Mental Arithmetic in the Rachinsky School - Nikolay Bogdanov-Belsky - 1895 |
Via Starts with a Bang!
P.S. I made the superscript exponents using the html <sup> tag. I originally tried using the html code I found on mathoverflow, but the html was like four pages long and I couldn't make head or tails of it. PeggyK, a Platinum Product Expert, gave me a clue.
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