Numeros racionales / 
National council of teachers of mathematics ; traduccion de Federico Galván Anaya 
 - 87 páginas 
<br/><br/> Traduccion de : topics in mathematics for elementary school teachers 
<br/><br/><label>ISBN: </label>968-24-0098-8 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Aritmética--Fundamentos
<br/><br/><label>LC Class. No.: </label>QA248.3  / N3718