Last year I posted about a puzzle equivalent to factoring a quadratic equation:

(Solid lines mean multiply, dotted lines mean add.)

Josh Giesbrecht has produced some lovely full sheets worth of these puzzles.

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Filed under: Education, Mathematics, Puzzles

Tyler, on February 11, 2010 at 10:16 am said:We did these in middle school! I thought they were pretty cool. But they were formatted in a “honeycomb” shape. Or, now that I’m all growed up, I suppose I should say a tesselated hexagon pattern. But I don’t remember exactly which numbers went in which hexagon. Anyone know what I’m talking about?

Tyler, on February 11, 2010 at 10:23 am said:Of course, right after posting, I figured it out. The 17 would go in the middle and it’s surrounded by six empty cells. Then, on the sides, attached to the two left squares and the two right squares, are the 6 and the 12. When moving horizontally toward the center, factor (or equivalently, when moving horizontally outward, multiply). When moving vertically toward the center, add. I hope this makes sense.

joshg, on February 11, 2010 at 7:48 pm said:Hint taken, PDFs added!