Learning subtraction. 

 - Princeton, NJ :  Video Tutor,  1993. 
 -  1 videodisc (VCD) ( 60 min) : sd., col. ; 4 3/4 in.  Mathematics basic arithmetic; arithmetic series 2 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>VCD 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subtraction<br/>Arithmetic
<br/><br/><label>LC Class. No.: </label>513.212 L47 c1993