sun's website at http://www.java.com/en/download/index.jsp, download and install Java VM and enjoy the applet. Do not forget to check your solution. References J. A. H. Hunter, Entertaining Mathematical Teasers, Dover Publications, 1983 Copyright © 1996-2008 Alexander Bogomolny

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