Arithmetic Teacher 31 

 - Philadelphia  NCTM  Mai. 1984 
 - 44 
 - 20091211 
 - Arithmetic Teacher  31 .
<br/><br/><label>ISSN: </label>1679-656X 
<br/><br/><label>Dewey Class. No.: </label>AMT 2009  / 2009