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ERIC Number: EJ900048
Record Type: Journal
Publication Date: 2007-Sep
Pages: 5
Abstractor: As Provided
Reference Count: N/A
ISSN: ISSN-0746-8342
The Number Pad Game
Fink, Alex; Guy, Richard
College Mathematics Journal, v38 n4 p260-264 Sep 2007
In this article, we explore the game based on the following problem from the 1st Mathematical Olympiad of Central America and the Caribbean, held in Costa Rica in 1999: Player A turns on the calculator, presses a digit key and then presses the + key. A second later, player B presses a digit key in the same row or column of the last digit key pressed by A, then presses the + key. The game proceeds with the two players taking turns alternately. The first player who reaches a sum greater than 30 loses. Which player has a winning strategy? Describe the strategy.
Mathematical Association of America. 1529 Eighteenth Street NW, Washington, DC 20036. Tel: 800-741-9415; Tel: 202-387-5200; Fax: 202-387-1208; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Costa Rica