TY  - BOOK
AU  - Ashlock,Robert B.
TI  - Error patterns in computation: using error patterns to improve instruction 
SN  - 0131198866
PY  - 2006///
CY  - Upper Saddle River, NJ
PB  - Pearson Prentice Hall
KW  - Arithmetic
KW  - Study and teaching (Elementary)
ER  -