I came across Arthur Benjamin’s course:
Great resource, thanks Kinma!
Unfortunately, lessons 1-10 have been taken offline by now.
I just looked up the course and it’s available online at the link below. The current price for the audio is USD $17.95. The video version is $24.95.
https://www.thegreatcourses.com/courses/secrets-of-mental-math.html
unfortunately, the link was banned…
Book can be bought for about $10 on new or $2 used.
I suggest do that.
Links in this thread are indeed dead by now.
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If you don’t want to spend money but want to immediately dive in, search his name on Youtube. In a lot of his videos he explains what he does.
This is also a good starting point:
Found it again:
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I just saw this: “No Calculator? No Problem! Mastering Mental Math” by Arthur Benjamin. It says that the release date is September 17, 2019 (today)
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Art has been on the Board of the Backgammon Federation and has posted some nice tricks for adding in Backgammon if you like that kind of thing.
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http://www.mathematicalmagic.com/docs/mathsmagic_full.pdf full of math based magic tricks