FROM THE FILEAuthor(s): Gary NelsonSource: The Arithmetic Teacher, Vol. 41, No. 8 (APRIL 1994), p. 482Published by: National Council of Teachers of MathematicsStable URL: http://www.jstor.org/stable/41196058 .

Accessed: 16/06/2014 22:39

Your use of the JSTOR archive indicates your acceptance of the Terms & Conditions of Use, available at .http://www.jstor.org/page/info/about/policies/terms.jsp

.JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range ofcontent in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new formsof scholarship. For more information about JSTOR, please contact support@jstor.org.

.

National Council of Teachers of Mathematics is collaborating with JSTOR to digitize, preserve and extendaccess to The Arithmetic Teacher.

http://www.jstor.org

This content downloaded from 62.122.73.34 on Mon, 16 Jun 2014 22:39:17 PMAll use subject to JSTOR Terms and Conditions

FROM THE FILE

Build a personal collection by reproducing this "From the File" on card stock and adding it to From the File Treasury, a collec- tion edited by Jean M. Shaw and packaged in a colorful plas- tic file box with room to add

your own favorites (1 991 , stock # 476, $22.50; 20% discount for individual members; see the NCTM Membership Application and Order Form in this issue).

/ Computation

WIPEOUT II- A CALCULATOR GAME

This game gives practice with the calculator, reinforces number sense, and promotes problem-solving skills.

To play the game, each pair of students needs a calculator. The first player enters seven digits of a telephone number, for example, 9 2 6 0 4 4 5.

The second player selects one of the digits in the display and repeats it as often as desired to produce a number that is subtracted from the original number.

Players take turns. The first player to wipe out the telephone number, leaving only 0 displayed, is the winner.

Sample turns Calculator display

Player 1 enters 0 И И 0 H H В | 9 2 6 0 4 4 5] Player 2 enters 000000000 1 7 0 3 8 2 2 3^ Player 1 enters 0Щ000000 [ 6 1 493 3~5~] Player 2 enters 00000 | 6 1 4 9 0 0~2~]

Play continues until a winner is determined. Note: Initially, if a negative number appears in the display, the other player wins and a new game

is begun. Later on this rule can be modified to allow a player to add, rather than subtract, a number formed by repeating a digit from the display.

From the file of Gary Nelson, Kennesaw State College, Marietta, GA 30061

482 ARITHMETIC TEACHER

This content downloaded from 62.122.73.34 on Mon, 16 Jun 2014 22:39:17 PMAll use subject to JSTOR Terms and Conditions