Gaytero, Reynaldo B. <br/><br/>Powerful mathematics shortcuts and techniques in multiplication :  30 techniques for all levels and for all times / Reynaldo B. Gaytero.--  -- [S.l. : s.n.].  1996.  <br/>167 p. ;  22 cm. <br/><br/><label>ISBN: </label>9719195001 <br/><br/><label>Subjects--Topical Terms: </label><br/>Mulitpication-Study and teaching.<br/>Mathematics-Study and teaching. <br/><br/><label>Dewey Class. No.: </label>Fil 512.21307 G257 1996