Torres, Rodolfo C. <br/><br/>
Subtraction made easy / 
Rodolfo C. Torres 
 - 40 pages :  illustrations ;  cm 
<br/><br/> Primary 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subtraction<br/>Arithmetic
<br/><br/><label>Dewey Class. No.: </label>513.212