Ashlock, Robert <br/><br/>
Error Pattern in Computation:  Using Error Patterns to Improve Instruction/ 
Robert, Ashlock 
 - 8th ed, 
<br/><br/> College of Education  Bachelor of Secondary Education major in Mathematics 
<br/><br/><label>ISBN: </label>0130270938 
<br/><br/><label>Dewey Class. No.: </label>513.071 As32