Material Detail

The problem proposed by ninedigits is to reorder the numbers from 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 program is aimed at reflecting on the addition. The goal is to find results that meet the primary condition. We must be aware that after obtaining a correct result can be achieved more easily results having in mind the properties of the sum.

Ninedigits has 336 solutions. If the program could become be easy for some, then the goal would be to find valid solutions in which a lady could travel chess box containing 1 to 9 doing right moves in this chess game piece. According to our analysis, there are three solutions of this type. You can also find the solution, following the same conditions, but with the tower of chess: This combination of conditions is only one solution. The program displays graphically the fact that having these special results.

For to switch the numbers between them, you can click on two squares, and they become exchanged. You can also drag a number of other to swap them.

There's a version for Android 2.2 and up in the mirror site.

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