00322nam a22001217a 450000500170000000800410001702000180005804000240007605000210010024500220012130000230014352100340016620240314120830.0200114b           ||||| |||| 00| 0 eng d  a9781785782886  cHSLRC6HSLRCaHSLRC  aBF 575 P957 2017  a30-second maths /  a160 pages ; 24 cm.  aincludes appendices and index