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Tool: Diagonal Differences
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Go to: http://www.subtangent.com/maths/ig-diagdiff.php (opens a new window)
Description: This tool arranges the numbers 1 to 64 in an 8x8 grid, then outlines a 3x3 square within that grid. Multiply the diagonal corners, then take the difference of your results. Is that difference the same for any 3x3 square within this grid? What about different sizes of grid and square? Can you find a pattern?
Technology Type: Flash 
Author: Duncan Keith
Language: English 
Cost: Does not require payment for use

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