Amazing visual aids for directed numbers  Amazing demonstration of addition  and multiplication rules with magical "T&M" models 

 - Colombo  Tissa Senanayaka  2012 
 - [8],38 p. 
<br/><br/><label>ISBN: </label>9780980461305 
<br/><br/><label>Subjects--Topical Terms: </label><br/>DANCE TECHNIQUE<br/>LITERATURE<br/>WETLAND<br/>Environment Science
<br/><br/><label>Dewey Class. No.: </label>B0261  / LDC