00273nam a22000977a 450000500170000000800410001702000230005808200170008110000190009824500580011720250803105800.0250803b        |||||||| |||| 00| 0 eng d  a9780205343270qpbk  a510.712bKRU  aStephen Krulik  aTeaching Mathematics In Middle SchoolcStephen Krulik