Lock, Norman D. <br/><br/>
Essential number skills :  activity book / 
Norman D.Lock; illustrated by Andrew Warrington. 
 -  Ladybird,  1997. 
 - 24 p. :  ill. ;  28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Numeration--Juvenile literature
<br/><br/><label>LC Class. No.: </label>JUV 01527