https://bineeshthomas.wordpress.com/2012/04/13/sutra-5-shoonya-samyasamu...
http://mathlearners.com/vedic-mathematics/multiplication-in-vedic-mathem...
http://www.ilovemaths.com/vedicmaths.asp
http://w3facility.org/question/urdhva-tiryak-sutra-for-division/
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