Reddit reviews Number Freak: From 1 to 200- The Hidden Language of Numbers Revealed
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Number Freak: From 1 to 200- The Hidden Language of Numbers Revealed
A Mathematician's Lament: How School Cheats Us Out of Our Most Fascinating and Imaginative Art Form
Arithmetricks: 50 Easy Ways to Add, Subtract, Multiply, and Divide Without a Calculator (Hey, you said light!)
I swear all the really well written general books on math were written before 1980! Check out Mathematics, Its Magic and Mastery.
Dang it, I searched for it a long time ago. That would make sense. I found it when reading the book. After searching some terms, here is the book:
https://www.amazon.com/Number-Freak-Language-Numbers-Revealed/dp/0399534598
It never mentions them directly, but iirc on number 50 the subtitle below the number contained 50 = (10-5)(10-0)