After the last day of school in June 2014, I attended a Mathemagics show by Dr. Benjamin of Harvey Mudd College. It was outstanding! He performed an half hour of mental math magic and then revealed some of his tricks during the second half hour. He supports doing mental from left to right (which is counter to how we teach/learn) and using auditory cues instead of visual cues when doing mental math. I purchased a series of his lectures and will share some of these joys of math with my students.
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