Number patterns and number machines 

 - 1st ed 
 - Cambridge  Cambridge University Press  1993 
 - 16 p. : ill 
<br/><br/><label>ISBN: </label>9780521447140 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>510 NUM