TY  - BOOK
AU  - Ashlock,Robert B.
TI  - Error patterns in computation: using error patterns to help each student learn 
SN  - 9780135009109
AV  - QA135 
PY  - 2010///
CY  - Boston
PB  - Allyn and Bacon
KW  - Arithmetic
KW  - Study and teaching (Elementary)
N1  - 1 (pages 234-244); 2
ER  -