00326nam a2200121Ia 450000500170000000800410001704100080005808200150006610000190008124500470010026000480014730000090019520260720174542.0260720s2005    xx            000 0 und d  aeng  a510.7 EDIT  aEdiger, Marlow  aTeaching mathematics in elementary schools  aNew DelhibDiscovery Publishing Housec2005  a200p