Mathematics in action / 
Alan R. Hopper [and others] 
 - x, 422 pages :  color illustrations ;  31 cm 
<br/><br/> Primary 
<br/><br/><label>ISBN: </label>0021090025 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics<br/>Mathematical recreations<br/>Number games<br/>Puzzles
<br/><br/><label>Dewey Class. No.: </label>510