The World book of math power. 

 - Chicago :  World Book Encyclopedia,  c1983. 
 - 2 v. (800 p.) :  ill. ;  25 cm. 
<br/><br/> Includes bibliography: v. 2, p. 764-766.  index. 
<br/><br/>v. 1. Math skills builder -- v. 2. Everyday math. 
<br/><br/><label>ISBN: </label>0716631601 (set) 
<br/><br/><label>LCCN: </label>82051271  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics.
<br/><br/><label>LC Class. No.: </label>QA39.2  / .W67 1983 
<br/><br/><label>Dewey Class. No.: </label>513/.14