For Our Mathematical
Jim Henle

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Spring 2018: Meaning to Please Last year in my other column I introduced a numeration system using circles and dots. The system is now animated and you can see it and play with it here. The multiplication is especially cool.
Summer 2018: The Entertainer
Fall 2018: Puzzle Ninja Ninja
Winter 2018: Baseball Retrograde Analysis There are some errors in the column. You can download a corrected version here.
Scorecard You can download this. It's useful in solving and creating puzzles.