Midthun, Joseph <br/><br/>
Subtraction 
/ written by Joseph Midthun ; illustrated by Samuel Hiti 
 - 40 pages :  color illustrations 
 - Building blocks of math .
<br/><br/> "Includes online access to activities."--Cover.  Includes index. 
<br/><br/>What is subtraction? Counting back Number lines Checking you work Losing your marbles An unknown change Training your self to substract Subtraction and addition Timeline Who's who : Ada Lovelace Activity : make your own abacus Can you believe it? Subtraction facts 
<br/><br/><label>ISBN: </label>9780716644538 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Comic Books, strips, etc.--Juvenile literature<br/>Subtraction--Comic Books, strips, etc.--Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>510