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The Rules of Arithmecards

General A seven digit phone number is given to the player. The objective of the puzzle is to solve for the seventh digit using only addition, subtraction, division, and multiplication. The order of operations is strictly left to right (see example below). Answers that are computed involving fractions or divisions/multiplications by zero are not allowed. If the player solves the first phone number, a new number will be given, where the seventh digit is now at the front of the phone number. The player solves the puzzle when all seven digits in the phone number have been solved. Example If given the phone number:    168-4467 1 + 6 * 8 - 4 / 4 - 6 = 7 is a valid solution. 1 * 6 * 8 + 4 / 4 - 6 = 7 is also a valid solution.

Arithmecards For Your Website

If you own a website and would like to add Kevin Lawler's arithmecard puzzles on it, all you have to do is copy this one line of code somewhere in your website's html. If you would like to customize the size and border of the above puzzle widget, or if you have a personalized home page on iGoogle, Facebook, Microsoft Live, Pageflakes, Netvibes (and more!) and would like to add Razzle's puzzle widget to it, please visit the widget page.
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