At this the MathFest (Washington DC 2015) lecture by Richard Guy and John Conway I learned of a book from 1912. Probably only of interest to math geeks. (yep math geek alert) I find it interesting that this reference book begins with the divisibility test for 9 and for 11 and the usefulness of knowing that 1/8 is .125
https://books.google.com/books?id=Ad3uAAAAMAAJ&pg=PP1#v=onepage&q&f=false
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