TY - BOOK AU - Hasanabba B A TI - Recreational Mathematics Methods of Mental Mathematics (Vedic, trachtenberg and other Systems) SN - 9788172869076 U1 - 510 HAS PY - 2015/// CY - Bengaluru PB - Prism Books Pvt. Ltd. KW - hasanabba b a KW - mathematics KW - recreational KW - mental ER -