Beginning activities with numbers 

 - Frank Schaffer :  Rancho Palos Verdes,  c1980. 
 - 24 p. :  il. ;  28 cm 
<br/><br/><label>ISBN: </label>0867340142 
<br/><br/><label>Subjects--Index Terms: </label>Matemáticas-Enseñanza elemental