[wsj-responsive-image P="//si.wsj.net/public/resources/images/BN-PV341_MATH_P_20160914161420.jpg" J="//si.wsj.net/public/resources/images/BN-PV341_MATH_J_20160914161420.jpg" M="//si.wsj.net/public/resources/images/BN-PV341_MATH_M_20160914161420.jpg" caption="" credit="LUCI GUTIÉRREZ" placement="Inline" suppressEnlarge="false" ] When Coach Newton announces that the first practice of the year will be on fractions, the students complain, “Awww! We’re way beyond that!” “Don’t worry,” consoles the coach, “these fractions come from the third dimension.” Hexadiagonal Yoshi is idly drawing diagonals on the faces of a […]