How ancient Egyptians multiplied numbers
An Incredibly Easy Way To Divide Numbers – Ancient Math Secret You Didn’t Learn In School
The problem 30 divided by 2 1/2 is documented in the Rind Mathematical Papyrus, Problem 76. The document is from ~1650 BC, which is more than 3,600 years ago.
http://en.wikipedia.org/wiki/Rhind_Mathematical_Papyrus
“The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook”
Partial quotients method (pdf): http://everydaymath.uchicago.edu/teaching-topics/computation/documents/div-partial-quotients-ex-1.pdf
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