Hartley, William <br/><br/>
Quick mental maths : mental recall practice for 7 year olds 
William Hartley 
 - New York  Scholastic  1999 
 - 48 p. : ill. ; 30 cm 
<br/><br/><label>ISBN: </label>9780590539197 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Primary Mathametics
<br/><br/><label>Dewey Class. No.: </label>372.7 HAR