http://speedmath.blogspot.com/2013/03/paravartya-yojayet.html
https://bineeshthomas.wordpress.com/2011/05/25/sutra-4-paraavartya-yojay...
http://mathlearners.com/vedic-mathematics/division-in-vedic-mathematics/...
http://blogannath.blogspot.in/2009/09/vedic-mathematics-lesson-18-divisi...
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