One of the things I love most about the #MTBoS is that for every idea I blog, I seem to get three or more ideas back in return. Recently, Christine Mishra left a comment on an old post from 2013 with a link to a (new-to-me) logic puzzle: Futoshiki. Christine thinks these would be awesome to include in a unit on inequalities, and I agree!

Here's the link she sent me to check out.

Each column and row can only contain a number once. And, all inequality symbols must be obeyed.

Here's a puzzle from the previous link. Clicking this puzzle will take you to the original source!

Doesn't this look fun???

Don't worry, there are smaller puzzles, too. They go down to a 4 x 4.

I asked my fiance if he had heard of these puzzles before, and we ended up spending a couple of hours skyping and trying to solve the same puzzles at the same time. Yeah, we know how to have fun. :)

If you're looking to try these out online, the best site we found was BrainBashers. It lets you make pencil marks which is a huge help in the problem solving process.

Anyone use these with students? Or have an idea of how to best use these? I'm thinking I'll give students one as a Figure It Out! Friday puzzle.

Wow! These are great -- thanks for making me discover them. You should do a post on Magic Squares, too (the greater-than equal signs were akin to the arrows used for direction in an odd magic square). Check this out: http://mathworld.wolfram.com/MagicSquare.html

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