Sim, Janet.  <br/><br/>
Lower block challenging science :  based on the latest MOE primary science syllabus / 
Janet Sim. 
 - Fourth edition. 
 - 298 pages :  illustrations ;  26 cm. 
<br/><br/>  Includes answers. "Revised edition." 
<br/><br/> Grade School   
<br/><br/><label>ISBN: </label>9789814574693 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science -- Problems, exercises, etc.     <br/>Science -- Study and teaching (Primary) -- Singapore. 
<br/><br/><label>Dewey Class. No.: </label>372.35/Si41