Schifter, Deborah <br/><br/>
Building a system of tens : developing mathematical ideas , number and operations, part 1 

 - New Jersey  Dale Seymour publications  1999 
 - 151 p 
<br/><br/><label>ISBN: </label>0769001696 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics