00593nam a2200157 a 450000500170000000800410001702000180005805000270007624500910010326000460019430000170024065000400025765000130029799900190031095201060032920140412111235.0001110s19uu    xx            00    eng d  a0-88336-811-0  aTR(GS 510.7bAd21 1981  aAdding whole numbers :blevel one: book 2 breaktrough math /cedited by Ann K. Tusing.  aSyracuse, NY :bNew Readers Press,c1978.  a64 p. ; ill.  aMathematics - - study and teachings  aaddition  c102409d102409  001040aELbELcTRd2000-11-10l0oTR(GS 510.7 Ad21 1981pE1624r2014-04-12 00:00:00w2014-04-12yBK