Clements, M. A. <br/><br/>
Careless errors made by sixth-grade children on written mathematical tasks / 
M.A. (Ken) Clements. 
 - Lae :  Mathematics Education Centre, Papua New Guinea University of Technology,  1980. 
 - 11 p. :  30 cm. 
 - Report  no. 14 .
<br/><br/>Bibliography : p.10-11 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Study and teaching (Elementary)<br/>Mathematics--Study and teaching (Elementary)--Error analysis