Tool: 9 digits 


Go to:  http://play.google.com/store/apps/details (opens a new window)  
Description:  This is a puzzle with 9! possibilities and 336 solutions. The problem posed in 9 digits consists in the organization of the numbers 1 to 9 in a square of 3 * 3 to make the sum of the numbers of the first two rows equal to the bottom row.
This app is aimed at reflecting on the addition and commutative property of addition. Online version: http://mathcats.com/explore/ninedigits/ninedigitsbasic.html 

Technology Type:  Android  
Guide:  User's Guide (opens a new window)  
Author:  Wendy Petti & Maurici Carbo  
Language:  English  
Cost:  Does not require payment for use  
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Courses:  Math 2  Addition  
Math 3  Addition, Mental math  
Math 4  Addition, Mental math  
Math 5  Addition, Mental math, Commutative  
Math 6  Addition, Mental math, Commutative  
Math 7  Mental math, Commutative  
